Influence of Unloading Conditions of Confining Pressure on the Compressive Strength and Permeability of Deep Mudstone

Table 1

Compressive strength of different specimens.

Specimen number	Buried depth (m)	Confining pressure (MPa)	Diameter (mm)	Compressive strength (MPa)
MS-2-0-1	200	0	49.97	70.85
MS-2-0-2	200	0	50.21	71.20
MS-2-0-3	200	0	48.97	68.58
MS-2-15-1	200	15	49.91	121.50
MS-2-15-2	200	15	51.24	123.52
MS-2-15-3	200	15	50.37	117.26
MS-2-30-1	200	30	50.01	148.00
MS-2-30-2	200	30	49.87	153.26
MS-2-30-3	200	30	49.93	146.21
MS-10-0-1	1000	0	49.87	42.96
MS-10-0-2	1000	0	50.33	38.56
MS-10-0-3	1000	0	51.02	45.36
MS-10-15-1	1000	15	48.98	81.23
MS-10-15-2	1000	15	49.51	86.58
MS-10-15-3	1000	15	50.97	78.26
MS-10-30-1	1000	30	49.49	107.21
MS-10-30-2	1000	30	50.87	119.54
MS-10-30-3	1000	30	50.49	121.23