楔形桩极限承载力提高机理研究

发布时间：2018-05-31 16:16

本文选题：楔形桩 + 极限承载力　；参考：《哈尔滨工业大学学报》2017年12期

【摘要】：为研究楔形桩相对等截面桩极限承载力提高机理及楔形桩承载力特性,根据楔形桩承载机理,将楔形桩承载过程分为弹性变形及挤土塑性破坏两个阶段.假定桩侧土体发生破坏时应力状态服从Mohr-Coulomb强度准则,建立了楔形桩承载力分析模型并提出了楔形桩极限承载力增大系数.通过与已有模型试验分析对比验证了本文解答的合理性.在此基础上,分析了承载力增大系数随桩-土界面摩擦系数、楔形角、静止土压力系数等的变化规律.结果表明:本文理论方法能够较为合理地预测楔形桩的极限承载力;楔形桩承载力增大系数随着土体内摩擦角增大而增大,但随着静止土压力系数和桩-土界面摩擦系数增大而减小,同时存在特定的楔形角使得承载力增大系数最大.
[Abstract]:In order to study the increasing mechanism of ultimate bearing capacity of wedge pile relative to equal section pile and the bearing capacity characteristics of wedge pile, according to the bearing mechanism of wedge pile, the bearing process of wedge pile is divided into two stages: elastic deformation and plastic failure of squeezing soil. On the assumption that the stress state of pile side soil is based on Mohr-Coulomb strength criterion, the bearing capacity analysis model of wedge pile is established and the increasing coefficient of ultimate bearing capacity of wedge pile is put forward. The rationality of the solution is verified by comparison with the existing model test. On this basis, the variation law of bearing capacity increasing coefficient with the friction coefficient of pile-soil interface, wedge angle, static earth pressure coefficient and so on is analyzed. The results show that the theoretical method in this paper can reasonably predict the ultimate bearing capacity of the wedge pile, and the coefficient of increase of the bearing capacity of the wedge pile increases with the increase of the internal friction angle of the soil. However, with the increase of the static earth pressure coefficient and the pile-soil interface friction coefficient, the bearing capacity increase coefficient is maximum with the existence of a specific wedge angle.
【作者单位】：岩土及地下工程教育部重点实验室(同济大学);同济大学地下建筑与工程系;
【基金】：国家自然科学基金(41272288)
【分类号】：TU473.11

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