“三软”厚煤层回采巷道锚网索梁联合支护技术

Combined support technology of bolt-mesh-cable-beam in the three-soft thick coal seam

根据"三软"厚煤层回采巷道工程地质条件,采用工程类比法和理论计算法设计了"三软"厚煤层锚网索梁联合支护参数。并对运输巷表面位移及顶板离层位移进行现场监测,结果表明:巷道两帮最大移近量110mm,顶底最大移近量135mm;巷道浅基点最大离层量是8mm,深基点最大离层量是25mm,较好控制了大断面软岩巷道围岩变形及顶板离层,提高了巷道整体稳定性。

According to the engineering geological conditions of the three-soft thick coal seam mining roadway,engineering analogy method and theoretical calculation were used to design the parameters for bolt-mesh-cable-beam combined support.The surface displacement of transportation roadway and the roof separation were monitored.According to the results,the max two-rib convergence was110 mm,and the max roof-to-floor convergence was 135mm; the max separation of roadway shallow base point was 8mm,and 25 mm for deep base point,which indicated that,the surrounding rock deformation and roof separation were controlled in large-section soft-rock roadway,and the overall roadway stability was improved.