直界水库前坝坡沉陷加固方案设计

Front Dam Slope Settlement Reinforcement Scheme Design in Zhijie Reservoir

摘要:

直界水库坝基下伏为寒武系~奥陶系白云质灰岩，岩溶发育，溶沟、溶槽发育的方向与大坝右端断裂引起的次生断裂走向基本一致。在运行过程中发生了危及大坝安全的大坝前坝坡局部沉陷的险情。文章从坝基、坝体工程地质条件及工程管理等方面，对上游坝坡沉陷的原因进行了分析，提出了坝基帷幕灌浆、坝体松散层充填灌浆结合的应急加固方案，取得了显著效果。

Abstract:

Under the dam foundation of Zhijie Reservoir, it is Cambrian ~ Ordovician dolomitic limestone, and the direction of karst development, dissolution channel and dissolution trough development is basically consistent with the secondary fault trend caused by the fault at the right end of the dam. In the course of operation, local subsidence of dam slope in front of dam occurred, which threatened the safety of dam. From the aspects of engineering geological conditions and engineering management of dam foundation and dam body, the paper comprehensively analyzed the causes of subsidence of upstream dam slope, and put forward an emergency reinforcement scheme combining curtain grouting of dam foundation and loose layer filling grouting of dam body, and achieved remarkable results.