Surrounding Rock Movement of Steeply Dipping Coal Seam Using Backfill Mining

Table 1

Mechanical properties of rock parameters of the numerical model.

Lithology	Thickness (m)	Bulk density (kg.m^−3)	Elastic modulus (GPa)	Poisson’s ratio	Tensile strength (MPa)	Cohesion (MPa)	Friction angle (°)
Siltstone interbedding	100	2650	9.3	0.25	10.2	11.3	36
Main roof siltstone	14	2700	8.1	0.24	8.6	5.3	35
Immediate roof siltstone	4	2650	7.5	0.24	6.0	3.4	33
Coal	2	1780	4.2	0.32	2.1	1.5	24
Immediate floor siltstone	8	2620	6.8	0.25	7.4	2.0	34
Main floor siltstone	20	2670	8.2	0.23	9.4	3.0	35
Diabase interbedding	100	2720	13.4	0.22	13.1	4.0	37
Waste rock	1.8	2000	0.5	0.37	0.1	0.2	15
Joint parameters	—	—	0.7	0.36	2	1	22