Floor Disturbance and Failure Characteristics of Super-Large Mining Height Working Face

Table 1

Physical and mechanical parameters of each stratum.

No.	Type	Thickness (m)	Bulk modulus (GPa)	Shear modulus (GPa)	Density (kg/m^3)	Tensile strength (MPa)	Cohesion (MPa)	Internal friction angle (°)
1	Limestone	50	24.56	21.59	2800	5.14	9.61	38
2	Bauxite mud	12	6.67	4	2700	0.85	4.61	29
3	Gritstone	7	8.22	5.91	2370	1.43	3.76	37
4	Mudstone	3	5	3.44	2330	0.56	2.65	26
5	Medium sandstone	4	7.04	5.5	2430	1.31	3.96	36
6	Mudstone	1	5	3.44	2370	0.56	2.65	26
7	Medium sandstone	6	7.04	5.5	2430	1.31	3.96	36
8	Mudstone	12	5	3.44	2370	0.56	2.65	26
9 ~ 15	No. 6 coal seam	24	0.43	0.19	1800	0.1	0.8	24
16	Sand slime stone interbedded	37	8.27	4.96	2570	1.25	4.34	36
17	Gritstone	14	9.48	6.82	2500	2.14	5.09	37
18	Mudstone	7	8.27	4.96	2570	1.25	4.34	36
19	Gritstone	9	9.48	6.82	2500	2.14	5.09	37
20	Mudstone	2	8.33	5	2570	1.31	4.64	32
21	Medium sandstone	4	9.69	6.38	2430	1.38	3.36	34
22	Mudstone	20	8.33	5	2570	1.31	4.64	32
23	Carbonaceous mudstone	11	8.46	5.57	1730	1.36	4.78	35
24	Mudstone	17	8.33	5	2570	1.31	4.64	32
25	Packsand	5	10.11	7.58	2460	1.66	4.05	38
26	Mudstone	9	8.33	5	2570	1.31	4.64	32
27	Gritstone	5	9.48	6.82	2370	1.49	3.62	36
28	Mudstone	5	8.33	5	2570	1.31	4.64	32
29	Gritstone	5	9.48	6.82	2370	1.49	3.62	36
30	Mudstone	9	8.33	5	2570	1.31	4.64	32
31	Gritstone	20	9.48	6.82	2370	1.49	3.62	36
32	Mudstone	24	8.33	5	2570	1.31	4.64	32