基于ABAQUS软件的大直径桩承载力-变形分析

土的弹塑性本构模型分别采用扩展Drucker-Prager模型和Mohr-Coulomb模型,桩-土接触面采用主从接触面模型,利用ABAQUS软件,对两根大直径桩的静载荷试桩结果进行了三维有限元数值模拟,结果表明:当土的内摩擦角Φ≤22°时,采用扩展Drucker-Prager模型较Mohr-Coulomb模型更好地模拟出大直径单桩竖向荷载作用下的荷载-沉降关系曲线;但当Φ＞22°时,Mohr-Coulomb模型也能很好地模拟出大直径单桩的荷载-沉降关系曲线.

Analysis of Bearing Capacity-Deformation of the Large Diameter Pile by The ABAQUS Software

In this paper,the extended Drucker-Prager model and Mohr-Coulomb model have been adopted as the elasto-plastic constitutive models of the soil and the master-slave contact surface model for the pile-soil contact surface.Using the ABAQUS software,the static load testing results of two large diameter piles have been simulated by the three-dimensional finite element numerical method.The results show that for simulating the load-settlement curves of the large diameter pile foundation the extended Drucker-Prager constitutive model is better than Mohr-Coulomb model under the vertical load,when the friction angle of soil is less than or equal to 22 degree;And the Mohr-Coulomb model has also good simulation result,when the friction angle is larger than 22 degree.