为研究混凝土坝体渗漏探测技术,以某水利枢纽工程混凝土重力坝裂隙式渗漏为研究对象,采用伪随机流场法探测渗漏入水口;采用钻孔及钻孔测试技术(温度测井、声波测井、钻孔电视观察、压水试验等)定位渗漏通道。研究结果表明:①当坝外有明显渗漏出水口时,伪随机流场法可以精确圈定坝内渗漏入水口;②坝体裂隙一般垂直坝体方向分布(如连接横缝)或沿坝体方向分布(如水平缝),或者两者皆有且连通;③坝顶钻孔及钻孔测试方法能够查明渗漏通道的高程及桩号分布范围。针对混凝土坝体裂隙式渗漏,采用伪随机流场法和钻孔测试技术综合探测,具有准确、快速、便捷、安全的特点,对于其他类似工程问题有一定借鉴意义。

Comprehensive detection technologies are applied in this research to detecte crack leakage of a concrete gravity dam. The leakage inlet is detected by using pseudo-random flow field method, and the range of leakage channel is located by drilling and drilling test technologies including temperature logging, acoustic logging, borehole television observation, water pressure test, and so forth. Results demonstrate that: 1) pseudo-random flow field method could precisely delineate the scope of leakage inlet in the dam in the presence of obvious leakage outlets; 2) cracks in the dam body generally distribute vertical to the direction of the dam body (such as connecting transverse joints) or along the direction of the dam body (such as horizontal joints), or both of them are connected; 3) drilling on dam crest and borehole test method are effective in identifying the elevation and pile number distribution range of leakage channel. The comprehensive detection methods integrating pseudo-random flow field method and borehole testing technology are accurate, rapid, convenient, and safe in detecting the crack leakage of concrete dam, thus can be taken as reference for similar engineering problems.