PCC桩复合地基褥垫层作用数值分析

褥垫层是PCC桩复合地基的重要组成部分。通过有限元数值模拟,探讨了PCC桩复合地基褥垫层刚度、厚度对桩土应力比以及沉降量的影响,得出桩长方向桩土应力比的分布规律。刚度和厚度是影响褥垫层流动调节能力的主要因素,随其刚度的增加或厚度的减小,桩土应力比增大,沉降减小。从桩顶到桩底,桩土应力比先增大后减小,验证了桩侧负摩阻区的存在,并分析了褥垫层刚度、厚度对该桩土应力比分布以及负摩阻区范围等的影响,得出了一些有益的结论。

Numerical analysis on cushion in PCC pile composite foundation

Cushion is one of the key parts of the composite foundation to keep pile and soil working together.Based on the numerical analysis with FEM,some useful conclusions about cushion were drawn.The results of analysis show that the stiffness and thickness of the cushion have effect on the settlement of composite foundation and the stress ratio of piles and soils.The distributing rules of the stress ratio of piles and soils were obtained.At the same time,according to the numerical calculation,both the stiffness and thickness of cushion have effect on the distributing rules.