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在利用煤孔测定本煤层瓦斯压力的过程中,为从根本上封堵煤层钻孔周围的裂隙,解决煤层钻孔易变形、塌孔的问题,提出了仿岩孔瓦斯压力测定方法。钻孔失稳破坏的力学分析表明,钻孔破碎带半径与围岩的岩性有关,提高围岩内摩擦角和内聚力是增大围岩强度的有效途径。通过分析煤层固化成孔的机理和数值模拟发现,高压注浆加固煤体可以增大孔壁围岩强度。现场对比试验表明:仿岩孔测压技术与岩孔测压差值为0.02 MPa,相对误差仅为3.85%,仿岩孔测压技术具有较好的可行性。
In the process of determining the gas pressure of the coal seam by using the coal hole, in order to fundamentally block the fissures around the borehole of the coal seam and solve the problem of deformation and collapse of the borehole in the coal seam, a method for determining the gas pressure of the rockfill is proposed. Mechanical analysis of failure of borehole shows that the radius of borehole fracture zone is related to the lithology of surrounding rock. Increasing the internal friction angle and cohesion of surrounding rock is an effective way to increase the strength of surrounding rock. Through analyzing the mechanism and numerical simulation of coal bed solidified into holes, it is found that high pressure grouting to reinforce coal can increase the strength of surrounding rock mass. The comparison of field tests shows that the difference between the rock pressure test and the rock pressure test is 0.02 MPa and the relative error is only 3.85%. The simulation technology of rock hole pressure measurement has a good feasibility.