浅埋圆形基础竖向地基承载力极限分析上限解

发布时间：2018-11-03 20:44

【摘要】：圆形基础是一种应用广泛的基础形式,而目前基础承载力研究主要集中在条形基础上,对圆形基础研究较少.针对现有圆形基础承载力求解方法中存在的问题,构建了多块体离散破坏模式,同时考虑土体自重、黏聚力及边载因素,求得竖向极限承载力的上限解表达式,并编制了最优化计算程序.将计算结果与已有的滑移线解、上限解、Hansen解以及工程实测资料进行广泛比较,证明该处计算浅埋圆形基础承载力的方法是更加准确合理的.然后根据计算结果分析了圆形基础地基滑裂面特性,发现由于同时考虑了土体重度,计算得到的地基滑裂面范围小于经典的对数螺旋滑裂面,滑裂面范围随内摩擦角的增大而增大,随重度增加而减小,随基础埋深的增大而增大.
[Abstract]:Circular foundation is a widely used foundation form, but the research on bearing capacity of foundation is mainly focused on strip foundation, but the research on circular foundation is less. Aiming at the problems existing in the existing methods of calculating the bearing capacity of circular foundation, the discrete failure mode of multi-block is constructed, and the upper limit solution of vertical ultimate bearing capacity is obtained by taking into account the factors of soil mass, cohesion and side load. The optimization calculation program is also worked out. The calculated results are compared with the existing slip line solutions, upper bound solutions, Hansen solutions and engineering measured data. It is proved that the method for calculating the bearing capacity of shallow circular foundation is more accurate and reasonable. Then, according to the calculation results, the characteristics of the slip surface of circular foundation are analyzed. It is found that the calculated range of the sliding surface is smaller than that of the classical logarithmic spiral surface because the soil mass is taken into account at the same time. The range of the slip surface increases with the increase of the angle of internal friction, decreases with the increase of the gravity, and increases with the increase of the depth of the foundation.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家高技术研究发展计划(863计划)资助项目(2012AA051702) 国家国际科技合作专项资助项目(2012DFA70490) 天津市应用基础及前沿技术研究计划资助项目(青年基金项目)(12JCQNJC04000)
【分类号】：TU470

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