Dynamic Monitoring and Research on the Evolution of the Damage of Weakly Consolidated Coal Floor under Dynamic Pressure Using Distributed Optical Fiber

Table 2

Mechanical parameters of rock mass in the model.

Lithology	Modulus of elasticity (GPa)	Modulus of shear (GPa)	Cohesion (MPa)	Angle of internal friction ψ (°)	Tensile strength Rm (MPa)	Density (kg/m^3)
Coal	7.6	0.6	2.7	31.4	0.35	1460
Siltstone	15.6	2.5	3.1	35.2	1.45	2650
Fine sandstone	15.2	1.52	3.2	36.0	1.65	2675
Medium sandstone	13.7	4.3	3.0	35.4	1.6	2697
Coarse sandstone	12.7	5.8	2.8	34.9	1.55	2705
Sandy mudstone	10.2	2.56	2.9	37.5	1.3	2659