基于土工离心模型试验的支盘桩承载特性研究

发布时间：2018-06-26 11:08

本文选题：支盘桩 + 承载特性　；参考：《长安大学》2014年硕士论文

【摘要】：本文以山西河（河津）—运（运城）高速公路桥梁桩基承载特性项目为依托，采用室内离心模型试验研究了轴向荷载作用下支盘桩的承载特性。通过设计不同模型研究了支盘直径、位置、数量、间距以及支盘与软弱层间距等因素对支盘桩承载特性的影响，针对依托项目找出合理的支盘参数；此外，通过设计不同的工况研究了桩间距和支盘竖向间距，对单排支盘桩的承载特性影响，得出合理的桩间距。在此基础上，基于支盘桩轴向荷载传递机理进和基本计算理论，讨论了支盘桩破坏形式、破坏机理和支盘桩承载力的影响因素。最后，应用MIDAS/GTS有限元分析软件，研究了支盘位置、大小对支盘桩单桩轴向承载力的影响以及桩间距对单排桩承载力、沉降变形的影响，和离心模型试验结果进行对比，，针对依托项目总结出了单桩最佳支盘间距、最佳支盘位置以及最佳单排桩桩间距。这些成果丰富了支盘桩的理论依据。此外，讨论了支盘桩的承载力确定方法，对比分析各个方法的优缺点，为设计过程中选择最符合实际的方法，提供了一定的理论依据。
[Abstract]:Based on the project of bearing characteristics of bridge pile foundation of Shanxi River (Hejin) -Yuncheng expressway, the bearing characteristics of branch pile under axial load are studied by laboratory centrifuge model test. By designing different models, the influence of the diameter, position, quantity, spacing and the distance between the branches and the weak layer on the bearing characteristics of the pile is studied, and the reasonable parameters of the branch and disc are found for the supporting project. The influence of pile spacing and vertical spacing on the bearing characteristics of single row pile is studied by designing different working conditions, and the reasonable pile spacing is obtained. On this basis, based on the theory of axial load transfer mechanism and basic calculation theory, the failure form, failure mechanism and bearing capacity of branch and disc pile are discussed. Finally, by using Midas / GTS finite element analysis software, the effects of the position and size of branch and disc on the axial bearing capacity of single pile and the effect of pile spacing on bearing capacity and settlement of single row pile are studied and compared with the results of centrifugal model test. The optimum spacing of single pile, the best position of branch and disc and the best spacing of single row pile are summed up according to the project. These results enrich the theoretical basis of branch-disc pile. In addition, the bearing capacity determination method of the pile is discussed, and the advantages and disadvantages of each method are compared and analyzed, which provides a certain theoretical basis for selecting the most practical method in the design process.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.15

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