基于位移贯入法的静压沉桩有限元分析

基于ADINA平台，应用位移贯入法对静压沉桩的连续贯入的全过程进行有限元模拟，研究了均质土中静压沉桩产生的位移和应力的变化规律，并与成层土中静压沉桩产生的位移和应力进行了对比分析。有限元分析表明，在均质土中，随着径向距离的增加，土体的水平位移和挤压应力呈对数衰减，且与桩的贯入深度有关；在成层土中，成层土的影响比均质土的影响要大，主要体现在软硬土体分层处土体位移加大，土中挤压应力剧变，出现应力间断。在实际施工过程中，桩体易开裂、弯折，由此提出相应的解决方法。

Finite Element Analysis of Static Pressure Pile - Sinking Based on the Displacement Penetration Method

Based on ADINA, using the displacement penetration method, the complete process of successive penetration of static pressure pile - sinking was simulated with finite element method. This paper studied change law of displacement and the stress caused by static pressure pile in homogeneous soil. The paper also comparsen between the displacement and stress caused by stat- ic pressure pile in layered soil. The finite element analysis showed that with radial distance increasing, the horizontal displace- ment the compressive stress of the soil took a logarithmic decay in homogeneous soil, and was related to the depth of penetration of the pile. The effect of layered soil was larger than the homogeneous soil, and the effect was mainly reflected in that the soil＇ s displacement increases. Compression stress changes rapidly and discontinues at the boundary of soft soil and hard soil in layered soil. The pile is easy to crack and bend in practical engineering. At last, the methods for prevention are put forward.