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通过编制能正确反映复合地基各种相互作用的三维非线性有限元 -无界元耦合程序 ,采用线弹性模型和Duncan -Chang非线性本构模型 ,分析了褥垫层在复合地基中的作用 ,并讨论了有褥垫层时桩体刚度、桩长的变化对复合地基桩身应力分布的影响 ;在此基础上 ,给出了桩体刚度对承台下桩土应力扩散规律的影响 .所得结果对工程实际践指导意义
Based on the linear elastic model and the nonlinear constitutive model of Duncan-Chang, the effect of cushion on the composite foundation is analyzed by compiling a three-dimensional nonlinear finite element and unbounded element program that can correctly reflect the interaction of composite foundation. The effect of pile stiffness and pile length on the stress distribution of composite foundation is discussed. On the basis of that, the influence of pile stiffness on the stress and dispersion of pile-soil under pile cap is given. Practice guiding significance to the project