强冲击厚煤层上保护层尖灭区域冲击地压防治技术

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

摘要: 为保证上保护层尖灭被保护层工作面的回采安全，根据华丰煤矿地质条件，采用理论研究和数值分析的方法，研究其冲击地压发生机理和防治技术。结果表明：单保护层开采条件下，工作面大部分处于卸压范围内，上巷附近区域煤体应力产生集中，易发生冲击地压。通过采用“负煤柱”沿空掘巷能有效降低上巷附近区域煤体应力，促使高应力向深部转移。

Abstract: 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.