Research on rock burst prevention technology of roof-cutting roadway in inclined thin coal seam

According to the dynamic disaster control of rock burst in inclined thin coal seam,the roof-cutting roadway roof pre-splitting technology was proposed. By theoretical analysis,analogous simulation and seismicity monitoring,the mechanism of roof-cutting roadway roof pre-splitting and the effect of roof pre-splitting to reduce stress concentration of coal seam were analyzed,and the roof-cutting roadway layout parameters were optimized. The research results show that: the roof-cutting roadway makes presplit weakening region in the roof; in the process of working face advance,the roof strength decreases because of pre-splitting,on the other hand,there will be local stress concentration in the roofcutting roadway's corner regions in the hard roof,resulting in the roof easy to break,so as to control and reduce the roof weighting step and avoid high stress concentration in the coal. Around the single roof-cutting roadway,the maximum stress decrease reaches 29. 4%,while that is 49. 7% with the two roof-cutting roadway synergy zone. At the sametime,the mining seismic concentrating location is transferred from head area to the middle of mining face,avoiding the additive effect of dynamic load and static mining concentrated stress. Consequently,the risk of rock burst is reduced.The roof-cutting roadway spacing should be less than the hard roof's weighting step distance,and can be that of the allowable pressure step of roof arranged in pairs in the region of roof presplitting needed,but it should not be less than10 m.