Study on Stress Distribution Law of High-Efficiency Paste Backfilling Working Face with Solid Waste in Thick Coal Seam

Table 1

Coal (rock) mechanical parameters.

Layer		Parameters
		Tensile strength (MPa)	Elastic modulus (GPa)	Poisson’s ratio	Cohesion (MPa)	Internal friction angle (°)
Upper strata	Medium grained sandstone	4.32	32.12	0.23	2.72	25
Main roof	Siltstone	3.56	21.16	0.23	2.02	26
Direct roof	Sandy mudstone	2.18	15.73	0.25	1.19	31
Coal seam	Coal	1.35	1.73	0.29	0.53	29
Immediate floor	Sandy mudstone	1.65	13.73	0.24	1.09	30