【作者】 雷劲松；

【导师】 侯克鹏； 段尔焕；

【作者基本信息】 昆明理工大学 ， 结构工程， 2002， 硕士

【摘要】 根据作者所做的大直径桩试验及收集来的大量大直径桩静载荷试桩资料，本文系统研究了大直径桩侧阻力与端阻力的性状，及侧阻力、端阻力与沉降的关系。 首先介绍了桩基检测的方法并分析了单桩荷载—桩顶沉降、桩端沉降、桩身压缩曲线的特性及其在工程中的应用。通过分析桩端沉降与桩顶沉降的理论关系，推导了一个预估单桩在工作荷载下沉降的简化计算公式。 基于大量的桩基静载荷试桩资料，本文分析了嵌岩桩及以砾石，粉土，粘土为持力层的大直径桩的荷载传递性状及侧阻与端阻的比例关系。与此同时，阐述了利用桩端沉降来划分桩侧摩阻力和桩端阻力的方法，以及利用桩顶、桩端沉降差值来判断桩身质量的方法。 利用有限元软件(3D—σ)对影响单桩桩顶沉降、桩端沉降以及桩的荷载传递特性的各种因素进行了研究。对大直径桩的桩径，桩长、桩侧土与桩端持力层性状、入持力层深度，单桩竖向极限承载力，极限荷载下的桩顶沉降、桩端沉降和桩身(弹性、塑性)压缩量，桩侧摩阻力值及对应的桩顶与桩端沉降，桩侧摩阻力与桩端阻力分担比等参数作了分析，结果可用于指导工程实践和理论研究。 根据有关规范，利用VC++编制了桩基检测数据分析软件，能对桩基、复合地基、孔底静载试验数据处理分析，可以用于工程实践。更多还原

【Abstract】 This paper bases on the test data of a great volume of large-diameter pile, The behavior of the shaft resistance and base resistance and settlement of large-diameter pile is analyzed .The method of testing the base settlement of pile bottom i’s introduced in this paper, How to use the characteristic of P-St, Sb, Ss, curve in engineering practice is then discussed. A simple formula to calculate the settlement of pile under the service load is conducted by the theoretical correlation between pile top settlement and pile base settlement.Bases on the mass field test data of large-diameter pile, The characteristics of the load transfer and the proportion of side resistance and end resistance of piles socketed in gravel, silt clay on soft soil foundation. At the same time, this paper put forward a new method of using the end settlement to part the side resistance and the end resistance of piles and using the difference between the top settlement and the end settlement to determine the mass of piles.An elastic-plastic finite elements procedure(3D- a) is set up to analyze the factor influencing the pile top settlement, base settlement, compression of pile shaft and the load transfer of pile, the parameters of large-diameter piles, such as the pile length and diameter, the property of superstratum soils and the rock in the pile base, the thickness of sludge beneath the pile bottom and around the pile shaft, the length of rock socketed are analyzed, the ultimate capacity, the pile top settlement and pile base settlement, the relationship between the shaft resistance and base resistance, the elastic compression and plastic compression of pile concrete under the ultimate load are then discussed, The result can be used in the design and theory research.According to the relevant technical codes and specifications, a procedure to analyze the test data of piles is designed in VC++ language, it can analyze the field test data of kinds of piles and foundations, the procedure already be used in engineering construction and the result is correct.更多还原