Measured performance of a 26 m deep top-down excavation in downtown Shanghai
Measured performance of a 26 m deep top-down excavation in downtown Shanghai
复制标题
上海市中心 26 m 深自上而下开挖的实测性能
DOI：
10.1139/t10-100
复制
发表时间：
2011-05-01
影响因子：
3.6
通讯作者：
Li, Mingwen
中科院分区：
文献类型：
--
作者：
Tan, Yong;Li, Mingwen
通过长期的综合测试方案，对上海市中心26m深的逆作法地铁车站的开挖进行了广泛的检测。实测的开挖响应包括地下连续墙的挠度、墙体的沉降量、地面沉降量、内部钢柱的上浮、支撑支柱的轴力、地下水位以及邻近建筑物和公用管线的沉降量。通过对现场资料的分析，得到以下主要结论：(1)混凝土支撑和底板有效地抑制了后期墙体的移动，从而减少了墙体最大挠度出现在开挖面以上的可能性；(2)随着开挖深度的加深，地下连续墙经历了锯齿状的沉降模式；(3)开挖后墙体没有明显的挠度；(4)内柱上浮与墙体最大挠度之间的关系；(4)随着开挖深度的增加，地下连续墙呈锯齿状沉降。
Via a long-term comprehensive instrumentation program, the performance of a 26 m deep metro station excavation constructed by the top-down method in downtown Shanghai was extensively examined. The measured excavation responses included diaphragm wall deflections, wall settlements, ground settlements, uplifts of interior steel columns, axial forces of propping struts, groundwater table levels, and settlements of adjacent buildings and utility pipelines. Based on the analyses of field data, the following major findings were obtained: (i) the concrete struts along with the floor slabs effectively suppressed later wall movements and consequently reduced the chance that the maximum wall deflections would occur above the excavation surfaces, (ii) with the progress of excavation to a lower depth, the diaphragm walls underwent a serrated settlement pattern over time, (iii) no significant post-excavation wall deflection occurred, (iv) the relationship between the interior column uplifts and the maximum wall deflec...