煤矿高浓度胶结充填开采沿空留巷技术研究

摘要

Taking 0203 working face of Xinyang coal mine as engineering background,and through the theoretical analy-sis and numerical simulation,the pressure characteristics of gob-side entry retaining roadway under caving method and filling method are contrasted and analyzed to further explore the deformation law of gob-side entry retaining roadway after total back-filling. Combined with the basic mechanical properties of high concentration of cemented filling materials, the basic roadway supporting and the strengthening support mode are designed and applied into the practical production. The application showed that the gob-side entry retaining had less deformation after backfilling with deformation rate of around 8%. The roadway roof kept complete without any large caving,and no coal wall spalling appeared at roadway. Single support or combined support of anchor rod,anchor rope,metal mesh at roadway is reliable and reasonable. The high concentration of cemented filling mining technique with gob-side entry retaining is simple and feasible. The gob-side entry retaining roadway is formed naturally after filling gob,and the fire,gas accumulation and other disasters can be effectively avoided. Thus,it has a broad application pros-pect.%以新阳煤矿10203充填工作面为研究背景，通过理论分析和数值模拟，对垮落法和充填法开采下的采空区沿空留巷巷道矿山压力进行了对比分析，进一步探究了采空区全部充填后沿空留巷巷道的变形规律。结合高浓度胶结充填体的力学特性，设计了沿空留巷巷内基本支护、加强支护的方式，并将其运用于生产实践。井下应用表明：充填开采后的沿空留巷巷道围岩变形量较小，其变形率仅为8%左右；巷道顶板较为完整，没有发生大的冒落，且巷道煤壁无片帮现象发生；巷道内采用的锚杆、锚索、金属网、单体支柱联合支护安全可靠，支护合理。煤矿高浓度胶结充填开采沿空留巷技术工艺简单，可操作性强，采空区充填完毕后自然形成沿空巷道，而且杜绝了沿空留巷巷道常见的火灾、瓦斯等灾害，具有广阔的应用前景。