某水库左坝肩水工建筑物基础开挖处理研究

Study on Foundation Excavation Treatment of Hydraulic Structures at the Left Abutment of a Reservoir

某水库左坝肩集中分布多种水工建筑物,其工程地质分析评价结果显示,左坝肩基础开挖会存在坝坡小面积崩塌及坝基绕坝渗透等风险。通过选取典型断面进行边坡稳定及大坝渗流计算,进一步研究表明正常运用条件及非正常运用条件下,坝基整体稳定,坝体和坝基不会发生渗漏变形破坏,且出逸段渗透稳定满足要求。据此再结合不同水工建筑物的各自特点进行分级开挖、支护及灌浆等基础处理设计,能够保证基础开挖的稳定性。

a variety of hydraulic structures are concentrated at the left abutment of a reservoir.The engineering geological analysis and evaluation results show that the excavation of the left abutment foundation will lead to the risk of dam slope collapse in small area and dam foundation penetration around the dam.By selecting typical sections for slope stability and dam seepage calculation,further research shows that under normal and abnormal operation conditions,the dam foundation is stable as a whole,the dam body and the dam foundation will not leak deformation damage,and the seepage stability of the escape section meets the requirements.Based on this,combined with the characteristics of different hydraulic buildings,the foundation treatment design such as graded excavation,support and grouting treatment are carried out to ensure the stability of foundation excavation.