灰土褥垫层工作性能的数值模拟

Numerical Simulation on the Behavior of Lime-soil Cushion

结合CFG桩复合地基研究状况,利用ANSYS有限元程序,以数值分析的方法建立了CFG桩复合地基的整体弹塑性模型,分析了灰土褥垫层粘聚力和内摩擦角两个因素的变化对复合地基工作性能所产生的影响,得出:桩身应力沿深度变化的一个重要特征是其最大应力点不在桩顶,而是在桩顶下的某一深度处;随着灰土褥垫层粘聚力、内摩擦角、变形模量的增加,CFG桩复合地基的桩顶沉降量、桩顶应力值以及桩土应力比均增加,桩顶刺入量减小。

The numerical software-ANSYS was used in this paper to study the effect of cohesion and friction angle of lime soil cushion on the behavior of composite foundation, the conclusions can be drawn out as follows. The CFG composite foundation with lime-soil cushion or gravel cushion has the same stress relationship with depth along the pile body; with the increase of cohesion and friction angle of lime-soil cushion, the settlement and stress of pile head and the stress ratios of pile to soil increase while the penetration decreases.