非均质性和各向异性黏土地基承载力上限分析

Upper bound analysis for the bearing capacity of the inhomogeneous and anisotropic clay foundation

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 bearing capacity of clay foundation is effected by the non-homogeneity and anisotropy of clays. Based on energy theory of limit analysis and discrete method,the equation of bearing capacity of foundation was deduced by establishing the corresponding discrete model which was similar to Prandtl model.Based on fortran calculation program of discrete method,the desired solution of bearing capacity of strip foundation in non-homogeneous and anisotropic clays was carried out. The case analysis shows that the results are basically consistent with other methods,and are good agreement with the experimental results. The parameter sensitivity analysis indicates that the bearing capacity of foundation are changed with different inhomogeneous coefficients and with different anisotropic coefficients,and the two relationships are linear approximately.