管-砂土横向相互作用中土体极限承载力

发布时间：2018-01-18 04:23

本文关键词：管-砂土横向相互作用中土体极限承载力　出处：《北京工业大学学报》2016年06期 　论文类型：期刊论文

【摘要】：为了解决国内外规范中关于管-土相互作用横向承载力系数取值方面存在不足的问题,基于Trautmann管-砂土横向相互作用试验,利用ABAQUS软件进行了相应的数值模拟.首先,利用模型试验结果对数值模型进行正确性验证,进一步分析了管径变化、深埋对土体承载力系数取值的影响,研究分析发现:深径比一定时,随着管径的增加,横向承载力系数减小;横向承载力系数与深径比的关系呈指数型曲线变化规律,并从土拱效应的角度解释了呈现该规律的原因.最后,针对砂土地基,建议了一个以深径比、管径、土体内摩擦角为自变量的土体承载力系数计算公式.
[Abstract]:In order to solve the problem of the deficiency of the pipe-soil interaction coefficient in the code at home and abroad, based on the Trautmann pipe-sand interaction test. The corresponding numerical simulation is carried out with ABAQUS software. Firstly, the correctness of the numerical model is verified by the model test results, and the pipe diameter change is further analyzed. The influence of deep burying on the bearing capacity coefficient of soil is studied and analyzed. It is found that the transverse bearing capacity coefficient decreases with the increase of pipe diameter when the ratio of depth to diameter is constant; The relationship between the lateral bearing capacity coefficient and the ratio of depth to diameter shows the law of exponential curve, and explains the reason of the law from the point of view of soil arch effect. Finally, for the sandy soil foundation, a ratio of depth to diameter and pipe diameter are suggested. The calculation formula of bearing capacity coefficient of soil is the independent variable of internal friction angle of soil.
【作者单位】：北京工业大学城市与工程安全减灾教育部重点实验室;
【基金】：国家自然科学基金资助项目(51278017,51421005)
【分类号】：TU435
【正文快照】： 为分析管道在不良地质,如断层、地面沉陷、滑坡等作用下的响应,国内外许多研究者利用解析方法及数值模拟的方法做出了诸多努力.解析方法中,Newmark等[1]、Kennedy等[2]以及Wang等[3]在假定管道变形模式的前提下,考虑管道在单位长度上受到的横向力或轴向力,继而得到计算管道最

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