Control of Water Inrush from Longwall Floor Aquifers Using a Division Paste Backfilling Method

Table 1

The rock mass properties.

No.	Lithology	Density (kg/m^3)	Bulk modulus (GPa)	Shear modulus (GPa)	Cohesion (MPa)	Friction angle (°)	Tensile strength (MPa)
1	Grit stone	2450	31.37	23.51	8.61	44	9.12
2	Fine stone 11 sandstone	2600	19.71	14.62	6.52	37	6.94
3	Medium stone	2550	31.35	20.51	6.80	42	7.61
4	Siltstone	2650	16.35	12.24	4.69	31	2.36
6	Coal	1450	0.78	0.45	2.21	22	0.41
7	Mudstone	2250	7.11	3.98	3.45	35	0.89