Mechanical Properties and Statistical Damage Constitutive Model of Rock under a Coupled Chemical-Mechanical Condition

Table 1

Parameters of sandstone under the conditions of different chemical corrosions.

Chemical environment	Confining pressures (MPa)	(mPa)		E (GPa)	Residual strength (MPa)	(%)	(%)	(MPa)	(°)
H2SO4 solution	0	52.45	0.0102	9.19	28.26	5.06	10.76	14.90	30.55	0.28
	5	66.98	0.0108	10.52	38.63	5.12	10.63
	10	83.17	0.0119	11.61	58.59	5.04	10.81
	15	98.18	0.0124	12.15	65.07	5.09	10.77
	20	113.59	0.0135	12.75	74.25	5.10	10.85
	25	128.86	0.0143	12.93	82.78	5.13	10.82
NaOH solution	0	55.74	0.0096	9.41	30.13	5.04	8.65	15.78	31.37	0.26
	5	72.97	0.0104	10.84	41.12	5.03	8.59
	10	87.54	0.0117	11.93	61.49	5.12	8.66
	15	103.75	0.0125	12.18	70.65	5.08	8.57
	20	119.68	0.0134	12.86	82.23	5.14	8.62
	25	135.48	0.0143	13.27	93.81	5.06	8.64
Distilled water	0	63.13	0.0094	10.48	33.96	5.11	5.92	16.68	33.60	0.26
	5	78.95	0.0102	11.37	44.28	5.02	5.90
	10	96.24	0.0122	12.24	64.29	5.09	5.87
	15	114.32	0.0131	12.63	73.04	5.12	5.94
	20	132.52	0.0138	12.95	85.75	4.96	5.84
	25	149.11	0.0149	13.65	97.29	5.06	5.89
Natural state	0	64.63	0.0092	10.83	39.56	5.12	5.12	17.13	34.07	0.25
	5	81.57	0.0101	11.41	65.31	5.06	5.06
	10	100.95	0.0120	12.52	81.37	5.08	5.08
	15	117.75	0.0129	12.94	93.91	5.07	5.07
	20	135.28	0.0139	13.21	102.36	5.11	5.11
	25	153.23	0.0151	13.81	107.93	5.10	5.10

Note: : cohesion of rocks.