Evolution Mechanism of Water-Conducting Channel of Collapse Column in Karst Mining Area of Southwest China

Table 1

The physical parameters of rock mass.

Rock strata	h/m	K/GPa	G/GPa	d/N·m-3	f/°	C/MPa	t/MPa
Limestone	138	26.6	21.9	2800	42	6.53	5.7
Kern stone	4	21.3	16.7	2650	38	4.23	3.23
Limestone	20	26.6	21.9	2800	42	6.53	5.7
Siltstone	6	18.5	16.2	2800	37	3.64	2.25
Silty mudstone	13	19.4	9.5	2840	33	2.65	2.1
Fine sandstone	7	20.7	17.8	2800	37	3.64	2.25
Silty mudstone	9	19.4	9.5	2840	33	2.65	2.1
Fine sandstone	30	7	20.7	17.8	2800	37	3.64
Silty mudstone	5	19.4	9.5	2840	33	2.65	2.1
Fine sandstone	6	20.7	17.8	2800	37	3.64	2.25
Coal seam	2	3.89	1.59	1600	40	1.50	1.2
Argillaceous siltstone	5	21.0	12.6	2770	35	3.15	2.31
Collapse column	186	1.30	0.50	1300	35	0.5	0.5