压力洞室围岩的高压透水率测试技术与应用研究

STUDY OF HIGH PRESSURE PERMEABILITY MEASUREMENTS AND APPLICATIONS FOR PRESSURE TUNNELS

随着压力洞室、深埋地下工程的建设,迫切需要弄清工程所在深度上的岩体在高压作用下的透水性状。由于岩体中的节理、裂隙等各种软弱结构面在高压作用下将会张裂、扩展,只有按照等于或略大于洞壁围岩实际承受的压力进行高压透水测试,才能得到工程运行状态下岩体透水率的可靠资料。介绍了钻孔高压压水测试技术,并结合其在工程中的具体应用做了初步分析。

For the construction of pressure tunnels and underground projects in greater depth, it is necessary to understand the groundwater permeability of the surrounding rocks. Under high water pressure, various weak structures such as joints or cracks inside the rock mass may split or extend, which may lead to permeability change in turn. Therefore, it's necessary to measure the permeability of surrounding rock under pressures equal to or higher than the designed pressure magnitudes to obtain more reliable permeability information under normal project operation conditions. This paper presents a high pressure permeability measurement technique in boreholes and its application for pressure tunnels.