复杂场地条件下深基坑支护方案

摘要

The pit for the culvert of the fish way entrance is extremely large,beside which power station's typical buildings and Sanmenqu lock chamber are built,and the approaching road is built above the culvert.In view of the problems such as narrow construction site and multiple limitations, we study the type of the supporting structure and corresponding application conditions.Conducting the detailed design of the brace type structure, double-row pile type structure, and the construction scheme of jacking box culvert, and carrying out the scheme comparison and selection based on the qualitative analysis and reviewing calculation, we determine to adopt the twin-bracing scheme for implementation.Meanwhile,the observation requirement and matters needing attention are also presented.%鱼道进口段暗涵结构基坑为特大型深基坑,两侧分别建有电站标志性建筑物和三门渠闸室,上部建有电厂进厂公路.针对施工场地狭窄、限制条件较多的问题,进行支护结构类型及适用条件的研究.对支撑式结构、双排桩式结构及箱涵顶进施工方案进行详细设计,采用定性分析与复核计算相结合的方法进行方案比选,确定采用对撑支护方案作为实施方案,同时提出施工期观测要求和注意事项.