地下连续墙技术在多布水电站软基开挖中的应用

Application of Underground Continuous Wall in Soft Foundation Excavation,Duobu Hydropower Station

多布水电站基础为巨厚砂砾石地基,地下水量丰富,对基础开挖及混凝土浇筑有着较大的影响。文章以西藏多布水电站集水井基础开挖工程为背景,介绍了地下连续墙支护加固软土地基深基坑边坡的施工工艺,采取"先围后挖,降排结合"的方式,取得了软土地基深基坑开挖的良好效果,顺利完成电站在地下涌水量大、基坑深度大的软土地基开挖及混凝土浇筑,并对加固效果进行了检测分析和探讨,取得的工程经验可为类似工程施工借鉴。

The foundation of Duobu Hydropower Station in Tibet is of the largely thick sandy gravel one. In the foundation, groundwater is abundant, which largely impacts foundation excavation and concrete placement. With case of the sump foundation excavation of Duobu Hydropower Station in Tibet, the construction technology of the underground continuous wall supporting the foundation pit slope of the deep and soft foundation is introduced. The construction method of supporting the foundation area before excavation and of combining de- watering and drainage is applied. The deep foundation pit in soft foundation is excavated successfully. And the concrete placement in the foundation where underground water surge is in a large quantity and the foundation pit is deep is performed smoothly. The support effect is inspected and analyzed. The engineering practice experience provide the similar projects with reference.