Study on the Creep Constitutive Model of a Sandstone Rock under the Water-Rock Interaction

Table 1

Identified parameters for the nonlinear creep constitutive model.

Cycles	Direction	Load level
0	Axial	First step	2.19	7.10	21.44	-	-	0.99
		Second step	2.82	4.83	24.49	-	-	0.99
		Third step	1.88	4.13	24.06	-	-	0.99
		Fourth step	10.41	4.54	10.17	-	-	0.99
		Fifth step	12.58	6.81	8.84	2.08	5.45	0.98
	Lateral	First step	14.45	2.44	65.83	-	-	0.99
		Second step	27.37	2.71	55.31	-	-	0.99
		Third step	3.95	1.90	28.00	-	-	0.99
		Fourth step	4.11	1.90	11.70	-	-	0.99
		Fifth step	4.11	6.79	9.47	0.52	10.62	0.98
2	Axial	First step	0.82	5.2	12.8	396.0	32.4	0.96
		Second step	0.98	3.9	9.4			0.97
		Third step	5.7	2.8	8.7			0.97
		Fourth step	1.8	1.3	6.3			0.99
		Fifth step	9.3	5.0	763.3			0.98
	Lateral	First step	3.9	2.7	47.5	111.9	7.6	0.98
		Second step	2.5	2.4	22.6			0.99
		Third step	1.6	1.5	10.2			0.98
		Fourth step	0.97	0.45	3.3			0.97
		Fifth step	450.6	3.4	516.8			0.99
6	Axial	First step	54.5	0.68	2.1	43.9	63.6	0.99
		Second step	0.86	2.6	12.8			0.98
		Third step	1.0	1.1	18.9			0.99
		Fourth step	2.7	3.6	20.9			1.00
	Lateral	First step	26.4	1.9	11.3	73.5	1.9	0.98
		Second step	4.4	1.1	13.7			0.98
		Third step	1.3	0.24	6.5			0.99
		Fourth step	11.3	4.6	677.5			1.00
10	Axial	First step	0.61	3.0	4.0	246.3	29.7	0.99
		Second step	1.4	3.5	9.6			0.98
		Third step	0.78	1.2	9.1			0.99
		Fourth step	63.9	1.2	17.3			1.00
	Lateral	First step	0.88	3.8	2.6	62.1	6.8	0.99
		Second step	5.1	1.4	9.7			0.98
		Third step	18.5	0.33	3.6			0.98
		Fourth step	0.9	711.1	14.8			1.00