摘要
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。
The conventional water pressure test results can not reflect the permeability of rock mass of the actual water pressure,for head buried deep underground construction works of the dam.In order to determine the rock permeability under different pressures,the three drilling high water pressure test is conduced in the bifurcation area of Huhehaote pumped storage power station.By studying the pressure-flow curve and the rock permeability rate Lu value to study the rock permeability,the experiment is carried out with five phase and three pressure stages,the pressure stages are designed as 1,3 and 5 MPa.35 typical segments are selected to carry out high water-pressure test and length of each segment is 5 meters.The results show that the test is characterized by micro-porous-low permeable rock,high water pressure test can reflect the variation law of rock permeability.
出处
《工程勘察》
CSCD
北大核心
2011年第8期55-59,共5页
Geotechnical Investigation & Surveying
关键词
抽水蓄能电站
高压压水试验
岩体透水率
pumped storage power station
high water pressure test
rock permeability rate
