嵌岩桩承载特性三维有限元分析

Three dimensional finite element analysis of load-bearing characteristics of rock socketed pile

本文主要研究桩岩不同无量纲参数下嵌岩桩的定量承载特性,通过建立嵌岩桩-土接触三维有限元模型,并与试验做了比较,验证了有限元模型的正确性,用有限元软件模拟计算和分析了嵌岩桩单桩承载力特性,给出了嵌岩桩轴力变化规律与沉降随外荷载的变化规律。研究表明:桩长、桩径和嵌岩段深度是影响嵌岩桩土层侧摩阻力及沉降的主要因素,桩长径比越大,桩周侧摩阻力分担的荷载越大;嵌岩深径比越大,桩沉降越小,结果为桩基的设计与施工提供指导。

This paper is focused on the quantitative analysis of rock socketed pile under different dimensionless parameters.A three dimensional finite element model of rock socketed pile was built and load-bearing capacity was analyzed.An experiment validated the simulation of finite element model.The dependence of the axial force on the buried depth and the relation between pile settlement and loads were obtained.The simulation demonstrates that the length of pile,the diameter of pile and the depth of rock socketed part mainly contribute to the side friction resistance of rock socketed pile.The bigger the length-diameter-ratio of the pile is,the more loads the pile side undergoes;the larger the depth-diameter-ratio of rock socketing is,the smaller the settlement of the pile is,and this can provide the guidance for the design and construction of pile and recheck the settlement and load-bearing capacity for the pile.