土石坝下伏基岩交错断层导水示踪研究

 截至2007年，深圳一水库实际渗漏量是设计渗漏量的10倍，渗流情况非常复杂。为找出渗漏量偏大的原因并确定渗漏通道的位置，运用综合分析法研究坝体的渗流情况。首先采用示踪法得到坝体温度场和流速场，找出渗漏异常区；其次通过温度异常区和测压管资料分析，得出渗漏区主要处于基岩中，并存在集中渗漏通道的可能；最后综合水库水文地质条件以及坝体施工过程，确定土石坝下伏基岩交错断层为渗漏主通道，在此基础上建立水库渗漏概念模型。综合分析方法能克服单一方法的多解性，是水库渗漏探测的有效方法，具有一定的工程意义。

STUDY OF CONDUCTED WATER TRACER OF INTERSECTING FAULT OF LOWER BEDROCK OF EARTH-ROCK FILL DAM

The seepage amount of one reservoi in the city of Shenzhen is about ten times of designed one till 2007,and the seepage condition is rather complex. In order to find out the reason of seepage and ascertain the position of seepage passage,seepage condition of the dam was analyzed. Firstly,the tracer was used to investigate temperature field and velocity field of the dam,and then the abnormity seepage area was found. Secondly,according to the abnormity seepage area and data of the piezometric tube,it is clear that seepage occurred in lower bedrock,and it happened to be a concentration passage. Finally,combining with the geological conditions and construction situations,it is confirmed that the intersecting fault in lower bedrock of earth-rockfill was the main concentrating seepage passage,and the concept seepage model of dam was established. The comprehensive analysis is an effective way to investigate the dam seepage,which can avoid using single method and has a certain engineering significance.