钻孔常规压水和高压压水试验成果研究

摘要

In order to determine the change law of permeability of rock mass under different pressure a series of both borehole routine water pressure tests and high pressure water pressure tests were conducted for the rock masses in the high pressure bifurcation area of the Qiaongzhong pumped -storage power plant .The difference in the test results between the routine water pressure test and the high pressure water pressure test was deeply discussed by comparison and analysis of the test results .The study results show that the permeability coefficient of the fissured rock mass under high pressure is far exceeds that under conventional pressure .What’s more, the borehole acoustic sounding video recording data analysis reveals that the change law of permeability of rock mass is closely related to distribution of fissures of rock mass , to connection and opening of the fissures .%为了确定岩体在不同压力作用下渗透特性的变化规律，琼中抽水蓄能电站针对高压岔管区岩体做了一系列钻孔常规压水和高压压水试验。通过对试验结果进行对比分析，常规压水和高压压水两种不同条件下钻孔压水试验结果的差异性。研究结果表明，裂隙岩体在高压作用下的渗透系数远远大于常规压力作用下的渗透系数。同时结合钻孔声波录像资料分析，结果表明岩体渗透特性的变化规律与岩体裂隙分布以及裂隙连通性、裂隙开度等密切相关。