上海软土深基坑施工中各工序变形特性及控制

Deformation characteristics and control measures of each process in the deep excavation in Shanghai soft soil

随着基坑工程的积累,监测手段及监测数据的不断丰富,越来越多的实测数据表明水泥土加固、地下连续墙成槽、开挖卸荷等不同基坑施工阶段对周边环境均有一定程度的影响。为研究基坑施工过程中不同工况下周边土体变形的特性,选取上海软土地区较为典型的深基坑工程,对基坑工程周边环境的变形进行了全过程的监测,按照施工顺序,依次分析了不同工况下坑外地表隆沉的分布形式,总结了上海软土地区基坑工程的变形特征,并对基坑工程不同施工阶段的变形影响原因进行了分析。

With the accumulation of deep excavations in Shanghai soft area,monitoring data of deep excavations show that each process of excavation,include diaphragm wall construction,soil reinforcement and excavation unloading,have a certain influence on surrounding environment. The monitoring data of three deep excavations in soft soil area of Shanghai was collected. Based on the typical deep excavation cases,the measured deformation data in each process of excavation was analyzed. the characteristics of surrounding soil deformation in different construction stages were studied.