Upper-bound multi-rigid-block solutions for bearing capacity of two-layered soils
Upper-bound multi-rigid-block solutions for bearing capacity of two-layered soils
复制标题
DOI：
10.1016/j.compgeo.2008.10.001
复制
发表时间：
2009-04
影响因子：
5.3
通讯作者：
Maosong Huang;H. Qin
中科院分区：
文献类型：
--
作者：
Maosong Huang;H. Qin
极限分析法已广泛应用于包括地基承载力在内的岩土工程稳定性分析中。在极限分析中，为了改进地基承载力的计算，主要有两种方法。一种方法是将极限分析与有限元法和线性/非线性规划相结合。另一种方法是利用多刚体块机构来获得上限解。本文在Florkiewicz [Florkiewicz A.成层土承载力的上限。Can Geotech J 1989;26（4）：730-6.]计算地基承载力。特别注意了两层土壤上条形基础的承载力。为了验证改进机制的有效性，与其他知名的解决方案进行了比较。结果表明，改进了Michalowski和Shi给出的最佳多刚性块上限解[Michalowski RL，Shi L.双层地基上基础的承载力。J Geotech Eng ASCE 1995;121（5）：421-8.]，并与Shiau等人的有限元极限分析结果相当一致[Shiau JS，Lyamin AV，Sloan SW. Bearing capacity of a sand layer on clay by finite element limit analysis. Can Geotech J 2003;40（5）：900-15.]。
The limit analysis method has been widely used in the stability analysis of geotechnical problems including the bearing capacity of foundations. Two main approaches have been followed in the limit analysis to improve the calculation of the bearing capacity of foundations. One approach is to combine limit analysis with the finite element method and linear/nonlinear programming. The other is to use a multi-rigid-block mechanism to obtain an upper-bound solution. In this paper, the multi-rigid-block upper-bound method with a modified failure mechanism from that of Florkiewicz [Florkiewicz A. Upper bound to bearing capacity of layered soils. Can Geotech J 1989;26(4):730–6.] was employed to calculate the bearing capacity of foundations. Attention was paid particularly to the bearing capacity of strip footings over a two-layered soil. In order to verify the effectiveness of the modified mechanism, comparisons were made with other well-known solutions. The results showed improvements over the best available multi-rigid-block upper-bound solutions given by Michalowski and Shi [Michalowski RL, Shi L. Bearing capacity of footings over two-layer foundation soils. J Geotech Eng ASCE 1995;121(5):421–8.], and fair consistence with the results from the finite element limit analysis in Shiau et al. [Shiau JS, Lyamin AV, Sloan SW. Bearing capacity of a sand layer on clay by finite element limit analysis. Can Geotech J 2003;40(5):900–15.].