Dynamic Effect and Control of Key Strata Break of Immediate Roof in Fully Mechanized Mining with Large Mining Height

Table 1

Rock mechanics parameters of 15104 face.

Stratum number	Lithology	Thickness/m	Accumulated height/m	Elasticity modulus/Gpa	Unit weight/kN·m^−3
4	Packsand	2	17	22.8	27.1	36334.1	175286.1
3	Sandy mudstone	3	15	7.24	26.2	20838.2	164343.2
2	Packsand	6	12	22.8	27.1	129029.8	36526.5
1	Mudstone	6	6	6.24	26.2