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黏土地基中土体强度的非均质和各向异性是比较突出的现象。在已有工作的基础上,根据目前常用的不排水条件下饱和黏土非均质和各向异性强度模型,采用已被证实计算光滑条基极限承载力相当高效的多块体离散模式,编制了考虑强度非均质和各向异性时黏土地基上光滑条基地基承载力计算的多块体上限解计算程序,实现了非均质各向异性黏土地基上光滑条基地基极限承载力的多块体上限解法。为验证多块体上限解法的应用情况,将计算结果与已有的上限解、滑移线解等做了广泛的对比发现,该处计算非均质和各向异性黏土地基上光滑条基极限承载力的上限方法是相当有效的。为方便应用,基于多块体上限方法给出了非均质和各向异性条件下地基承载力系数Nc′的计算曲线。探讨了Nc′随土体强度非均质和各向异性的变化规律。通过分析非均质条件对地基破坏面的影响,揭示了非均质对地基承载力影响的内在原因。
The heterogeneity and anisotropy of soil strength in clay foundations are prominent phenomena. Based on the existing work, according to the commonly used non-drained saturated clay anisotropy and anisotropy strength model, the multi-block discrete mode that has been proved to be very efficient in calculating the ultimate bearing capacity of smooth strip base is compiled. Considering the calculation of the upper limit solution of multi-block for calculating the bearing capacity of smooth strip foundations on clay foundation with anisotropy of strength, the ultimate bearing capacity of smooth strip foundations on heterogeneous anisotropic clay foundation is realized. Body upper solution. In order to verify the application of the multi-block upper-bound solution, the results of the calculation are widely contrasted with the existing upper-bound solutions and slip-line solutions. The results show that the calculation of the smooth block-based limit of heterogeneous and anisotropic clay foundations The upper limit of bearing capacity is quite effective. For the convenience of application, the calculation formula of bearing capacity coefficient Nc ’of foundation under heterogeneous and anisotropic conditions is given based on multi-block upper bound method. The variation of Nc ’with soil heterogeneity and anisotropy was discussed. By analyzing the influence of heterogeneous conditions on the damaged surface of foundation, the inherent causes of heterogeneity affecting the bearing capacity of foundation are revealed.