Study on the Permeability Evolution and Its Formation Mechanism of Xiaojihan Aquifer Coal Seam under Plastic Flow

Table 3

The damage load, peak stress, and peak strain of water-bearing specimens under confining pressure of 2 MPa.

Specimen no.	Diameter (mm)	Height (mm)	Damage load (kN)	Peak stress (MPa)	(MPa)	(10^-2)
X-21	50.2	99.8	65.20	32.96	29.66	1.61
X-22	50.0	99.9	67.89	34.73	31.26	1.72
X-23	49.9	100.0	63.72	32.47	29.22	1.79
X-24	50.3	100.9	86.94	43.95	39.56	1.81
X-25	50.2	100.3	82.60	41.59	37.43	2.01