Surrounding Rock Movement of Steeply Dipping Coal Seam Using Backfill Mining

Table 2

The strata physical and mechanical parameters.

Lithology	Thickness (m)	Compressive strength (kg/cm^2)	Bulk density (kg.m^−3)
Main roof siltstone	14	918	2700
Immediate roof siltstone	4	734	2650
Coal	2	208	1780
Immediate floor siltstone	8	758	2620
Main floor siltstone	20	1050	2670