管-砂土横向相互作用中土体极限承载力

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。

Ultimate Soil Bearing Capacity of Lateral Pipeline-sand Interaction

In order to make up for the inadequacy of ascertaining the lateral bearing capacity coefficient of pipeline-soil interaction in the domestic and international standard, some numerical models were built to simulate the pipeline-sand interaction by using ABAQUS software package. First, these numerical models were verified with the Trautmann lateral pipe-sand interaction test results. Then, the effects of pipe diameter and embedded depth on the bearing capacity coefficient were analyzed, and some conclusions were gained as follows:the lateral bearing capacity coefficient decreases with the increase of diameter when the depth diameter ratio is constant; the relationship between the lateral bearing capacity coefficient and the ratio of depth to diameter submit to exponential curve, which was explained from the point of view of soil arch effect. Finally, a formula for calculating the bearing capacity coefficient for sand foundation was proposed, considering the effect of internal friction angle, the ratio of buried depth to diameter and pipe diameter.