综放工作面软底沿空留巷围岩控制技术研究

Study on Surrounding Rock Control Technology of Gob Side Entry Retaining with Soft Bottom in Fully Mechanized Top Coal Caving Face

针对木瓜煤矿10-201轨道巷沿空留巷期间变形破坏严重的问题,运用数值模拟、理论分析等手段,研究巷旁充填墙体强度、宽度对留巷围岩稳定性影响规律,优化沿空留巷围岩控制技术。结果表明:巷旁充填材料采用C30混凝土,最佳宽度1.5 m,采用注浆锚索+切顶锚索+挖槽、浇筑条形基础联合支护措施后,沿空留巷围岩整体稳定,取得良好的应用效果和经济效益。

In view of the serious deformation and damage during gob side entry retaining of 10-201 track roadway in Mugua Coal Mine,numerical simulation and theoretical analysis are used to study the influence law of the strength and width of the filling wall beside the roadway on the stability of the surrounding rock of the roadway,and optimize the control technology of the surrounding rock of gob side entry retaining.The results show that the roadside filling material is C30 concrete,the optimum width is 1.5 m,and the combined support measures of grouting anchor cable+top-cutting anchor cable+trench and pouring strip foundation are adopted,the surrounding rock of gob side entry retaining is stable as a whole,and good application effect and economic benefit are obtained.