Rock Burst Prevention Technology for Pinching Out Area of Upper Protective Coal Seam in Thick Coal Seams with Strong Rock Burst Tendency

In order to ensure safety mining of working face when upper protective layer pinches out the protected layer. Based on the geological conditions of Huafeng Coal Mine, we study the mechanism of rock burst occurrence and prevention technology by theoretical research and numerical analysis. Results show that, under the condition of single layer mining, the working face is mostly in pressure relief range and coal bed stress concentrates around upper roadway, rock burst easily happens. Adopting “negative coal pillar” for gob-side entry driving can effectively reduce coal rock stress around upper roadway and make high stress transfer to deep area.