鲍吉泽 熊灿娟

摘 要：娃二沟水库为近年来新建的水库，大坝建成后，下游坝脚消力池底部一直存在渗水现象。为寻找导致坝基渗漏的原因，本文通过观测蓄水库水位和渗水点渗流变化量及坝体廊道渗水情况，排除消力池底部渗水点为坝基渗漏点;采取理论公式概略计算坝基透水率并与施工期坝基透水率进行对比，得出蓄水期透水率小于施工期透水率，大坝防渗帷幕满足要求，大坝渗水量符合防渗标准;通过分析坝基地质情况并结合渗水观测可知，坝基岩体无破坏情况发生，水库蓄水不存在影响大坝稳定的坝基渗透变形。

关键词：娃二沟水库;坝基渗水;渗透变形

中图分类号：TV223.4文献标识码：A文章编号：1003-5168（2020）16-0066-03

Abstract： Waergou reservoir is a new-built reservoir in recent years，but seepage always exists at the bottom of stilling basin at downstream dam foot after the dam has been built. In order to find out the causes of dam foundation seepage， this paper， through the observation of the water level and seepage change of seepage point of the impoundment and the seepage situation of the dam Gallery， eliminated the seepage point at the bottom of the stilling basin as the seepage point of the dam foundation; adopted the theoretical formula to roughly calculate the permeability rate of the dam foundation and compares it with the permeability rate of the dam foundation in the construction period， and obtained that the permeability rate in the impoundment period was less than the permeability rate in the construction period， and the seepage proof curtain of the dam according to the requirements， the seepage volume of the dam met the seepage control standard; through the analysis of the geological conditions of the dam foundation and the seepage observation， it could be seen that the dam foundation rock mass was not damaged， and the reservoir water storage did not have the seepage deformation of the dam foundation that affects the stability of the dam.

Keywords： Waergou reservoir;seepage of dam foundation;seepage deformation

娃二沟水库为近年来新建水库工程，位于毕节市赫章县古基乡，所在河流娃二沟小河属于长江流域乌江水系六冲河二级支流。该小河发源于赫章县古基乡桃源村祁家梁子，河源高程为2 155.3 m，水库位于古基乡桃源村的海子湾，坝址与古基乡相距约为4.5 km。该水库坝址控制流域面积为2.56 km2，水库校核洪水位为1 769.86 m，总库容为63.7万m2;正常蓄水位为1 768.00 m，相应库容为50.8万m2;死水位为1 755.50 m，相应库容为6.0万m2，兴利库容为44.8万m2。大壩为C15细石混凝土砌毛石重力坝，大坝长为107.0 m，坝顶高程为1 771.00 m，坝基置于弱风化基岩中上部，建基面高程为1 739.00 m，最大坝高为33.0 m，设计正常蓄水位为1 768.00 m。大坝建成后，下游坝脚消力池底部一直存在渗水现象，一开始怀疑是坝基帷幕灌浆存在质量问题，从而导致坝基渗漏的可能。……