摘要
基于Goodman接触界面模型,通过设定桩土极限剪切位移Δ,运用Coulomb剪切强度理论,得到了剪切刚度随深度的变化规律。并运用该改进界面模型对桩侧摩阻力变化情况及其异化效应进行了数值分析,结果表明异化效应尤其是强化效应的确存在,但其发生及量级主要与桩端条件,即桩底沉渣厚度有关,而桩端岩土性质的改变对强化效应的影响不大。梅耶霍夫深基础破坏模型能够在一定程度上解释桩侧摩阻力的强化效应,但存在局限性,需要对之进行更加深入的研究和探讨。
Based on the Goodman contact interface model,and setting the ultimate shear displacement Δ,using Coulomb shear strength theory,the variation of shear stiffness with depth was gotten. A numerical experimental investigation was performed on the variation law of pile skin friction and its abnormal effect by this improved contact interface model. The result show that the abnormal effect especially the enhancement effect exists in faith,but its emerging and magnitude are related to the condition of pile tip that is the depth of sediment. The effect of property of rock-soil mass under pile tip to the enhancement of shear stress can be neglected. The Meyerhof deep foundation failure model can explain the enhancement effect of skin friction to some extent,and has limitation. Further researches and discussion are needed.
出处
《工业建筑》
CSCD
北大核心
2014年第S1期661-665,共5页
Industrial Construction
关键词
钻孔桩
桩-土界面
桩侧摩阻力
异化效应
bored pile
interface between pile and soil
skin friction
abnormal effect
