论文部分内容阅读
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, by setting the limit shear displacement Δ of pile soil and using Coulomb shear strength theory, the variation law of shear stiffness with depth is obtained. Using the improved interface model, numerical analysis was performed on the change of frictional resistance of the pile and its dissimilation effect. The results show that the dissimilation effect, especially the strengthening effect, does exist, but its occurrence and magnitude are mainly related to the pile tip conditions, ie, the thickness of the bottom of the pile. Relevant, but the changes in the rock and soil properties at the pile end have little effect on the strengthening effect. Meyerhoff’s deep foundation damage model can explain the strengthening effect of pile side frictional resistance to a certain extent, but it has limitations and needs to be further studied and discussed.