Experimental Investigation of the Effects of the Gangue Particle Size on the Evolution Rules of Key Seepage Parameters

Table 5

Seepage discharges of different sizes of gangues.

Particle size (mm)	Axial load (MPa)	Hydraulic pressure (MPa)
		0~2	2	3	4	5	6	7	8
0~5	4	6.741	7.638	9.261	12.316	14.427	—	—	—
	6	3.59	5.78	6.93	7.57	8.505	—	—	—
	8	0	0	0	0	0.504	3.39	5.04	6.21
	10	0	0	0	0	0	0	0	0
5~10	4	62.43	—	—	—	—	—	—	—
	6	—	5.67	8.379	11.214	12.97	14.679	—	—
	8	—	6.237	7.632	8.26	8.31	—	—	—
	10	—	0	0	0	0.315	1.157	1.796	4.898
	16	0	0	0	0	0	0	0	0
10~15	4	62.43	—	—	—	—	—	—	—
	6	—	7.501	16.52	26.42	34.43	—	—	—
	8	—	6.237	7.632	8.26	8.31	—	—	—
	10	0	0	0	0	0	0	0	0
15~20	4	62.43	—	—	—	—	—	—	—
	6	13.549	62.43	—	—	—	—	—	—
	8	6.77	7.371	7.632	12.66	20.16	24.61	—	—
	10	0	2.16	3.41	3.59	5.66	—	—	—
	16	0	0	0	0	0	0	0	0

Because of limited range of the flowmeter, the flow rate of large-size gangues exceeded the measuring range, and simultaneously, small-size gangues were tightly compacted under large axial load, whose flow rates were fixed at 0 at different hydraulic pressures. Therefore, the permeability at that axial load condition can not be monitored.