【作者】 冯忠居；

【导师】 谢永利；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2003， 博士

【摘要】 本文在对大直径钻埋预应力混凝土空心桩的施工工艺分析研究的基础上，通过室内模拟试验，分别模拟桩与桩侧、桩端介质不同注浆情况下的相互作用性状，分析了桩侧介质变化时不同深度处桩侧极限摩阻力的变化规律和桩端介质变化时桩端承载力的变化规律。通过数值仿真，对桩在竖向荷载作用下不同的桩长、桩径及桩周介质强度参数变化时桩的承载性状进行了分析，并对桩在水平向荷载及其组合荷载作用下桩的内力变化规律进行了分析，提出了大直径钻埋预应力混凝土空心桩的刚性与柔性界定标准。利用弹性理论，推导了大直径空心桩在偏心荷载作用下的内力计算公式和桩在竖向荷载作用下桩承载力计算公式；提出了较为完整的大直径钻埋预应力混凝土空心桩设计计算方法。研究成果将为大直径钻埋预应力砼空心桩在工程中的推广应用奠定坚实的理论基础。更多还原

【Abstract】 On the basis of construction technique of large diameter bored hollow pile of prestressing force concrete, through simulation test, this paper simulates the interaction of pile with side mediator and pile with end mediator respectively under different conditions of injected cement paste, analyses the changing regularity of ultimate skin friction in different depths and different mediators, and also studies the changing regularity of end resistance in different end mediators. By means of numerical emulation, it analyses the pile vertical bearing capacity under different lengths, diameters and strength parameters of mediators as well as the inner force under lateral and combined loads, giving the criterion of rigid pile and flexible pile. With elastic theory, the paper deduces the inner force calculating formula under eccentric load and the bearing capacity calculating formula under vertical load; establishes a complete design and calculating method of large diameter pile. This research findings will set a firm theoretical foundation for its widely application.更多还原