静压桩挤土效应数值模拟及影响因素分析

针对目前数值模拟在静压沉桩挤土效应方面存在的问题，给出了符合压桩实际的有限元模型.该模型采用有限变形理论及土体的屈服准则，并通过桩土界面的接触及施加位移荷载来实现压桩过程.运用得到的有限元模型对静压桩产生的位移场进行了分析，分别给出了桩土模量比、桩土界面的摩擦特性及土的泊松比对沉桩位移场的影响规律.结果表明，沉桩的挤土效应不仅与土的工程性质有关，还与桩土相互作用面的性质密切相关.

Numerical simulation and factor analysis of jacked pile compacting effects

Some problems were proposed that numerical simulation cannot be effectively applied to jacked pile. A rational finite element model that accorded with the actual process of jacked pile was put forward. This model used finite deformation theory and constitutive model of soil. The penetration process of the pile was simulated through the contact between pile and soil and displacement loading. Displacement fields were researched through the finite element model. The effects of displacement fields caused by different modulus ratio, friction between pile and soil and poisson ratio of soil were given. The results show that the soil property and interacting surface properties between pile and soil are important influence factors in the compacting effect of jacked pile.