Effect of Hydrothermal Coupling on Physical and Dynamic Mechanical Properties of Sandstone

Table 3

Test results on damage of sandstone after H-C cycles.

Test number	Number of sample groups	Cycling number	Dp	Dσ	θp (MPa)	θσ (MPa)
1	Room temperature	0	0	0	0.356	0.356
2	Low temperature (L-T) group	10	0.091	0.025	0.461	0.400
3		20	0.152	0.160	0.508	0.518
4		30	0.160	0.238	0.439	0.533
5		40	0.184	0.275	0.426	0.539
6	Moderate temperature (M-T) group	10	0.087	0.137	0.409	0.458
7		20	0.217	0.268	0.588	0.673
8		30	0.263	0.316	0.570	0.662
9		40	0.285	0.327	0.803	0.906
10	High temperature (H-T) group	4	0.653	0.550	1.089	0.648
11		8	0.751	0.641	2.48	1.193
12		12	0.775	0.706	2.654	1.554