论文部分内容阅读
现场压水试验是揭示深部岩土工程中岩体渗透性能的可靠方法,为探究深部煤层底板岩体的渗透性,采用钻孔高压压水测试手段,对兖州矿区某矿下组煤底板三段岩体进行了现场压水试验,获得了大量压水测试数据。结合渗透系数计算公式,对试验数据进行了分析,获得了不同深度及不同岩性岩体的渗透系数值及渗透系数与压力关系的概化模式。研究结果表明:岩体发生渗流时,测试水压和流量会发生突变。岩体的渗透系数-压力关系曲线在几何形态表现出明显的分段性,即可分为突变点前的平稳段和突变点后的线性变化段。压水结束后,岩体裂隙会发生闭合,且仍具有较强的抗渗性。
The on-site water pressure test is a reliable method to reveal the permeability of rock mass in deep geotechnical engineering. In order to explore the permeability of rock mass in deep coal seam, The rock mass was subjected to the pressure test on site and a large amount of water pressure test data was obtained. Combined with the calculation formula of permeability coefficient, the experimental data are analyzed and the generalized modes of the relationship between the permeability coefficient and the hydraulic conductivity of rock mass with different depths and different lithologies are obtained. The results show that there is a sudden change in water pressure and flow rate when rock mass seepage occurs. The permeability coefficient-pressure curve of rock mass shows obvious segmentality in the geometric shape, which can be divided into the steady-state section before the change point and the linear change section after the change point. After the water pressure is over, the cracks in the rock mass will close and still have strong impermeability.