Design and practice of large-scale deep excavations in deep soft soils
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摘要: 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。Abstract: An excavation located in 1st terrace near Yangtze River in Wuhan City is taken as an example. The design concept of large scale being divided into small, segment design, severity and combined bracing is put forward. According to engineering geological conditions and construction deployment, different retaining structures such as pile-strut, double-row piles and reinforcement in passive zone are combined reasonably both in the plane and space, respectively. It achieves the convenience of earthwork and basement construction under the premise of safety and economy of supporting structures and surrounding environment. It may provide a good reference for other similar projects.
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