陕西煤炭

针对厚煤层大采高工作面开切眼跨度大、地质条件复杂、围岩支护难度大的问题，以陕西某矿S5205综放工作面开切眼为研究对象，基于压力拱法研究围岩变形规律。通过理论计算得出破坏深度，并采用工程类比法确定切眼支护方案，采用“顶锚索+帮锚杆+金属网”的支护方式。通过FLAC^3D数值模拟软件进行计算，顶板最终收敛量为27.5 mm,两帮移进量为19.2 mm,顶板未发生坍塌。采用十字测点法对切眼进行表面移进量监测，测得数据与数值模拟计算结果相近，结果表明该支护方案可以有效控制开切眼围岩的稳定。

In order to solve the problems of large span of cutting hole, complex geological conditions and difficult support of surrounding rock in the large mining height working face of thick coal seams, the deformation law of surrounding rock was studied based on the pressure arch method by taking the cutting hole of the S5205 fully mechanized working face of a mine in Shaanxi Province as the research object.The depth of failure is obtained through theoretical calculation, and the engineering analogy method is used to determine the hole-cutting support scheme, and the support mode of “roof anchor cable+side anchor rod+metal mesh” is adopted.The final convergence of the roof was 27.5 mm, the narrowing of the two sides was 19.2 mm, and the roof did not collapse.The surface displacement of the cutting hole is monitored by the cross measurement point method, and the measured data are similar to the numerical simulation results, indicating that the support scheme can effectively control the stability of the surrounding rock of the cutting hole.