Study on Control Technology for Working Faces Passing through Long-Span Abandoned Roadways

Table 1

Material parameters in the numerical simulation.

Strata	Thickness/m	Young’s modulus/GPa	Poisson’s ratio	Tensile strength/MPa	Cohesion/MPa	Friction angle/°
Pack sand	10.0	15.2	0.21	2.7	9.2	29
Sandy mudstone	9.0	7.5	0.25	0.9	3.6	26
Pack sand	12.0	17.1	0.17	3.9	7.1	29
Mudstone	5.0	9.2	0.22	1.3	3.7	21
Coal seam	6.0	6.7	0.19	0.7	2.9	23
Siltstone	10.0	12.9	0.27	1.5	5.6	25