Shearing Performance of Natural Joints with Different Roughnesses under Direct Shearing Tests

Table 1

Mineralogical composition of the studied sandstone.

Mineral (wt.%)
Quartz	Orthoclase	Albite	Calcite	Dolomite	Pyrite	Chlorite	Illite
13.3	0.3	2.5	14.6	53.9	0.37	3.5	11.5