How to Perform Discontinuity (Joint) Survey of Rock Mass | Scanline Method

This video explains how to conduct a scanline survey of discontinuities (joints) in rock mass. The major joint characteristics include spacing, persistence, aperture (see the table below that we use to classify rock mass characteristics). The spacing is used to classify rock mass (This video is on rock mass rating • Rock Mass Rating (RMR)... ). To learn how to measure dip and dip direction, watch this video • How to Measure Dip and... , to learn how to plot dip and dip direction using a stereonet, watch this video • How To Draw Stereonet:... . To know how to estimate rock surface roughness, watch this video • Easy Way To Measure Ro...
Joint spacing
Description Joint spacing (m)
Extremely close spacing less 0.02
Very close spacing 0.02-0.06
Close spacing 0.06-0.2
Moderate spacing 0.2-0.6
Wide spacing 0.6-2
Very wide spacing 2-6
Extremely wide spacing greater 6
Joint persistence
Description Trace length (m)
Very low persistence less than 1
Low persistence 1-3
Medium persistence 3-10
High persistence 10-20
Very high persistence greater than 20
Aperture
Aperture (mm) Description
less than 0.1 Very tight Closed features
0.1-0.25 Tight
0.25-0.5 Partly open
0.5-2.5 Open Gapped features
2.5-10 Moderately wide
greater than 10 Wide
10-100 Very wide Open features
100-1000 Extremely wide
greater than 1000 Cavernous
Related videos:
How To Estimate RQD using Joint Count, Joint Spacing, and Joint Frequency | Problems and Solutions • How To Estimate RQD us...
How to Identify Bedding Planes and Sets of Discontinuities in the Field? • Video
How to Perform Discontinuity (Joint) Survey of Rock Mass | Scanline Method • How to Perform Discont...
How To Measure Rock Quality Designation Index (RQD) | Procedure and Classification • How To Measure Rock Qu...

[@hichembouzaya224]

Thank you i was looking for it a Long ago

[@haydarirfan5402]

Thankyou very much for the lecture.

[@emmanuelmejia3122]

excellent explanation!!

[@Sultan_Ahmed1]

Thank you

[@mye-mail3098]

Thanks