Effect of Strong Mining on the Fracture Evolution Law of Trick Rise in the Mining Field and Its Control Technology

Table 1

Numerical model parameters.

Parameters	Roof strata	Coal strata	Floor strata
Young’s modulus,	20 GPa	10 GPa	18 GPa
Poisson’s ratio,	0.3	0.33	0.3
Internal cohesion,	4.7 MPa	3.5 MPa	4.6 MPa
Internal frictional angle,	37°	28°	35°
The proportion of damaged elements,	20%	25%	20%