Upper bound analysis of rectangular surface footings on clay with linearly increasing strength
Upper bound analysis of rectangular surface footings on clay with linearly increasing strength
复制标题
强度线性增加的粘土上矩形表面基础的上限分析
DOI：
10.1016/j.compgeo.2020.103896
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发表时间：
2021
影响因子：
5.3
通讯作者：
C.F. Leung
中科院分区：
文献类型：
--
作者：
Sen Li;Jian Yu;Maosong Huang;C.F. Leung
采用数值上限法对强度线性增长的不排水粘性土地基上矩形表基础的极限承载力问题进行了综合分析。对于均匀土，本文的结果与已有的结果基本一致，并在三维效应占主导地位时给出了最佳的上限预测。得到的非均质土的承载力系数随宽长比的增大而减小，与均质土的承载力系数完全不同。相应地，形状因子也随着强度不均匀性而发生很大变化。根据下伏速度场分析了可能的原因。最后，提出了一个基于条形基础的矩形基础竖向承载力设计公式。
The ultimate bearing capacity problem of rectangular surface footing over undrained clay with linearly increased strength is comprehensively analyzed with a numerical upper-bound method. For uniform soil, the present results are generally in accordance with available results and present the best upper-bound prediction when the three-dimensional effect is predominant. The obtained bearing capacity factor for nonhomogeneous soil decreases with the increase of width-length ratio, totally different from that of uniform soil. Accordingly, the shape factor also varies greatly with strength nonhomogeneity. Possible reasons are discussed based on the underlying velocity field. Finally, a strip footing based design equation considering such effect is proposed for the vertical bearing capacity of rectangular surface footings.
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