Geology Reference
In-Depth Information
Figure B5-2.1 Failure plane with debris cleared off.
800
100
700
500
0
100
200
Low stress data
500
400
300
Iron oxide-coated joints
Corrected data
YKS 1,4,6,7,11,12
200
Chlorite-coated joints
Corrected data
YKS 2,3,8,9
100
Saw-cut
0
100
200
300
Dilation - corrected normal stress,
400
500
600
700
800
900
1,000
1,100
σ
i
kPa
-
both matching discontinuities and mismatched. It was noted that some blocks were coated with red iron
oxides and others with green chlorite (a hard, thin coating). Each sample was carefully described and then
tested multi-stage in a Golder Associates direct shear box. At each stage, the test proceeded until peak
strength was reached and then for another mm or two, following which the normal stress was increased,
Because of the low angle of sliding, it was decided to investigate in some detail. Blocks were collected
