饱和软黄土地层深基坑支护与降水施工技术

Construction Technology of Deep Foundation Excavation Support and Dewatering in Saturated Soft Loess Stratum

以西安市某医院改造项目深基坑工程为背景,对饱和软黄土区域基坑支护设计及施工时遇到的问题进行了分析总结,并提出了相应的处理措施。介绍了设计以及施工过程中基坑深度调整应采取的设计对策,提出优先采用刚度较大的咬合桩止水帷幕原则,同时强调了“分层开挖、分层支护、严禁超挖”的重要性。

Based on the deep foundation excavation project of a hospital reconstruction project in Xi’an,the problems encountered in the design and construction of the foundation excavation support in the saturated soft loess area are analyzed and summarized,and the corresponding treatment measures are put forward.The design countermeasures to be taken in the design and construction process of foundation excavation depth adjustment are introduced,and the principle of giving priority to the use of secant pile waterproof curtain with larger stiffness is proposed.Meanwhile,the importance of“layered excavation,layered support and strict prohibition of over⁃excavation”is emphasized.