Performance of a Deep Excavation and Its Effect on Adjacent Tunnels in Shanghai Soft Clay
Performance of a Deep Excavation and Its Effect on Adjacent Tunnels in Shanghai Soft Clay
复制标题
DOI：
10.1061/(asce)cf.1943-5509.0000891
复制
发表时间：
2016-12
影响因子：
2.5
通讯作者：
Guo-bin Liu;P. Huang;Jiangwei Shi;C. Ng
中科院分区：
文献类型：
--
作者：
Guo-bin Liu;P. Huang;Jiangwei Shi;C. Ng
摘要在上海软土地基上，在既有地铁车站一侧修建了一个长267 m、宽54 m、深14.9-16.4 m的三横墙多支撑深基坑。为了研究该深基坑开挖对邻近地铁车站和盾构隧道的影响，对地表变形和结构响应进行了广泛的监测。根据现场观测资料，分析了地下连续墙的挠度和竖向位移、地表沉降、车站及邻近盾构隧道上下线的竖向和水平位移以及隧道收敛等问题。在上海软土地基上，采用横墙、旋喷和大尺寸混凝土支撑后，实测的最大侧移和地面变形均比未设置横墙的场地小得多。最大开挖引起的侧墙位移和基坑后地表沉降均为0。
AbstractA 267-m-long, 54-m-wide, and 14.9–16.4-m-deep multipropped deep excavation with three cross walls in Shanghai soft clay was constructed at a side of an existing metro station. To investigate the performance of this deep excavation and the effect of this deep excavation on adjacent metro station and shield tunnels, the ground deformation and structure responses were extensively monitored. Based on the field observations, the deflections and vertical movements of diaphragm walls, surface settlements, vertical and horizontal displacements of the up track and the down track within the station and nearby shield tunnels, as well as tunnel convergence were extensively analyzed. By adopting cross walls, jet grouting and large dimension concrete struts, the measured maximum lateral wall deflection and ground deformation were much smaller than those at other sites without installing cross walls in Shanghai soft clay. The maximum excavation-induced lateral wall movements and ground settlement behind the reta...