城市复杂环境下超长深基坑分部开挖研究

以深圳市滨海大道下沉隧道段超长深大基坑工程为依托,采用数值仿真手段对比分析不同基坑分部开挖工法对基坑围护结构和基坑周围土体的影响.研究结果表明:基坑坑中坑的开挖,增大了基坑围护结构变形,对基坑整体稳定具有控制性作用;基坑分部开挖时,应尽量减少开挖对基坑土体的扰动次数,降低围护结构及周围土体变形;在满足施工期路面交通的前...

Study on Partial Excavation of Super-long Deep Foundation Pit in Urban Complex Environment

Based on the super-long deep and large foundation pit engineering of the sinking tunnel section of Binhai Avenue in Shenzhen, the influence of different excavation methods on the retaining structure and soil around the foundation pit was compared analyzed by numerical simulation. The research results show that the excavation of the pit in the foundation pit increases the deformation of the retaining structure of the foundation pit, and has a controlling effect on the overall stability of the foundation pit. When the foundation pit is excavated by sections, the number of disturbance to the foundation pit soil should be minimized to reduce the deformation of the retaining structure and the surrounding soil. Under the premise of meeting the road traffic during the construction period, it is recommended to use the construction method of excavating three sub-pits at the same time, which not only improves the construction efficiency, but also may reduce the disturbance of the soil around the foundation pit.