Observed Behaviors of a Long and Deep Excavation Constructed by Cut-and-Cover Technique in Shanghai Soft Clay
Observed Behaviors of a Long and Deep Excavation Constructed by Cut-and-Cover Technique in Shanghai Soft Clay
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DOI：
10.1061/(asce)gt.1943-5606.0000553
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发表时间：
2012
影响因子：
3.9
通讯作者：
Yong Tan;Bin Wei
中科院分区：
文献类型：
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作者：
Yong Tan;Bin Wei
在上海大都市区内，采用切覆法在高层建筑和公用设施较多的软粘土中开挖了一个深16-18米、面内尺寸约为20米宽、290米长的地铁车站。为了研究这种深基坑的性能及其对邻近建筑物和公用管道的相关影响，在施工期间进行了长期综合仪器程序。现场观测包括连续墙的挠度、墙顶的垂直移动、地面沉降以及周围建筑物和公用设施的沉降。对现场数据的分析表明，过度开挖（即挖土量超过设计）和施工时间过长导致连续墙产生了很大的挠度。基底和中间楼板对抑制开挖后墙体挠度和地面沉降起主导作用。这次挖掘总体上表现出不同的行为……
A 16–18 m deep excavation for a metro station with in-plane dimensions of approximately 20 m wide by 290 m long was constructed by using the cut-and-cover technique in soft clay in the Shanghai metropolitan area, in which many high-rise buildings and utilities exist. To investigate the performance of this deep excavation and the associated effect on the adjacent buildings and utility pipelines, a long-term comprehensive instrumentation program was conducted during construction. Field observations included deflections of diaphragm walls, vertical movements at wall tops, ground settlements, and settlements of surrounding buildings and utilities. Analyses of field data indicated that overexcavation (i.e., removing more soil than designed) and a long construction duration caused the diaphragm walls to develop substantial deflections. The base and middle floor slabs played dominant roles in suppressing postexcavation wall deflections and ground settlements. This excavation in general exhibited different behavi...