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黏土所表现出明显的各向异性和非均匀性对地基承载力具有较大的影响.基于Prandtl型的地基破坏模式,采用离散法构建了地基破坏时的速度场模型,并以极限分析上限法为基础,推导出综合考虑非均质和各向异性的黏土条形地基承载力方程.在此基础上,采用fortran语言编制了离散法计算程序,得到了相应条件下条形基础地基承载力.通过算例分析表明,本文计算结果与其他方法的计算值是基本一致的,与试验结果也能得到较好的吻合.参数敏感性分析表明,地基承载力系数分别与土体各向异性系数和非均质性系数均近似呈线性的变化关系.
The obvious anisotropy and inhomogeneity of clay have a great influence on the bearing capacity of foundation.According to Prandtl-type foundation failure mode, the velocity field model of foundation destruction is constructed by discrete method, and the upper limit analysis method , The bearing capacity equation of the clay strip foundation considering the heterogeneity and the anisotropy is deduced.On this basis, the calculation formula of the discrete method is compiled by fortran language and the bearing capacity of the strip foundation under the corresponding condition is obtained. The results of numerical examples show that the calculation results of this paper are basically the same as those of other methods and can be in good agreement with the experimental results.Parametric sensitivity analysis shows that the coefficient of bearing capacity of foundation is related to the anisotropy coefficient and The heterogeneity coefficients are approximately linearly changing.