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

Table 4

The variation of mechanical parameters with weathering time in direct shear tests.

Weathering time (days)	Test conditions	Compressive load (kN)	Compressive stress (MPa)	Shear load (kN)	Shear strength (MPa)	Internal friction angle	Cohesion (MPa)	Friction coefficient
0	Condition 1-1	10	5.72	14.84	8.48	42.22	3.28	0.91
	Condition 1-2	15	8.59	19.28	11.05
	Condition 1-3	20	11.31	23.98	13.56
	Condition 1-4	25	14.06	26.71	16.14
7	Condition 2-1	10	5.73	11.84	6.78	42.92	1.60	0.99
	Condition 2-2	15	8.57	17.9	10.22
	Condition 2-3	20	11.42	19.86	11.34
	Condition 2-4	25	14.11	26.76	15.10
14	Condition 3-1	10	5.72	9.96	5.70	40.02	1.07	0.84
	Condition 3-2	15	8.48	15.07	8.52
	Condition 3-3	20	11.24	18.44	10.36
	Condition 3-4	25	14.11	22.96	12.90
21	Condition 4-1	10	5.72	8.87	4.99	40.02	0.67	0.78
	Condition 4-2	15	8.48	13.57	7.63
	Condition 4-3	20	11.24	16.74	9.41
	Condition 4-4	25	14.11	20.82	11.7
28	Condition 5-1	10	5.72	7.98	4.49	40.02	0.38	0.74
	Condition 5-2	15	8.48	12.12	6.81
	Condition 5-3	20	11.23	15.36	8.63
	Condition 5-4	25	14.11	19.10	10.73