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分别采用Lade Duncan模型和刚 塑性薄单元模型模拟土体的弹塑性和桩土界面的相对运动 ,对竖向受荷群桩进行了三维弹塑性有限元分析。研究表明 :大、小桩距群桩的承载性状有明显差异 ,大桩距群桩侧摩阻力存在“沉降软化”现象 ,不同于小桩距群桩的“沉降硬化” ;增大桩距有利于调动台底土参与工作 ,提高承台分担比 ;随荷载增大 ,各桩荷载趋于均匀分布
The Lade Duncan model and the rigid plastic element model are respectively used to simulate the elasto-plastic behavior of soil and the relative motion of pile-soil interface. The three-dimensional elasto-plastic finite element analysis is carried out on vertically loaded pile groups. The results show that there is a significant difference in the bearing characteristics of pile groups with large and small pile groups, and the phenomenon of “settlement softening” exists in the side friction of pile group with large pile spacing, which is different from “settlement hardening” of pile groups with small pile spacing; Which will help to mobilize the subsoil to participate in the work and enhance the sharing ratio of the caps; as the load increases, the load of the piles tends to be evenly distributed