高压压水试验在深钻孔中的应用.pdf

第 26 卷第 10 期岩土力学
2005 年 10 月 Rock and Soil Mechanics Oct. 2005
文章编号:1000-7598-(2005) 10―1692―03


高压压水试验在深钻孔中的应用
殷黎明,杨春和,罗超文,王贵宾
(中国科学院岩土力学重点实验室,武汉 430071)

摘要:常规压水试验一般按三级压力、五个阶段进行。三级压力一般分别为 ,,1 MPa。但对于水库大坝、深埋地
下工程等水头很高的工程而言,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。试验在某花岗岩地区 500
m 深孔中进行,因此选定压力阶段为 2,4,6 MPa。试验段长度取为 m,钻孔中共取 21 个典型区段进行高压压水试验,
试验结果表明,高压压水试验能很好地反映岩体透水性的变化规律。该地区属低渗透岩体,因此在该地下工程灌浆处理裂隙
岩体时最小灌浆压力值应不小于 5 MPa。
关键词:高压压水试验;透水率;渗透系数;水力劈裂
中图分类号:TU 459 文献标识码:A


Application of high water-pressure test to deep borehole

YIN Li-ming, YANG Chun-he, LUO Chao-wen, WANG Gui-bin
(Key Laboratory of Rock and Soil Mechanics, Institute of Rock and Soil Mechanics, CAS, Wuhan 430071,China)

Abstract: Generally, conventional water-pressure test is always carried out with five phases and three pressure stages, , 6 MPa and
1 MPa. But for some Engineerings with high water pressure such as the dam and deep covered underground ones, the results of the
conventional water-pressure test can’t reflect the true permeability characteristic of the rock mass. The experiment is carried out in a
500m borehole of a granite region, and the pressure stages are designed as 2, 4 MPa and 6 MPa. 21 typical segments are selected to
carry out high water-pressure test and the length of each segment is seepage law of this area is obtained th