某大型软土深基坑围护中多种支护技术的优化组合

Application of Optimal Combination of Multiple Support Techniques in a Large Deep Foundation Pit Support in Soft Ground

摘要:

根据基坑的地质条件、环境条件、基坑开挖深度等特点综合考虑，通过方案的对比、论证，采用了“深坑”化两道“浅坑”的设计思路，上坑采用复合土钉支护，下坑采用钻孔灌注桩加一道环形钢筋混凝土水平内支撑支护。该基坑工程所采用的多种支护技术的优化组合方案，安全可靠，经济合理，可为本地区同类超100 m深基坑工程设计提供借鉴。

Abstract:

Based on the geological condition, environmental condition, and the depth of excavation, by comparison and demonstration on the schemes, the design of one ‘deep foundation pit’ was changed into tow ‘shallow foundation pits’. The upper foundation pit was constructed with the composite support plan; the lower part was supported with bored grouting pile and an annular horizontal inner bracing reinforcement with concrete. This optimal combination of multiple support techniques was proved safe and economical, could be the reference to the similar design of ultra 100m depth excavations in the same area.