【摘要】 简述了一个峰值后软化的水泥土应力-应变关系模型;将水泥土桩、土体、桩顶压载板及桩土接触面简化成有限元集合体;考虑水泥土峰值后软化性能对水泥土桩复合地基性能进行了三维非线性有限元分析.计算的荷载-沉降曲线与现场试验测得的曲线吻合良好,验证了该模型的适用性.分析结果初步揭示了峰值后软化水泥土桩复合地基工作机制及破坏形式,以及在水泥土桩复合地基性能研究中考虑水泥土峰值后软化特性的必要性.更多还原

【Abstract】 A stress-strain relationship of cemented soils featured by post-peak softening is presented.Cemented soil pile,soil,bearing plate on pile top and pile-soil contact surface are simplified as FEM system.Work behavior of composite foundation of cemented soil pile is studied by 3D non-linear FEM analysis applying post-peak softening model of cemented soil.The calculated load-settlement curve and that obtained from in-situ test are in good agreement,which verifies the model.The analysis results primarily show the work mechanism,failure mode of composite foundation of cemented soil pile and the necessity of considering post-peak softening of cemented soil in the analysis of composite foundation.更多还原