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

Table 3

The variation of mechanical parameters with weathering time under the uniaxial compression conditions.

Weathering time (days)	Test case	Uniaxial compression strength (MPa)	Mean value (MPa)	Standard deviation (MPa)	Relative standard deviation (%)	Elastic modulus (GPa)	Poisson’s ratio
0	Case 1-1	61.15	66.48	4.21	6.33	13.29	0.160
	Case 1-2	65.49
	Case 1-3	72.80
7	Case 2-1	36.42	39.51	2.06	5.21	4.70	0.295
	Case 2-2	39.79
	Case 2-3	42.32
14	Case 3-1	20.98	24.25	2.18	8.99	4.34	0.339
	Case 3-2	24.89
	Case 3-3	26.88
21	Case 4-1	13.52	15.29	1.18	7.72	3.92	0.379
	Case 4-2	17.03
	Case 4-3	4.33
28	Case 5-1	8.87	10.09	0.81	8.03	3.55	0.408
	Case 5-2	10.13
	Case 5-3	11.27