胜利水库大坝除险加固安全复核及防渗处理实践

Safety check and seepage prevention treatment practice of Shengli Reservoir dam

针对胜利水库均质大坝防洪标准偏低、下游坝坡大面积沼泽化、坝体局部冒水翻沙渗漏等问题,根据钻芯取样和安全鉴定分析成果,结合大坝病险现状及坝型结构,优选坝顶培厚增高0.7m与冲抓套井回填黏土相结合的除险加固方案。渗流分析软件计算表明:按该方案进行加固处理后,大坝渗流稳定性和抗滑稳定性均满足规范指标要求,大坝整体渗透系数明显降低,防渗合格率达100%,大坝防洪标准得到提高的同时有效解决了大坝渗漏问题,除险加固效果明显。

in view of the problems in Shengli Reservoir homogeneous dam, such as lower flood flood control standard,downstream dam slope swamping for large area, dam local water seepage, founding, leakage, etc. The present situation of the damand dam type structure are combined to select the following risk removal and reinforcement plan according to the core sampling and safety appraisal analysis results: the dam crest is thickened for 0.7m, and it is combined with percussion and grabbingcasting wellbackfilling clay. It is obvious through seepage analysis software calculationthatthe dam seepage stability and anti-sliding stability can satisfy the requirements of specification indexesafter reinforcement according to the plan, thereby significantly lowering permeability coefficient of the dam as a whole, the pass rate of seepage prevention is 100%, the dam flood control standard is improved, the problem of dam leakage is effectively solved, and the consolidation effect is obvious.