Mining-Induced Pressure-Relief Mechanism of Coal-Rock Mass for Different Protective Layer Mining Modes

Table 2

Experimental plan table.

Serial number	Initial confining pressure (MPa)	Mode of mining		Axial loading rate (MPa·min^−1)	Confining pressure unloading rate (MPa·min^−1)
					1	15	Soft rock protective layer	9.13	4.565	0.5	0.5
2	Coal seam protective layer	7.65	3.825	0.5	0.5
3	20	Soft rock protective layer	6.84	3.42	0.5	0.5
4	25	Soft rock protective layer	5.47	2.735	0.5	0.5
5		Coal seam protective layer	4.59	2.295	0.5	0.5