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

Table 4

The damage load, peak stress, and peak strain of specimens without water under confining pressure of 2 MPa.

Specimen no.	Diameter (mm)	Height (mm)	Damage load (kN)	Peak stress (MPa)	(MPa)	(10^-2)
L-21	49.9	99.9	74.22	37.18	32.34 (87%)	1.61
L-22	50.0	100.1	78.59	40.05	33.84 (85%)	1.72
L-23	50.1	100.2	88.84	45.20	38.42 (85%)	1.79
L-24	49.9	100.2	76.28	38.87	34.98 (90%)	1.81
L-25	49.8	99.6	104.46	53.23	47.89 (89%)	2.01