Research on Energy and Instability Criterion of Sandstone Hydraulic Fracturing in the Three Gorges Reservoir Area, Chongqing, China

Table 1

Test programs and parameters.

Test classification				Strength percentage
	(MPa)	(MPa)	(MPa)	(%)	(GPa)
Conventional uniaxial	50.98	0	0.00	60.0	7.08	0.14
Conventional triaxial	94.34	10	0.00	32.4	11.59	0.11
Uniaxial water pressure	30.58	0	12.20	60.0	10.13	0.17
Triaxial water pressure	30.55	10	18.82	32.4	12.97	0.11