静压桩沉桩阻力现场试验与数值模拟分析

Field Test and Numerical Simulation Analysis on the Penetration Resistance of Jacked Pile

为研究层状土中静压桩沉桩阻力的变化规律,通过选取聊城两处静压桩工地进行现场沉桩试验,成功监测了沉桩阻力随贯入深度的变化规律,并结合ABAQUS数值模拟软件,考虑土体接触面类型和初始地应力的影响,建立了层状土中静压桩贯入实体模型,实现了静压桩贯入过程的模拟计算,明确了层状土中静压桩桩端阻力的变化规律。研究结果发现:桩端位于黏性土层中,沉桩阻力随沉桩深度增加而变化较小,当桩端位于粉土、粉砂层时,沉桩阻力迅速增大;进一步阐明了不同深度下的径向应力、竖向应力以及沉桩阻力的分布特征。研究结果为相似地层沉桩过程以及工程实践提供了理论指导。

In order to study the variation law of jacking force in layered soil,the pile penetration test was carried out by selecting two jacked pile projects in Liaocheng,and the variation law of jacking force with penetration depth was successfully monitored,and combined with ABAQUS numerical simulation.The software,considering the influence of soil contact surface type and initial crustal stress,established the jacked pile penetration model in layered soil,realized the simulation calculation of the jacked pile penetration process,and clarified the variation of jacking force in the layered soil.The results show that the pile end is in the cohesive soil layer,and the jacking force changes less with the increase of penetration depth.When the pile end is in the silt and silt layer,the jacking force increases rapidly;Radial stress,vertical stress and distribution characteristics of pile resistance at different depths.The research results provide theoretical guidance for similar pile penetration processes and engineering practices.