Analysis of grouted mesh-shell-bolts support stress in soft rock tunnel by measurement
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摘要: 软岩巷道支护是煤炭开采中的一大难题,古汉山矿西大巷围岩工程地质条件差,巷道变形破坏严重,支护难度大,采用了网壳锚喷支护方式。通过实测在地应力及构造应力作用下,网壳锚喷支护支架主弦杆、内骨筋的应力分布情况及支架与围岩的接触应力,分析了支架应力分布及其变化规律。结果表明,网壳支架在偏载和高构造应力情况下均能保持良好的工作状态,能够很好地控制复杂地质条件下巷道围岩的变形和破坏。Abstract: The support of roadway within soft rock is a difficult problem in coal mining operation.In Guhanshan Mine,the engineering geological conditions of wall rock of the west main roadway is worse,the roadway was seriously deformed and destroyed,and it is difficult to support using routine method,so the grouted mesh-shell-bolt support is employed to solve this problem.Under the function of ground stress and tectonic stress,the stress distribution of the main chord pole and the inner bone tendon and the coupling stress between support and surrounding rock are measured in situ.The internal force distribution and its variation law of the support are analyzed,the results indicate that under bias loading and high tectonic stress,the mesh-shell support could keep good functional mode and the deformation and destruction of roadway surrounding rock under complex geological conditions could be controlled effectively.
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