Progressive Failure and Fracture Mechanism of Sandstone under Hydraulic-Mechanical Coupling

Table 1

Basic information on samples and experiments.

Number	Diameter (mm)	Length (mm)	Quality (g)	Density (g/cm^3)	wave velocity (m/s)	Confining pressure (MPa)	Pore water pressure (MPa)	Loading speed of the shaft and confining pressure (MPa/min)	Pore water loading speed (MPa/min)
10–5	49.63	100.29	424.8	2.19	1953	10	5	60	20
20–5	49.59	98.82	416	2.18	2022	20	5
30–5	49.59	99.44	422.2	2.20	1980	30	5
20–10	49.6	99.21	422	2.20	1976	20	10
30–10	49.75	100.78	425.4	2.17	1992	30	10
30–20	49.78	100.5	425.8	2.18	2043	30	20