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对于水库大坝、深埋地下工程等水头很高的工程,常规压水试验结果不能反映实际水头压力作用下岩体的渗透特性。为了确定岩体在不同压力作用下渗透特性的变化规律,在呼和浩特抽水蓄能电站高压岔管区专门做了3个钻孔高压压水试验。通过研究压力-流量关系曲线和岩体透水率Lu值了解岩体渗透特性。现场高压压水试验按三级压力、五个阶段进行。三级压力分别为1,3,5MPa,试验段长度取为5m,3个钻孔共取35个典型区段进行高压压水试验。试验结果表明,试验区属微透水-弱透水岩体,高压压水试验能很好地反映岩体透水性的变化规律。
For projects such as reservoir dams and deep underground engineering with high water head, the results of conventional water pressure test can not reflect the permeability characteristics of rock mass under the actual head pressure. In order to determine the law of permeability of rock mass under different pressures, three high-pressure hydraulic tests were made in the high-pressure bifurcation area of Hohhot Pumped Storage Power Station. By studying the pressure-flow relationship curve and Lu value of permeability of rock mass to understand the rock mass permeability characteristics. High-pressure water pressure test site by three pressure, five stages. Three pressure were 1,3,5 MPa, the length of the test section was taken as 5m, a total of 35 typical sections of the three drill holes for high pressure water test. The test results show that the test area belongs to the micro-pervious and weakly permeable rock mass. The high-pressure water pressure test can well reflect the change rule of rock permeability.