Roadway Deformation and Control under Multidisturbed Secondary High Stress

Table 1

Physical and mechanical parameters of coal and rock stratum.

Number	Rock lithology	Thickness (m)	Density ()	Bulk modulus (GPa)	Shear modulus (GPa)	Friction angle (°)	Cohesion (MPa)	Tensile strength (MPa)
1	Loess	34	1960	0.25	0.09	25	8.5	0.35
2	Fine-grained sandstone	7	2610	2.23	1.67	38	3	3.15
3	Mudstone	3	2604	5.88	3.19	41	5.4	3.18
4	Siltstone	2	2603	7	4	43	6.3	4.99
5	Medium-grained sandstone	6	2987	4.34	2.3	40	4.3	2.7
6	Fine-grained sandstone	8	2690	2.23	1.67	32	3.8	3.17
7	Siltstone	7	2558	6.32	3.61	33	8.7	3.07
8	Medium-grained sandstone	8	2987	4.34	2.3	40	4.3	2.07
9	Coal	4	1445	0.71	0.49	22	2.44	0.24
10	Mudstone	1.5	2604	5.88	3.19	41	5.4	3.18
11	Siltstone	5	2603	7	4	43	6.3	4.99
12	Medium-grained sandstone	5	2987	4.34	2.3	40	4.3	2.7
13	Fine-grained sandstone	6	2690	2.23	1.67	32	3.8	3.17
14	Mudstone	3	2604	5.88	3.19	41	5.4	3.18
15	Siltstone	7	2558	6.32	3.61	33	8.7	3.07
16	Fine-grained sandstone	10	2610	2.23	1.67	38	3	3.15
17	Medium-grained sandstone	10	2987	4.34	2.3	40	4.3	2.7
18	Siltstone	16	2603	7	4	43	6.3	4.99