A Risk Assessment Method for Rockburst Based on Geodynamic Environment

Table 10

Geological data of all the strata overlying above the working face.

No.	Rock type	Thickness /m	Compressive strength/MPa	No.	Rock type	Thickness /m	Compressive strength/MPa
1	No. 3-5 coal seam	18.60	15.94	12	Coarse sandstone	3.90	43.87
2	Coarse sandstone	13.35	43.87	13	Siltstone	4.95	55.73
3	Siltstone	7.05	55.73	14	Mudstone	9.60	43.23
4	Coarse sandstone	3.15	43.87	15	Coarse sandstone	1.80	43.87
5	Siltstone	4.35	55.73	16	Mudstone	3.15	41.35
6	Sandy mudstone	5.55	41.35	17	Coarse sandstone	11.85	43.87
7	Siltstone	1.95	55.73	18	Sandy mudstone	7.05	41.35
8	Fine sandstone	1.65	61.53	19	Coarse sandstone	2.55	43.87
9	Siltstone	2.25	55.73	20	Sandy mudstone	15.60	41.35
10	Coarse sandstone	14.85	43.87	21	Siltstone	3.75	55.73
11	Siltstone	4.35	55.73