Experimental and Numerical Study of Rock Stratum Movement Characteristics in Longwall Mining

Table 1

Mechanical parameters of rock mass.

Lithology	Volume weight (kN/m^3)	Young’s modulus (MPa)	Cohesion (MPa)	Internal friction angle (°)
Fine sandstone	28.72	1.41 × 10^4	4.28	40
Siltstone	26.98	1.08 × 10^4	3.95	40
Mudstone	25.12	0.45 × 10^4	2.02	31
Sandy mudstone	25.78	0.34 × 10^4	2.19	30
Coal	13.71	0.12 × 10^4	1.24	32