Yep. Maybe because I already know a fair amount about the subject, but I thought it was pretty lightweight. Tried to put myself in the place of a high schooler (of which I am the parent of one) and I think they would've been bored too. I wonder who the intended audience is?
i'm on the practical end here; i build them. when you make a retaining wall you would increase the length of the L leg with increasing the height of the wall (as said) ALSO you make the L leg thicker both of these will counter the tendency for overturning or collapse of the wall. if the wall is over 6' we normally will have some footing extend past the vertical part of the wall (like a upside down T)this moves the tipping point 'Q' further from the vertical leg and increasing the stability of the wall
@@freeaudiobooks7469 is having a joke with us. He is parodying Donald Trump in the election debates : after a long detailed reply by his opponent Trump would lean in to his microphone and say "Wrong". It was quite funny. However it is not a suitable repost to a well informed comment about engineering.
@@RTYB yes you will. In this example, it's clear. An invert t-shape is MUCH harder to overturn. Just try it yourself and see. And I'm only talking about this model, not real world construction, obviously. That may or may not work in the real world (different materials, etc.)
@@visualstudiosproductions Sure, it does. It shifts the toe further from the weight, making the moment arm longer, does opposing the overturning moment (called righting moment). But, if you had to add that piece of wood, it is better to just put it on the other side, extending the length of the horizontal leg. The results are better, I did the math.
possibly! XD it would just slide like shown earlier- kinda pointless to see exactly when that is when your goal is to build a functional retaining wall
I love the Engineering behind all structures. From basic engineering to the extreme complex engineering. I lose track when it gets Into deep equations, I get a lot better understanding by watching videos than trying to read the equations. Thanks, keep going with even more in depth videos.
As a designer of bespoke rental properties, I love these videos. We always wonder these types of questions when building and just end up testing both to see which ones better over the long haul. In these videos, you do the research for us. Thank you so much!
So you guys are busy building and every now and then you're natural curiosity ends up demolishing another construction site? Are you on fixed salary or piece rate?
I can feel the urge to know more about retaining walls growing inside me by the minute! Don’t you ever starve the mind of a professional procrastinator!
GREAT SCOTT!!! how in this world have I found this channel ONLY TODAY??? Thank you for your precious content. This is PRECIOUS!!! Greetings from Portugal.
I love this video. In my engineering class, our lecturer explained this so badly. The class was pissed off by the confusion. This video is visual imagery of models made it explain clear. Awesome.
@Syd G I had structure lessons during my studies and I saw all of this but never illustrated like this .. I think I would have done better in my exams with illustrations of statics like this. This kind of video should be shown in university.
@Syd G I mean it's basic statics... I'm sure it'd be a waste of time to spend any amount of time on retaining walls if you already know how to calculate allowable and actual moments.
I am a beach bum, but this kind of video still releases dopamine and keeps me from thinking of the meaninlessness of life and suffering for a minute or two. Plus it's way cheaper than heroin.
Brought back the final paper of my soils engineering elements vividly to mind. Selected all three of the values from the Terzaghi curve from the bottom line (engineers will understand this) and proudly announce the retaining wall was going to fail in overturning. It didn't, I did, along with two other students who made the same mistake. In the pub afterwards our lecturer, who had been walking the room invigilating, said he'd spotted what we'd done but couldn't say anything. We were allowed to resit the paper and move on.
It’s a Sunday morning...I’m not a landscaper or engineer and here I am glued to my screen on the edge of my seat watching a video on the physics of a retaining wall.
This is the type of video that excites others to get into structural engineering. I know nothing about it but would have loved to learn it and practice it.
Have I really gotten through so much of the entertaining content on TH-cam that I'm now watching retaining wall videos just to pass the time? I guess so... huh
If you think about it, a LOT of civil engineering principles are obvious through simple logic. For the math to really stuck in the mind, we had to fully grasp every aspect of this simple logic. You'll be surprised by how many huge and complicated structures are backed up with REALLY simple logic even for kids. Don't underestimate these explanations, because these can change a civil engineering student's semester.
@@seriyooow310 I completely get that, I just thought making a video about this and showing such a simple concept that I think anyone should understand immediately is useless. Especially since at the end they don't want to go further with the explanations of different walls because "we don't have time"?
Liked, Subscribed and Commented... I was searching for a video that would help me visualize and understand retaining walls, I suppose a genie nearby was listening and granted me my wish. Amazing Video Keep it up !!
I've built a few retaining (gravity) walls in my time but I'm finding it more and more difficult to find enough marbles for back-filling. They come out through the 'weeps' in the wall too. Could you suggest an alternative?
I always heard about a "heel and foot" in building a wall footing, where the the load side is the "foot" and a short "heel" also extends away from the load side -- like an upside-down T but with one short leg. It is more concrete of course -- but is that design preferable?
Nice video to use an inverted wall you have to check if the soil pressures are under the allowable limits this type of retaining wall has problems with compression of soil failure.
What if there is no room for a heel because of the hill? and I need a wall about 3.5 to 4 meters high to get to the ground level. Any ideas? Thank you so much!
What about a T shaped wall? Will the horizontal bit be shorter than for an L to withhold the same pressure? Or a cross.. so the sum of three lower bits vs one of L?
yes but how does the outward bend preform when partially buried? the models you display only show surface performance. i bet the outward bend would perform better in keeping the wall leveled even trough it technically may not bear a greater load
Most landscape retaining walls fail at the top. The weight of the blocks on top helps keep the bottom ones in place, but as you go up, that weight reduces. So while the lateral pressure is greatest at the bottom, the place on the wall where the lateral pressure exceeds gravity is closer to the top.
If you think of things in vectors everything gets super simple. Idk why but that’s how I think of every force in life and it makes understanding certain things really easy, it also makes other things harder to understand. I fly a lot and thinking of things in terms of vectors makes understanding my maneuvers a lot easier. You just got to imagine thousands of vectors across each wing while you’re flying and in doing so you almost feel like you, the plane, and the air around you are one system, because you are, and you can easily keep yourself from dangerous situations. You can do this with cars as well but it gets a lot harder since there’s four cylindrical contact patches that keep you in control. Vectors make understanding forces like lift, friction, torque, and all other subcategories of those forces like drag and horse power, which is really a function of torque, easier. I recommend trying to understand certain parts of life in this way and maybe take a free physics course at a college. If you’re wondering you can take a free college class at any college. The catch is that you won’t get credits or a degree from it. I got lucky and was able to take college physics for free and get the credit through my high school when I was 15 but not everyone is that lucky. For everyday life just understanding simple physics is great it’s just something each persons who wants to learn needs to make time for.
When we put a retaining wall over 30 years ago, our engineer designed it with a “toe”. It is similar to the upside down T, but the amount of the base is significantly longer underneath the dirt. If I understood him correctly when he explained it to me, the L shape would tip over relatively easily. By putting a “toe” on it, the wall can’t tip over by simply pivoting. Instead the toe would mean that the base underneath the piled dirt would have to lift upwards rather the simply pivot, meaning it could hold back much more dirt than a simple L shaped wall…
yes. the extension in the other direction would extend the moment arm to resist the overturning. this idiot's model assumes that the footer of the wall is at grade... not below frost depth.. and is invalid.
The second the demo wall cracks, the strength to resist overturn is greatly diminished. Even better, even stronger is to add a Buttress wall, a vertical wall poured perpendicular to the main wall and anchored into the footing a nd integrally reinforced with rebar. I know. I repair failed overturned foundations all day. The buttress works.
@ Sydney Vincent I backfill with drain tile at the base of the wall with 18”min. of gravel and protected with drain fabric. Then I compact the original clay as fill. My footing extends 6’ sq. at the buttress location too. As a result I get a full 6’ of downward force to hold back the wall. They NEVER FAIL.
Run a dead man footing and wall on load side the wall 2/3 the full height wall and extending back 2 x plus the height horizontally every 12 to 16 feet and the wall will.stand for a long long time
greg green Two years is not a long time. I put $5000 worth of dead man anchors in a bucket and hauled away that scrap steel. In two years the dead men let the wall move inward three inches. Two years is NOT a long time. That was 25 years ago. Those walls were pushed plumb,and Buttressed. Today they still plumb and dry and crack free.
When the marble depth reached 8 cm in the second example, I realised that not only is the load pushing in a horizontal direction, but also vertically, which was providing a static anchor and greater stability. With soil, gravel or crushed rock, the effect would only be magnified. Mind...blown.
East Germany used this technique to keep cars from being able to ram through the Berlin Wall. If a car hit the L shaped wall the front wheels on the lip would prevent the wall from toppling. They adopted this design after Wolfgang Engels stole an armored personnel carrier, rammed it into the wall, and escaped. (The vehicle got caught on the wall, but he managed to get out of the vehicle and some West Germans pulled him through the hole.)
(Timestamp: 2:30) My answer: I went with the "pointing in" wall (right) instead of the left wall at first. My reasoning was that the marble's weight would push down on the wood sticking inwards and leverage the wall to stick upright longer from the extra force. Edit: I was close- I used improper terminology and worded my response weird, but I had the general idea down. I also didn't realize that the downwards pressure would also increase friction! That's a key detail to miss. Close, but not exactly. 3/5.
Nothing against doing further reading but in the meantime... So how *do* they create the additional friction of the rubber mat in real life? I will not have closure until I know.
face the base into the hill. the soil weight and pressure behind the wall -- hitting the base -- will help retain itself. .. even better, make the wall an upside-down T .. build the base below the final lower grade .. lean the wall into the hill .. use keys (interlocking groove) between the foundation and the vertical wall (and within the wall structure) .. place anchors back into hillside (deadmen or geotextile)
The pins and geotextile is true for modular or segmented unit wall construction, but not for cast in place or pre-cast concrete. CIP walls should always (when possible) use a footing that extends past both vertical faces of the wall (upside down "T"). I design a lot of retaining walls (Architect) and we only use cantilevered walls/footings when we have no other choice. Excavating and back-filling both side of the wall for the footing achieves much greater stability and neutralizes the overturn or tipping issues. Additionally sometimes we place wall footings on concrete piers to a greater depth to further neutralize the threat of sliding.
Back when i did landscaping in high school, i was taught that if you use the L shape, the lower part of the L should be at least 50% the length of the wall proper, and that you should never build a retaining more than 48-50" in height without getting an engineer to design it. You also need to place about 1/3 the height of the wall as seen above the ground, below ground as an anchor. Building one of these for my parent's home this summer actually, though its going to take effort, and a lot of work, due to the nature of the slope, and the fact i cannot use stone as i would prefer as the soil here is...non conducive to stoneworks (the whole reason for the new retaining wall is that the last three stone works walls have lasted less than 2 years each, due to the unique quality of the soil here, being largely clay, with pockets of gravel like stone and dirt.) My plan is to use 10 foot cedar posts, with a diameter of around 6 inches, placed 5 feet apart, as the primary 'footing' and using cedar planks, of 4"x12" as the wall proper, with additional posts placed horizontally, but perpendicular to the wall, and affix them using 10 inch anchoring bolts to the seated posts. This gives me two anchoring mechanisms, which will hopefully prevent another wall collapse.
If the toe is wider with a beam at the toe front and also at the rear ,reo goes through the toe,loops around in the rear footing beam ,then blocks laid over the starter bars,these ar e then extended as the wall rises.along with transverse bars , there is no way the wall can be moved with pressure knock outs at the base run of blocks this allows to check that when the grout fill is added the concrete goes full height of the blocks,weep holes left every second block
Need more videos about cantilever bridge,slab bridge,cable-stayed bridge, Extra dosed bridge mechanism. Also need mechanism of cantilever retaining wall and other types of retaining wall.
I get you. It would've been great if videos like these existed back when I was still in college instead of another lecture from an indian (which I'm still thankful to, it's just that it's full of math instead of simple logic).
Start with a base row block buried below grade. Put a corrugated sock pipe behind base row out both ends of wall as relief pipe. Every course up, set block back a 1/4". Proper gravel and dirt compaction behind wall every course important. This applies to residential walls mostly.
This demonstration is illustrative. However the wood is much less dense than the marbles, while concrete is similar in density to soil. This matters because the whole example relies on combined center of gravity vs center of horizontal pressure. (And even that is setting aside material strengths like concrete in compression/tension)
"We don't have time to discuss them here" Do you have something else to do? because I'm open for a longer video.
Time and the world as you know it has come to an end. Was it not your sin trapped the unicorn?
Syd G sounds scary, but I’m in the tire recycling business and up for a challenge! 😂
He had a retaining wall to build. He had to go!
Yep. Maybe because I already know a fair amount about the subject, but I thought it was pretty lightweight. Tried to put myself in the place of a high schooler (of which I am the parent of one) and I think they would've been bored too.
I wonder who the intended audience is?
lol. That's what I'm wondering. Maybe he's in a hurry to get home to his wife before Enrique gets there.
Why yes Mr. Algorithm, I did in fact want to watch this.
ciknay lmao, same thing happened to me.
*You're both welcome.*
Thank you that has made my midnight
Who else is watching at 4am when this was recommended..?
Yeah... scary! Me too!!
I think we can all agree that this is one of the best L shaped retaining wall vids on youtube. None of that H or S or even T shape bullshit here
TATERTOTS JACKSON Sphere-shaped walls are the best if you keep the water inside.
Yes, this videos lacks a bit of practical use.
i'm on the practical end here; i build them.
when you make a retaining wall you would increase the length of the
L leg with increasing the height of the wall (as said) ALSO you make the L leg thicker
both of these will counter the tendency for overturning or collapse of the wall.
if the wall is over 6' we normally will have some footing extend past the vertical
part of the wall (like a upside down T)this moves the tipping point 'Q' further from the vertical leg and increasing the stability of the wall
Wrong
wowiezowiepowie can you tell us about utilizing different/lighter materials between the wall and the land being retained?
Free Audio Books your one word reply speaks volumes of your lack of understanding of the problem.
wowiezowiepowie
cylindrical containment.....
@@freeaudiobooks7469 is having a joke with us.
He is parodying Donald Trump in the election debates :
after a long detailed reply by his opponent Trump would lean in to his microphone and say "Wrong".
It was quite funny.
However it is not a suitable repost to a well informed comment about
engineering.
Make the shape an upsidedown T shape. Checkmate.
That's just a waste of materials. You won't get significantly improved performance.
RTYB its a joke :/
@@RTYB yes you will. In this example, it's clear. An invert t-shape is MUCH harder to overturn. Just try it yourself and see. And I'm only talking about this model, not real world construction, obviously. That may or may not work in the real world (different materials, etc.)
@@visualstudiosproductions Sure, it does. It shifts the toe further from the weight, making the moment arm longer, does opposing the overturning moment (called righting moment). But, if you had to add that piece of wood, it is better to just put it on the other side, extending the length of the horizontal leg. The results are better, I did the math.
It actually have been used in real world.
Am I the only one who wanted to see the L facing the marbles without the additional friction?
possibly! XD
it would just slide like shown earlier- kinda pointless to see exactly when that is when your goal is to build a functional retaining wall
There's no time for that here.
it will slide too
@@AndreasChristianto Yeah, I was just hoping for a direct comparison but they included the friction pad which ruined it
@@rogerscottcathey lmao 🤣🤣😂
I love the Engineering behind all structures. From basic engineering to the extreme complex engineering.
I lose track when it gets Into deep equations, I get a lot better understanding by watching videos than trying to read the equations.
Thanks, keep going with even more in depth videos.
This channel randomly appeared on my feed. And I’m glad it did!
As a designer of bespoke rental properties, I love these videos. We always wonder these types of questions when building and just end up testing both to see which ones better over the long haul. In these videos, you do the research for us. Thank you so much!
So you guys are busy building and every now and then you're natural curiosity ends up demolishing another construction site?
Are you on fixed salary or piece rate?
@Swat Are you really a "property designer" who finds engineering solutions via simplistic marbles and plywood videos? Do you work for your dad?
@@waynebrinker8095 what's wrong with working for his dad?
You should hire an engineer. These are not just research, these are established principles that we have studied and every engineer should know.
I can feel the urge to know more about retaining walls growing inside me by the minute! Don’t you ever starve the mind of a professional procrastinator!
Where has this channel been all my life? Awesome!
GREAT SCOTT!!! how in this world have I found this channel ONLY TODAY???
Thank you for your precious content. This is PRECIOUS!!!
Greetings from Portugal.
Oh wow this was one of the best videos on retaining walls.
I love this video. In my engineering class, our lecturer explained this so badly. The class was pissed off by the confusion. This video is visual imagery of models made it explain clear. Awesome.
*Clever engineering* that helps to build our infrastructure.
A lot of nice and honest work in this industry.
You will make common man with good civil engineering aptitude. God bless
Can anyone point me to a video about retaining walls that DOES go in to depth about the subject of retaining walls?
There are lots of them, but in lecture style. These are helpful during college days.
Try practical engineering
Dont think he has a video specifically about this but he does a good job explaining engineering stuff in a fun way
A fluid mechanics book will help. Look up forces on submerged surfaces
I do not have time here to send you a link of such a video... haha
Design of concrete structures 13 th edition by Nilson
I am an architect and I really love your videos! Good job keep it up :)
@Syd G I had structure lessons during my studies and I saw all of this but never illustrated like this .. I think I would have done better in my exams with illustrations of statics like this. This kind of video should be shown in university.
@Syd G I mean it's basic statics... I'm sure it'd be a waste of time to spend any amount of time on retaining walls if you already know how to calculate allowable and actual moments.
I am a beach bum, but this kind of video still releases dopamine and keeps me from thinking of the meaninlessness of life and suffering for a minute or two. Plus it's way cheaper than heroin.
where have I been for the past 3 years - thank you, good work
Brought back the final paper of my soils engineering elements vividly to mind.
Selected all three of the values from the Terzaghi curve from the bottom line (engineers will understand this) and proudly announce the retaining wall was going to fail in overturning.
It didn't, I did, along with two other students who made the same mistake.
In the pub afterwards our lecturer, who had been walking the room invigilating, said he'd spotted what we'd done but couldn't say anything.
We were allowed to resit the paper and move on.
Don't know why this channel stopped posting, videos are good, easily understandable
It’s a Sunday morning...I’m not a landscaper or engineer and here I am glued to my screen on the edge of my seat watching a video on the physics of a retaining wall.
After a strong diet of memes and funny videos, the algorithm still was able to figure out I'm in fact an Engineer
This was the first video of yours I have watched. It was great 👍. The binge begins
As my MIL's family would say, "Oh mine too." Glad to have found this channel. :o)
Same I loved it! The kind of casual education in engineering I need!
I am persueing engineering and I am glad that I chose the ryt option in the beginning itself !
Realizations are something which keeps you motivated!
this channel is extremely underrated, should have a million subs.
This is the type of video that excites others to get into structural engineering. I know nothing about it but would have loved to learn it and practice it.
Супер, дуже доступно і наглядно. Велика вдячніть. Підписавсь, буду спостерігати за вами.
Have I really gotten through so much of the entertaining content on TH-cam that I'm now watching retaining wall videos just to pass the time? I guess so... huh
I'm not engineer but this was so damn obvious and logical
It pissed me off bc i felt like I was watching a vid for a 4 year old
If you think about it, a LOT of civil engineering principles are obvious through simple logic. For the math to really stuck in the mind, we had to fully grasp every aspect of this simple logic. You'll be surprised by how many huge and complicated structures are backed up with REALLY simple logic even for kids. Don't underestimate these explanations, because these can change a civil engineering student's semester.
@@seriyooow310 I completely get that, I just thought making a video about this and showing such a simple concept that I think anyone should understand immediately is useless. Especially since at the end they don't want to go further with the explanations of different walls because "we don't have time"?
r/iamverysmart
The best solution to a problem is usually the simplest one
OK first of all why am I here and why am I watching this at 5 in the morning
I have often asked myself the very same question, although as often as not, cute baby animals were involved.
You never know when you you have to build a retaining wall. Better be prepared:p
im here 2:05 in the morning
Liked, Subscribed and Commented... I was searching for a video that would help me visualize and understand retaining walls, I suppose a genie nearby was listening and granted me my wish. Amazing Video Keep it up !!
Dude you are awesome. Its so easy much easy understand the engineering concepts. Thank you for your effort.
Thank you......The video was very much usefull and simple
Really interesting and artistic way of getting the point across!
Good job mate..
I've built a few retaining (gravity) walls in my time but I'm finding it more and more difficult to find enough marbles for back-filling. They come out through the 'weeps' in the wall too. Could you suggest an alternative?
I always heard about a "heel and foot" in building a wall footing, where the the load side is the "foot" and a short "heel" also extends away from the load side -- like an upside-down T but with one short leg. It is more concrete of course -- but is that design preferable?
You should link the extra videos in the description. Makes them easier to find and follow.
Awesome video! I wish I had these videos during college
I support this channel. Please do engineering model on retaining wall with counterfort model.
Nice video to use an inverted wall you have to check if the soil pressures are under the allowable limits this type of retaining wall has problems with compression of soil failure.
What if there is no room for a heel because of the hill? and I need a wall about 3.5 to 4 meters high to get to the ground level. Any ideas? Thank you so much!
Very useful in determining how I'm going to construct a retaining wall on my own property. Thank you!
Why you guys stopped uploading content...it is so good and you have good success too with this TH-cam channel.
THANKS GREAT VIDEO YOU TEACH US IN A SIMPLE AND PRACTICE WAY.
What about a T shaped wall? Will the horizontal bit be shorter than for an L to withhold the same pressure? Or a cross.. so the sum of three lower bits vs one of L?
This is some fine stuff right here, mate
Thanks you. This is very helpful. Keep up the good work.
John Rex Alegria it’s thank you with no (s) on thanks you ........
I love this explanation, great examples 👌
This is what i was looking for. Thanks sir
Great video.... I would love to see more retaining wall models... like gabion wall, buttress wall etc.
yes but how does the outward bend preform when partially buried? the models you display only show surface performance. i bet the outward bend would perform better in keeping the wall leveled even trough it technically may not bear a greater load
Great explanation of how the forces acting on a retaining wall work under 5 minutes.
Thank you so much!
Your videos are GREAT!!!
Finally, the youtube algorithm brought me to something I really want to watch
this series is very useful. thanks
I'm so happy I found this channel!
Yes, we have the time! And we will be discussing them here!!!
That is so cool. It is the same principle with many bookend models.
Does water pressure exert on retaining wall constructed along the river?
Damn I wish schools were teaching like this!
It's very useful information for me!
Thank you TH-cam!! -__-
Most landscape retaining walls fail at the top. The weight of the blocks on top helps keep the bottom ones in place, but as you go up, that weight reduces. So while the lateral pressure is greatest at the bottom, the place on the wall where the lateral pressure exceeds gravity is closer to the top.
thats where terraces come into play (i think) lol
That would explain what's happening to my dry stone retaining wall. Thanks.
If you think of things in vectors everything gets super simple. Idk why but that’s how I think of every force in life and it makes understanding certain things really easy, it also makes other things harder to understand. I fly a lot and thinking of things in terms of vectors makes understanding my maneuvers a lot easier. You just got to imagine thousands of vectors across each wing while you’re flying and in doing so you almost feel like you, the plane, and the air around you are one system, because you are, and you can easily keep yourself from dangerous situations. You can do this with cars as well but it gets a lot harder since there’s four cylindrical contact patches that keep you in control. Vectors make understanding forces like lift, friction, torque, and all other subcategories of those forces like drag and horse power, which is really a function of torque, easier. I recommend trying to understand certain parts of life in this way and maybe take a free physics course at a college. If you’re wondering you can take a free college class at any college. The catch is that you won’t get credits or a degree from it. I got lucky and was able to take college physics for free and get the credit through my high school when I was 15 but not everyone is that lucky. For everyday life just understanding simple physics is great it’s just something each persons who wants to learn needs to make time for.
When we put a retaining wall over 30 years ago, our engineer designed it with a “toe”. It is similar to the upside down T, but the amount of the base is significantly longer underneath the dirt. If I understood him correctly when he explained it to me, the L shape would tip over relatively easily. By putting a “toe” on it, the wall can’t tip over by simply pivoting. Instead the toe would mean that the base underneath the piled dirt would have to lift upwards rather the simply pivot, meaning it could hold back much more dirt than a simple L shaped wall…
yes. the extension in the other direction would extend the moment arm to resist the overturning.
this idiot's model assumes that the footer of the wall is at grade... not below frost depth.. and is invalid.
Hey that was simple and cool! What about the best of both worlds, an inverted T retaining wall?
The second the demo wall cracks, the strength to resist overturn is greatly diminished.
Even better, even stronger is to add a Buttress wall, a vertical wall poured perpendicular to the main wall and anchored into the footing a nd integrally reinforced with rebar.
I know. I repair failed overturned foundations all day. The buttress works.
Burn Notice what fill material do you use in the void
@ Sydney Vincent
I backfill with drain tile at the base of the wall with 18”min. of gravel and protected with drain fabric. Then I compact the original clay as fill.
My footing extends 6’ sq. at the buttress location too.
As a result I get a full 6’ of downward force to hold back the wall.
They NEVER FAIL.
Run a dead man footing and wall on load side the wall 2/3 the full height wall and extending back 2 x plus the height horizontally every 12 to 16 feet and the wall will.stand for a long long time
greg green
Two years is not a long time.
I put $5000 worth of dead man anchors in a bucket and hauled away that scrap steel. In two years the dead men let the wall move inward three inches.
Two years is NOT a long time.
That was 25 years ago. Those walls were pushed plumb,and Buttressed. Today they still plumb and dry and crack free.
@@Burn269 do you extend the buttress walls toward the load or away from the load? How long and how frequent are the buttresses?
Thanks for making this video which is so useful
When the marble depth reached 8 cm in the second example, I realised that not only is the load pushing in a horizontal direction, but also vertically, which was providing a static anchor and greater stability. With soil, gravel or crushed rock, the effect would only be magnified. Mind...blown.
bruh
@@hazza2247 Yeah, I've read an engineering book or two.
So fresh and nice when the algorithm suggests something like this. Thank you!
A T footing would require more leverage to overturn and provide an increase in friction capabilities. Excellent point!
We are just scratching the surface here but great video. Engineering is fantastic
Interesting, but it should be called retaining wall if you are only going to discuss one type. I wanted to hear about the others as well.
Eh? The title *is* "Retaining Walls". (Unless it's been renamed.)
@@RonJohn63 wall singular not walls plural
Very carefully made video. Thank you!
East Germany used this technique to keep cars from being able to ram through the Berlin Wall. If a car hit the L shaped wall the front wheels on the lip would prevent the wall from toppling. They adopted this design after Wolfgang Engels stole an armored personnel carrier, rammed it into the wall, and escaped. (The vehicle got caught on the wall, but he managed to get out of the vehicle and some West Germans pulled him through the hole.)
VERY INFORMATIVE AND CONCEPTUAL
Who disliked this video? Angry soil? "Damn engineers always keeping us from tipping over walls!"
Those who couldn't answer the question downvoted.
Do you have one on roof slabs, depth of concrete and span?
First time watching!
Hooked!
(Timestamp: 2:30) My answer: I went with the "pointing in" wall (right) instead of the left wall at first. My reasoning was that the marble's weight would push down on the wood sticking inwards and leverage the wall to stick upright longer from the extra force.
Edit: I was close- I used improper terminology and worded my response weird, but I had the general idea down. I also didn't realize that the downwards pressure would also increase friction! That's a key detail to miss. Close, but not exactly. 3/5.
Nothing against doing further reading but in the meantime...
So how *do* they create the additional friction of the rubber mat in real life?
I will not have closure until I know.
face the base into the hill. the soil weight and pressure behind the wall -- hitting the base -- will help retain itself.
.. even better, make the wall an upside-down T .. build the base below the final lower grade .. lean the wall into the hill .. use keys (interlocking groove) between the foundation and the vertical wall (and within the wall structure) .. place anchors back into hillside (deadmen or geotextile)
The pins and geotextile is true for modular or segmented unit wall construction, but not for cast in place or pre-cast concrete. CIP walls should always (when possible) use a footing that extends past both vertical faces of the wall (upside down "T"). I design a lot of retaining walls (Architect) and we only use cantilevered walls/footings when we have no other choice. Excavating and back-filling both side of the wall for the footing achieves much greater stability and neutralizes the overturn or tipping issues.
Additionally sometimes we place wall footings on concrete piers to a greater depth to further neutralize the threat of sliding.
So creative explaination👍👍
interesting.... Dead man Wall also a good design for retain pressure.
Geogrid mat is more easily incorporated between courses and material doesn't degrade
Simple and informative. Subscribed.
Certainly helps with my construction management subjects 🤣thank you TH-cam recommendation
What to know more about such ingenious approaches? check here: 4:04
Best u tube channel
I'm convinced it's a major contribution to road safety
Step by step video solutions of civil engineering questions
Can I use certain portion of the clips in my video describing retain walls in my native language?
Back when i did landscaping in high school, i was taught that if you use the L shape, the lower part of the L should be at least 50% the length of the wall proper, and that you should never build a retaining more than 48-50" in height without getting an engineer to design it.
You also need to place about 1/3 the height of the wall as seen above the ground, below ground as an anchor.
Building one of these for my parent's home this summer actually, though its going to take effort, and a lot of work, due to the nature of the slope, and the fact i cannot use stone as i would prefer as the soil here is...non conducive to stoneworks (the whole reason for the new retaining wall is that the last three stone works walls have lasted less than 2 years each, due to the unique quality of the soil here, being largely clay, with pockets of gravel like stone and dirt.)
My plan is to use 10 foot cedar posts, with a diameter of around 6 inches, placed 5 feet apart, as the primary 'footing' and using cedar planks, of 4"x12" as the wall proper, with additional posts placed horizontally, but perpendicular to the wall, and affix them using 10 inch anchoring bolts to the seated posts.
This gives me two anchoring mechanisms, which will hopefully prevent another wall collapse.
If the toe is wider with a beam at the toe front and also at the rear ,reo goes through the toe,loops around in the rear footing beam ,then blocks laid over the starter bars,these ar e then extended as the wall rises.along with transverse bars , there is no way the wall can be moved with pressure
knock outs at the base run of blocks this allows to check that when the grout fill is added the concrete goes full height of the blocks,weep holes left every second block
Need more videos about cantilever bridge,slab bridge,cable-stayed bridge, Extra dosed bridge mechanism. Also need mechanism of cantilever retaining wall and other types of retaining wall.
I get you. It would've been great if videos like these existed back when I was still in college instead of another lecture from an indian (which I'm still thankful to, it's just that it's full of math instead of simple logic).
Most useful resource I could find so far!
Start with a base row block buried below grade. Put a corrugated sock pipe behind base row out both ends of wall as relief pipe. Every course up, set block back a 1/4". Proper gravel and dirt compaction behind wall every course important. This applies to residential walls mostly.
Oh thanks for saying that mate,,,, I couldn't take much more of this video..
You a bricky or a mason..
I dunno why youtube recommended me this vid, but I enjoyed it :)
Can someone suggest me some great channels like this one for civil engineering.
Practical engineering
This demonstration is illustrative. However the wood is much less dense than the marbles, while concrete is similar in density to soil.
This matters because the whole example relies on combined center of gravity vs center of horizontal pressure. (And even that is setting aside material strengths like concrete in compression/tension)
Good illustration