Experimental Investigation into the Influences of Weathering on the Mechanical Properties of Sedimentary Rocks

Table 5

The mechanical parameters of rock specimen.

Rock type	Weathering time (days)	Tensile strength (MPa)	Compression strength (MPa)	Elastic modulus (GPa)	Poisson ratio	Internal friction angle	Cohesion (MPa)	Friction coefficient
Black shale	0	9.82	66.48	13.29	0.160	42.22	3.28	0.91
	7	6.91	39.51	7.96	0.295	42.92	1.60	0.99
	14	5.09	24.25	5.47	0.339	40.02	1.07	0.84
	21	4.02	15.29	4.02	0.379	40.02	0.67	0.78
	28	2.98	10.09	3.55	0.408	40.02	0.38	0.74