Research on the Deformation Mechanism of Mining Roadway Stratiform Surrounding Rock with Nonuniform Stress Field

Table 2

Mechanical parameter of models.

Group	Bulk modulus (GPa)	Shear modulus (GPa)	Internal friction angle (°)	Cohesion (MPa)	Density (kg·m^−3)	Tensile strength (MPa)
Mudstone	2.17	1.41	36	1.5	2775	1.32
Siltstone	3.47	2.08	41	4.3	2745	2.62
Sandy mudstone	3.12	1.78	36	2.16	2530	2.25
Limestone K2	5.22	2.54	37	7.8	2800	4.21
Coal seam 15#	0.87	0.48	30	1.26	1500	0.03
Interband coal	0.81	0.42	30	1.16	2400	0.2