同一铅垂面不同层位沿空掘巷矿压特征研究及应用

Research and Application on Ground Pressure Roadway Characteristic of Driving along Next Goaf in Different Formation of Same Vertical Plane

华丰煤矿采深超过1 km,煤层倾角32°。此矿采用传统留小煤柱进行沿空掘巷,巷道变形严重,影响安全生产;如采用沿空留巷的无煤柱开采技术,由于受千米埋深的高地应力影响,沿空留巷会产生大变形,并且围岩不稳定。为解决以上难题,提高煤炭回收率,采用错层位沿空掘巷方法。通过建立沿空掘巷基本顶的力学模型,分析推导巷道围岩冲击地压发生机理,据此采取煤层超前注水和危险区爆破卸压等防冲措施。

The mining depth of Huafeng coal mine is over 1 000 m,and the obliquity coal seam is 32°.Traditional small coal pillar is used for roadway driving along next goaf in this coal mine,and the roadway deformation is serious,which the safety in production is affected.Due to high ground stress effect of one thousand meters depth,large deformation and instability of surrounding rock takes place under gob-side entry retaining without coal pillar mining technology.The stagger arrangement gob-side entry driving is adopted to solve the above major problem.The mechanism of roadway rock burst is analyzed through the establishment of main roof mechanical model of gob-side entry driving.Coal seam advance blasting injection and relieve-shot of dangerous zone which is preventing rock burst approach is adopted according to the above research.