Evolution Mechanism of Water-Conducting Fissures in Overlying Rock Strata with Karst Caves under the Influence of Coal Mining

Table 1

Numerical simulation of physical and mechanical parameters.

Rock formation	Thickness (m)	Bulk modulus (GPa)	Shear modulus (GPa)	Density (N·m^-3)	Angle of internal friction (°)	Group cohesiveness (MPa)	Tensile strength (MPa)
Yulong mountain limestone	268	31.93	18.25	2960	57.51	6	8.59
Mudstone	20	8.23	4.70	2630	31.73	1.1	1.53
Changxing group limestone	35	31.93	18.25	2960	57.51	6	8.59
Silty mudstone	27	25.81	14.02	2690	50.77	4.07	6.82
Argillary siltstone	3	23.64	12.85	2820	44.82	3.08	7.41
4# seam	3	1.19	0.82	1450	25	1.3	1.79