某水工隧洞裂隙岩体高水头作用下的渗透性试验研究

结合某抽水蓄能电站高压引水隧洞裂隙岩体的高压压水试验、常规压水试验和室内试验,分析了裂隙岩体在高水头条件下渗透流量与压力关系所反映的岩体渗透特性变化规律;在定量计算基础上探讨了裂隙岩体渗透系数与压力的相互关系。通过对比高压压水试验、常规压水试验和室内试验得到的渗透系数,分析了环境应力状态和压力变化对渗透系数取值影响的原因。研究结果表明,高水头作用下裂隙岩体的渗透系数明显大于低水压条件下的渗透系数,室内试验渗透系数因应力解除影响而大于原位压水试验渗透系数值。

Test study of osmotic behavior of fractured rock mass of water tunnel under high water pressure

Combined with high pressure permeability test, conventional pressure permeability test and indoor permeability test for fractured rock mass of high pressure water tunnel in one water-pumped storage power project, the variation law of rock mass permeability under high water pressure is analyzed to describe the relation between discharge and water pressure. Through the calculation of permeability coefficient of fractured rock mass, relation between water pressure and permeability coefficient is also discussed. By comparing the results of high pressure permeability test, conventional pressure permeability test and indoor permeability test, the environmental stress and water pressure state of rock mass are considered as the main factors influencing the permeability coefficient. The test results indicate that the permeability coefficients in high water pressure are obviously greater than ones in low water pressure state. It is also pointed out that the permeability coefficients in indoor test are greater than ones obtained from in situ test.