Looks like about 165m of tunnel complete (conveyor cassette rise of approx 0.6m since the belt extension at 150m). Looking like about 10m per day at the moment. Loaded ventilation cassette prepared (White tube with yellow vent duct inside). Assuming the vent duct is 100m lengths, and it needs to extend about 10m onto the Backup, with 5m outside the tunnel. That means 85m in the tunnel plus 95m of TBM. So when the new vent cassette goes in they should be about 180m of completed tunnel. I would expect to see it installed on Friday. Utility extension pipes being taken in on top of the loaded segment cars. Tunnel spoil is still very wet, difficult to transport.
Good video. Glad you focused on the tunneling process. It seems that they stop the tunneling process (as evidenced by the stoppage of conveyor belt) when they are installing the walls. Would love to see it emerge ti the other end. Where?
Tunnel spoil is too wet (liquid) to transport in those site trucks, it will spill everywhere. Need to mix it with dry soil, or, as they are doing, form a dry soil bund at the back of the truck to contain the wet spoil.
@@ThreeNoTrump_100 Good question. I wish the answer was simple. They are excavating below the water table with an Earth Pressure Ballance TBM (EPB). This type of machine maintains the soil and groundwater pressure in the cutterhead chamber, by doing this it can support soft, wet ground in front and above the excavation face. By varying the rate of advance and the rate of soil extraction (through a 10m long screw conveyor) they can control "balance" this pressure with the soil and hydrostatic pressure. Lots of You Tube videos to explain this better than me if you are interested. Plus some academic codes of practice etc to help set the control parameters. (I was the main author on one of them). In this case it seems the ground is wet enough to form the "paste" that the soil needs to be to pass through the screw conveyor. To assist this process the excavation face is injected with a foam lubricant. This is in effect a biodegradable detergent, which helps the mixing and lubrication. Once the spoil "paste" discharges from the inclined screw conveyor, onto the open belt conveyor, it loses some of its "paste" structure an becomes effectively a slurry with lumps in. That is what we see coming out on the conveyor. It can be mechanically dewatered, using a screening plant and hydro cyclones or filter presses. Or, more simply, if you have the space, hauled away, spread out and left to dry. Again, if you are interested, take a look at some TH-cam videos, "EPB TBM" or "Herrenknecht" are a good starting point.
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Looks like about 165m of tunnel complete (conveyor cassette rise of approx 0.6m since the belt extension at 150m). Looking like about 10m per day at the moment.
Loaded ventilation cassette prepared (White tube with yellow vent duct inside). Assuming the vent duct is 100m lengths, and it needs to extend about 10m onto the Backup, with 5m outside the tunnel. That means 85m in the tunnel plus 95m of TBM. So when the new vent cassette goes in they should be about 180m of completed tunnel. I would expect to see it installed on Friday.
Utility extension pipes being taken in on top of the loaded segment cars.
Tunnel spoil is still very wet, difficult to transport.
What are they digging up from the tunnel? It seems like cement slurry.
@@robkeshav800 Just wet clay/sand/gravel soil. They mix some foam detergent with it to lubricate it in the excavation chamber, leaves it a bit wet.
@@tunnellingsalisbury7605 Thank you.
Thank you!
Good video. Glad you focused on the tunneling process. It seems that they stop the tunneling process (as evidenced by the stoppage of conveyor belt) when they are installing the walls. Would love to see it emerge ti the other end. Where?
My question is: why does the content of what's coming out of the tunnel look like concrete?
Comment from David Salisbury answers your question.
Cannot believe how insanely
Loud it is lol 😂😂😂😂😂 wow 😐 👌
how many tunnels will there be? one tunnel sounds like a single point of failure. I think 2 tunnels at least.
Hopefully they made the left turn at Albuquerque! 🙂
Why are they mixing the red dirt that the dump truck brought in with the blackish dirt that’s coming out of the tunnel?
Tunnel spoil is too wet (liquid) to transport in those site trucks, it will spill everywhere. Need to mix it with dry soil, or, as they are doing, form a dry soil bund at the back of the truck to contain the wet spoil.
@@davidsalisbury50 Is the spoil naturally wet or do they use water as part of the tunneling process?
@@ThreeNoTrump_100 Good question. I wish the answer was simple.
They are excavating below the water table with an Earth Pressure Ballance TBM (EPB). This type of machine maintains the soil and groundwater pressure in the cutterhead chamber, by doing this it can support soft, wet ground in front and above the excavation face. By varying the rate of advance and the rate of soil extraction (through a 10m long screw conveyor) they can control "balance" this pressure with the soil and hydrostatic pressure. Lots of You Tube videos to explain this better than me if you are interested. Plus some academic codes of practice etc to help set the control parameters. (I was the main author on one of them).
In this case it seems the ground is wet enough to form the "paste" that the soil needs to be to pass through the screw conveyor. To assist this process the excavation face is injected with a foam lubricant. This is in effect a biodegradable detergent, which helps the mixing and lubrication. Once the spoil "paste" discharges from the inclined screw conveyor, onto the open belt conveyor, it loses some of its "paste" structure an becomes effectively a slurry with lumps in. That is what we see coming out on the conveyor.
It can be mechanically dewatered, using a screening plant and hydro cyclones or filter presses. Or, more simply, if you have the space, hauled away, spread out and left to dry.
Again, if you are interested, take a look at some TH-cam videos, "EPB TBM" or "Herrenknecht" are a good starting point.
Couple of great questions and answers. TH-cam comments at its best.
@@DessieDoolan Most definitely 💯🙂
Why doesn’t he move in closer so we can see real progress 😡
Because this BOZO has not flying skills and really sucks at it! Along with the bullshit sound tracks he lays down in the videos.