Experimental Study on Physicomechanical Properties of Deep Sandstone by Coupling of Dry-Wet Cycles and Acidic Environment

Table 7

Comparison of calculated value and test value of damage model.

Stage of A-D-W cyces	pH = 4				pH = 5				pH = 6				pH = 7
	σ (MPa)	E (GPa)	σp (MPa)	Ep (GPa)	σ (MPa)	E (GPa)	σp (MPa)	Ep (GPa)	σ (MPa)	E (GPa)	σp (MPa)	Ep (GPa)	σ (MPa)	E (GPa)	σp (MPa)	Ep (GPa)
	Test value		Predicted value		Test value		Predicted value		Test value		Predicted value		Test value		Predicted value
Stage I	56.03	11.29	54.43	11.52	68.28	11.15	52.30	11.08	67.50	13.19	70.04	14.84	86.46	16.94	78.69	16.67
Stage II	34.83	7.16	32.29	6.51	40.26	6.54	41.47	6.77	48.30	13.11	50.48	9.93	66.91	13.33	64.91	12.86
Stage III	31.99	3.36	19.59	3.95	37.37	4.81	28.24	4.61	44.74	7.39	37.45	7.32	60.79	8.23	51.68	10.82
Stage IV	29.15	2.46	11.70	2.36	29.07	3.21	19.97	3.26	33.83	4.02	29.22	5.69	45.80	11.42	47.39	9.54