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从紊流非达西流角度出发,利用压水孔水压、压水段长度、观测孔水压和流量等参水,推导出高水压条件下岩体渗透系数计算公式。结合某矿下组煤底板压水试验成果,分析了不同水流状态下计算的渗透系数的差异性,得出水流状态对岩体渗透系数计算的结果影响巨大,水压的变化引起岩体渗透性的剧烈变化。本文建议的渗透系数计算公式为裂隙岩体紊流状态下的非达西流渗透系数的计算提供了一种有效的方法。
Based on non-Darcy flow of turbulence, the calculation formula of rock mass permeability coefficient under high water pressure is deduced by using the pressure of water hole, the length of water pressure section, the water pressure and the flow rate of observation hole. Combined with the test results of the pressurized water test on the bottom of a coal seam in a coal mine, the differences of permeability coefficients calculated under different water flow regimes are analyzed. It is concluded that the influence of water flow conditions on the calculation results of rock mass permeability is huge and the change of water pressure causes the permeability of rock mass The dramatic changes. The proposed permeability coefficient calculation formula provides an effective method for calculating the permeability of non-Darcy flow in the condition of turbulent fractures.