深厚表土薄基岩综放工作面地表沉陷与冲击地压联动效应研究

结合新巨龙矿井深厚表土薄基岩综放工作面冲击地压防治问题,开展深厚表土层地表沉陷与冲击地压联动效应的实测研究。研究表明:深厚表土薄基岩首采综放工作面地表沉陷启动距约为114 m,仅为采深的1/7,远小于一般采场的启动距(1/4~1/2)倍采深。当地表进入充分采动阶段后,地表沉降速度与冲击地压存在明显的联动效应:地表沉降速度开始迅速增加时,工作面动压显现强烈;地表沉降速度迅速增加一般超前工作面动压显现。综合分析微震和地表沉陷数据,验证了岩层运动、地表沉陷与冲击地压发生具有一定相关性,可作为冲击地压预警的辅助参考。

Connected effect between surface subsidence and rock burst in fully mechanized caving face under deep alluvium

According to the rock burst prevention problem of fully mechanized caving face under deep alluvium in Xinjulong coal mine, field research was conducted to study connected effect between sur-face subsidence and rock burst. The results show that the starting distance of surface subsidence in fully mechanized caving face under deep alluvium is about 114m, which is merely 1/7 of the mining depth and much lower than the starting distance of mining depth in general mining conditions. When the sur-face is in the full-mining stage, an obvious connected effect is observed between the surface subsidence velocity and rock burst. When the surface subsidence velocity increases rapidly, the dynamic pressure manifestation can occur strongly in working face, and the rapid increase of surface subsidence velocity is generally ahead of dynamic pressure manifestation. Based on a comprehensive analysis of seismic and surface subsidence data, a certain correlation is verified between the occurrence of rock burst, sur-face subsidence and strata movement , which can be used as an auxiliary reference for rock burst pre-warning.