Study on the Rheological Failure Mechanism of Weakly Cemented Soft Rock Roadway during the Mining of Close-Distance Coal Seams: A Case Study

Table 2

Mechanical properties of the coal measures that are used in the model.

Coal measures	Thickness (m)	Density (g.cm^−3)	Young’s modulus (GPa)	Shear modulus (GPa)	Tensile strength (MPa)	Cohesion (MPa)	Friction angle (°)
Mudstone	14	2.30	6.2	3.5	1.1	2.3	27
Sandy mudstone	20.8	2.52	15.4	7.3	1.2	2.2	30
Medium sandstone	15.1	2.59	16.8	8.6	1.7	5.5	29
Fine sandstone	18.2	2.49	26.8	12.1	1.2	4.5	32
Mudstone	9.8	2.3	6.2	3.5	1.1	2.3	27
2-2上 coal	3.5	1.42	1.7	1.1	1.0	2.3 (0.8)	35 (25)
Sandy mudstone	5	2.52	15.4	7.3	1.2	2.2 (0.62)	30 (22)
2-2中 coal	3.5	1.42	1.7	1.1	1.0	2.3 (0.8)	35 (25)
Sandy mudstone	9.5	2.52	15.4	7.3	1.2	2.2 (0.62)	30 (22)
Siltstone	17.8	2.54	17.6	8.0	1.7	5.5	32

Numbers in parentheses are residual values.