Study on Failure Characteristics and Reasonable Mining Parameters of Upward Mining of Integrated Coal Mine

Table 1

Physical and mechanical parameter table of coal and rock mass.

Serial number	Lithologic characters	Thickness/m	Density/(kg/m^3)	Bulk modulus/GPa	Shear modulus/GPa	Cohesion/MPa	Angle of friction/°	Resistance strength/MPa
1	Mudstone	2.8	2250	7	4	2.1	15	1.8
2	3# coal seam	6.3	1400	5	3.2	1.8	20	0.8
3	Mudstone	8.2	2250	7	4	2.1	15	1.8
4	Post office box stone	2.7	2530	18.6	12.4	4.6	36	3.2
5	Mudstone	5.8	2250	7	4	2.1	15	1.8
6	Limestone	4.6	2510	8	6	2.1	32	2.0
7	Siltstone	15.62	2450	21.2	16.8	4.0	38	4.1
8	Mudstone	8.6	2250	7	4	2.1	15	1.8
9	Post office box stone	9.2	2530	18.6	12.4	4.6	36	3.2
10	9# coal seam	1.3	1400	5	3.2	1.8	20	0.8
11	Post office box stone	6.79	2530	18.6	12.4	4.6	36	3.2
12	Medium grained sandstone	10.76	2430	20	13.6	4.5	32	2.8
13	Mudstone	3.66	2250	7	4	2.1	15	1.8
14	Limestone	10.17	2510	8	6	2.1	32	2.0
15	15# coal seam	2.66	1400	5	3.2	1.8	20	0.8
16	Mudstone	4.24	2250	7	4	2.1	15	1.8