Mechanism and Prevention and Control of Mine Earthquake in Thick and Hard Rock Strata considering the Horizontal Stress Evolution of Stope

Table 1

Mechanical parameters of the rock model.

Type of rock strata	Thickness (m)	Unit weight (kN∙m^−3)	Modulus of elasticity (GPa)	Internal friction angle (°)	Tensile strength (MPa)
Topsoil	75.0	18	14.5	22	1.4
Igneous rock	180.0	27	30.5	40	6.5
Limestone	30.0	27	22.5	37	4.1
Sandy mud interbedding	38.0	24	16.5	29	2.9
Carbonaceous mudstone	7.0	20	14.5	24	2.0
No. 6 coal	7.0	14	13.5	20	1.7
Sandstone	3.0	25	15.5	25	2.2