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

Table 3

Mechanical properties of numerical model.

Coal and rock mass	Bulk modulus K/GPa	Shear modulus G/GPa	Density d/kg·m^−3	Friction angle/°	Cohesive force/MPa	Tensile strength/MPa
Overlying rock	3	2.3	2200	30	2	2
Main roof	10.1	8.2	2700	33	5.9	3
KISR	5.1	4.2	2500	33	3.9	3
Immediate roof	1.85	1.64	2000	24	1.1	1.19
15# coal seam	2.05	1.84	1400	25	1.85	0.89
Floor	10	8	2500	30	7	5