Study on the Formation Mechanism of Rock Burst Caused by Seam Floor Slip under an Ultrathick Conglomerate

Table 1

Geostress test results in the deep part of the Gengcun Coal Mine.

Test point	H (m)	(mpa)	σH (mpa)	σh (mpa)	k
1	621	15.53	12.58	7.09	0.81
2	622	15.55	13.93	7.29	0.89
3	599	14.98	14.84	7.69	0.99
4	633	15.83	17.51	9.05	1.11

H: buried depth of the test point, : vertical stress, σ_H: maximum horizontal stress, σ_h: minimum horizontal stress, and k: side pressure ratio.