基于耦合欧拉-拉格朗日法的锚板在黏土中的极限承载力数值分析

发布时间：2018-12-14 19:29

【摘要】：当结构在土体中运动时,往往导致土体发生较大的变形,此类问题采用大变形数值分析方法更为恰当。耦合欧拉-拉格朗日(Coupled Eulerian-Lagrangian,简称CEL)法是大变形数值分析方法中的一种,在分析大变形问题时具有很强的适用性,但在国内尚未开展CEL法分析锚板承载力的研究。以方形锚板在均质土及线性土中的拔出试验为原型,基于CEL法建立数值模型,对锚板的极限承载力及破坏机制进行研究,并通过用户自定义子程序,实现了线性土的强度分布随锚板拔出而变化。计算结果表明,土体杨氏模量越大,锚板的极限承载力越大;随着位移增大,锚板的抗拔力先增大,后降低;当埋深小于临界埋深时,土体发生整体破坏;当埋深大于等于临界埋深时,土体发生局部破坏。数值计算反映的规律与试验结果基本吻合,体现了CEL法模拟锚板在海床中大位移响应的出色能力。
[Abstract]:When the structure moves in the soil, it often leads to the larger deformation of the soil, so it is more appropriate to use the numerical analysis method of large deformation for this kind of problem. The coupled Euler-Lagrangian (CEL) method is one of the numerical analysis methods for large deformation, which has strong applicability in the analysis of large deformation problems. However, the study on the bearing capacity of anchor plates by CEL method has not been carried out in China. Based on the pull-out test of square anchor plate in homogeneous soil and linear soil, the numerical model is established based on CEL method. The ultimate bearing capacity and failure mechanism of anchor plate are studied, and the user-defined subroutine is used to study the ultimate bearing capacity and failure mechanism of the anchor plate. The strength distribution of the linear soil varies with the pull out of the anchor plate. The results show that the larger the Young's modulus of soil is, the greater the ultimate bearing capacity of anchor plate is; with the increase of displacement, the tensile strength of anchor plate first increases and then decreases; when the buried depth is less than the critical depth, the whole soil failure occurs. When the buried depth is greater than or equal to the critical burial depth, the local failure of the soil occurs. The numerical results are in good agreement with the experimental results, which shows the excellent ability of the CEL method to simulate the large displacement response of the anchor plate in the seabed.
【作者单位】：天津大学建筑工程学院;
【基金】：天津市应用基础与前沿技术研究计划重点项目(No.14JCZDJC39900) 国家自然科学基金资助项目(No.51179124)~~
【分类号】：TU470

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