某新建水库坝基渗水及渗透变形研究

Water Seepage and Seepage Deformation of Dam Foundation Analysis for a New Reservoir

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。

Waergou reservoir is a new-built reservoir in recent years,but seepage always exists at the bottom of still⁃ing basin at downstream dam foot after the dam has been built.In order to find out the causes of dam foundation seep⁃age,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 ob⁃tained that the permeability rate in the impoundment period was less than the permeability rate in the construction pe⁃riod,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 ob⁃servation,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.