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以武汉地区长江一级阶地上深厚软土中某超大深基坑支护工程为例,提出了“大坑化小、分区(段)设计、轻重结合、组合支护”的设计理念。根据基坑工程地质条件及施工部署,综合采用了卸土减载、桩撑、双排桩、坑内被动区加固等多种支护结构形式,并进行合理的平面组合和空间结合,既保证了基坑支护结构及周边环境安全和经济,又实现了土方及地下室结构的便捷施工,可为类似基坑工程的设计与施工提供参考。
Taking the support project of a large deep foundation pit in the deep soft soil of the first terrace of the Yangtze River in Wuhan as an example, the design concept of “small pit, small section, section design, light weight and combined support” was put forward. According to the engineering geological conditions and construction and deployment of the foundation pit, a variety of support structure forms such as unloading and deloading, pile support, double-row piles and passive area in the pit are comprehensively adopted and reasonable combination of plane and space are ensured The foundation pit supporting structure and the surrounding environment are safe and economical, and the convenient construction of earthwork and basement structure is realized, which can provide reference for the design and construction of similar foundation pit engineering.