Stress Distribution and Failure Characteristics of Stope Overburden of an Inclined Coal Seam

Table 1

Physical and mechanical parameters of roof and floor of E9103 workface.

No.	Lithology	Thickness (m)	Density (kg.m^-3)	Bulk modulus (GPa)	Shear modulus (GPa)	Tensile strength (MPa)	Cohesion (MPa)	Internal friction angle (°)
1	Medium sandstone	44.0	2650	2.21	1.15	2.4	2.50	32
2	Fine sandstone	9.5	2620	1.93	1.00	2.20	2.78	36
3	Siltstone	4.0	2650	2.08	1.33	1.84	2.55	37
4	Fine sandstone	8.0	2650	1.93	1.00	2.20	2.78	36
5	Mudstone	5.0	2650	1.78	0.92	0.88	1.84	29
6	Siltstone	4.0	2650	2.08	1.33	1.84	2.55	37
7	Mudstone	6.0	2650	1.78	0.92	0.88	1.84	29
8	Siltstone	9.0	2650	2.08	1.33	1.84	2.55	37
9	Coal seam	4.5	1400	1.51	0.77	0.65	1.90	25
10	Mudstone	4.0	2650	1.78	0.92	0.88	1.84	29
11	Fine sandstone	7.0	2650	1.93	1.00	2.20	2.78	36
12	Mudstone	3.0	2650	1.78	0.92	0.88	1.84	29
13	Fine sandstone	6.0	2650	1.93	1.00	2.20	2.78	36
14	Siltstone	6.0	2650	2.08	1.33	1.84	2.55	37
15	Mudstone	3.0	2650	1.78	0.92	0.88	1.84	29
16	Medium sandstone	20.0	2650	2.21	1.15	2.4	2.50	32