Control Mechanism of Rock Burst in the Floor of Roadway Driven along Next Goaf in Thick Coal Seam with Large Obliquity Angle in Deep Well

Table 3

Coal powder amounts at different borehole depths of 1412 working face.

Borehole depth/m	2 m	3 m	4 m	5 m	6 m	7 m	8 m	9 m
Coal powder amount/kg
Standard coal power	1.94	2.18	2.20	2.07	2.27	2.16	2.15	2.10
Driving period	2.10	2.30	2.41	2.23	2.20	2.46	3.39	2.27
Stopping period	2.35	2.43	2.58	3.14	2.47	2.34	2.45	2.76