CFG桩竖向荷载作用下水平位移和弯矩的试验研究

通过室内模型桩试验 ,分析了竖向荷载对CFG桩的水平位移、桩身弯矩的影响。接着 ,运用三维有限元的方法 ,考虑了土体的弹塑性 (Prandtl-Reuss模型 ) ,以及在桩土界面处设置接触单元来考虑桩土的滑移和开裂 ,对模型桩进行了模拟分析。然后 ,通过现场原形实验 ,对分析结果进行验证。结果显示轴向荷载的存在对CFG桩产生附加弯矩和水平位移 ,但在试验荷载范围内影响很小。最后得出有一定参考价值的结论

A TEST STUDY ON THE LATERAL DEFLECTION AND BENDING MOMENT OF CFG PILES UNDER AXIAL LOADS

By means of a series of model tests, the main objective of the paper is to investigate the influence of axial loads on the lateral deflection and bending moment of CFG piles. The response of a single pile is simulated by means of three-dimensional finite element analysis, in which nonlinear soil behavior (Prandtl-Reuss model)is considered and pile-soil contact elements are employed for representing pile-soil slippage and separation.In-site prototype test is conducted to verify the model experiment and finite element analysis,the results indicate that axial loading with in the range of the experinent only indnces small lateral deflection and bending moment in CFG piles.