急倾斜中厚煤层斜切分段短壁工作面围岩变形监测与控制

Surrounding Rock Deformation Monitoring and Control at Oblique Cut Short Wall Working Face in Steeply Inclined and Middle Thickness Coal Seam

为解决斜切分段短壁工作面存在的顶板隐患,通过理论分析、数值模拟及现场围岩变形监测及顶板预裂爆破等方法,对某矿急倾斜中等厚度的A3煤层进行了研究。结果表明：悬顶的长度越长,对短壁工作面的安全隐患越大;顶板的高应力、大位移变化主要在距切眼70～120 m的范围内,应力在线监测验证了这个结果;针对斜切分段工作面,提出了相应的顶板预裂爆破方案,并对现场实施顶板预裂爆破前后的围岩变形情况进行了对比,验证了顶板爆破的效果。

To solve the hidden trouble in roof oblique segmentation section of short wall mining face,through theoretical analysis,numerical simulation and field surrounding rock deformation monitoring and roof pre-splitting blasting,we study steep medium thickness A3 coal seam,and the results show that： the longer the length of the hanging arch,the greater the safety hidden danger of short wall working face; high stress of cavern roof,the large displacement change are mainly concentrated in the range of 70 m to 120 m from the cut-hole,and the results are verified by stress on-line monitoring; for oblique segmentation working face,we propose roof pre-splitting blasting scheme; we propose corresponding roof pre-splitting blasting,and contrast surrounding rock deformation before and after the implementation of roof pre-splitting blasting,and verify the roof blasting effect.