On a Possible Mechanism of Hydrostatic Pressure on Mineshaft Linings in Western China

Table 2

The water pressure reduction coefficient under typical parameters.

	(m^3/h)	The decreasing of permeability due to grouting
		10%	20%	30%	40%	Average
600	3.0	0.79	0.76	0.73	0.68	0.74	0.54	0.67
	4.5	0.68	0.64	0.59	0.52	0.61
	6.0	0.57	0.52	0.45	0.36	0.48
	7.5	0.47	0.40	0.31	0.20	0.34
800	3.0	0.84	0.82	0.80	0.76	0.80	0.66
	4.5	0.76	0.73	0.69	0.64	0.71
	6.0	0.68	0.64	0.59	0.52	0.61
	7.5	0.60	0.55	0.49	0.40	0.51
1000	3.0	0.87	0.86	0.84	0.81	0.84	0.72
	4.5	0.81	0.78	0.75	0.71	0.76
	6.0	0.74	0.71	0.67	0.61	0.68
	7.5	0.68	0.64	0.59	0.52	0.60
1200	3.0	0.89	0.88	0.86	0.84	0.87	0.77
	4.5	0.84	0.82	0.79	0.76	0.80
	6.0	0.79	0.76	0.73	0.68	0.74
	7.5	0.73	0.70	0.66	0.60	0.67