Numerical Simulation on the Evolution of Mining-Induced Fracture Network in a Coal Seam and Its Overburden under the Top Coal Caving Method

Table 1

Detailed introduction of the rock types and thicknesses of the 8212 working face strata.

No.	Strata	Thickness (m)	Accumulative thickness (m)
1	Mudstone	22	22
2	Fine sandstone	8	30
3	Mudstone	8.6	38.6
4	Coal seam #8	6	44.6
5	Mudstone	4	48.6
6	Pebbly sandstone	9	57.6
7	Fine sandstone	6	63.6
8	Medium sandstone	12	75.6
9	Mudstone	3.9	79.5
10	Coal seams #3–5	11.6	91.1
11	Pebbly sandstone	9	100.1
12	Coal seam #2	2.4	102.5
13	Siltstone	24	126.5
14	Coal seam Shan #4	1.8	128.3
15	Mudstone	5.4	133.7
16	Medium sandstone	15	148.7
17	Fine sandstone	15	163.7
18	Medium sandstone	27.4	191.1
19	Overburden strata	434	625.1