Three-dimensional numerical analysis of deep excavations with cross walls
Three-dimensional numerical analysis of deep excavations with cross walls
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DOI：
10.1007/s11440-012-0181-8
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发表时间：
2012-07
期刊：
影响因子：
5.7
通讯作者：
P. Hsieh;C. Ou;Yi-Lang Lin
中科院分区：
文献类型：
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作者：
P. Hsieh;C. Ou;Yi-Lang Lin
先前对案例的平面应变分析表明，基坑中的跨墙可以有效减少深基坑引起的运动。本研究对4个不同跨墙安装方式的深基坑工程进行了三维数值分析，包括不同的开挖深度、跨墙间距和跨墙深度。将这 4 个案例中观察到的和计算出的墙挠度与假设未安装横墙的相同开挖的墙挠度进行了比较，以证明横墙在减少侧壁挠度方面的有效性。结果表明，横墙也具有与连续墙相似的角效应。连续墙的挠度在横墙安装位置处最小，然后随着距横墙距离的增加而增加，直至两横墙之间的中点。原位土性质、地下连续墙性质、施工程序、跨墙深度等许多因素都可能影响跨墙安装引起的侧墙挠度减少量。在相同条件下，减少量很大程度上取决于横墙的深度、到横墙的距离以及横墙的间距。
Previous plane strain analysis of a case history has shown that cross walls in an excavation can effectively reduce movements induced by deep excavation. This study performed three-dimensional numerical analyses for 4 deep excavation cases with different installations of cross walls, including different excavation depths, cross wall intervals and cross wall depths. Both the observed and computed wall deflections for the 4 cases were compared with those of the same excavations that were assumed with no cross walls installed to demonstrate the effectiveness of cross walls in reducing lateral wall deflections. The results show that the cross wall also had a corner effect similar to that of the diaphragm wall. The deflection of the diaphragm wall was smallest at the location of the cross wall installed and then increased with the increasing distance from the cross wall, up to the midpoint between two cross walls. Many factors such as in situ soil properties, diaphragm wall properties, construction procedure, cross wall depth and so on may affect the amount of reduction in lateral wall deflections due to the installation of cross walls. Under the same condition, the amount of reduction was highly dependent on the depth of cross walls, distance to the cross walls and the cross wall interval.