Spatial and Temporal Distribution Law and Influencing Factors of the Mining-Induced Deformation and Failure of Gas Boreholes

Table 5

Parameters for backfilling wall materials.

	Density (kg·m^−3)	Bulk modulus (GPa)	Shear modulus (GPa)	Cohesion (MPa)	Internal friction (°)	Tensile strength (MPa)
C20	2000	2.2	0.9	3	20	0.75
C30	2300	2.4	1.3	4.2	22	1.05
C40	2500	2.7	1.7	5.4	24	1.35