砂土地基中V-H-M组合荷载下单桩分析方法研究

发布时间：2018-01-07 06:13

本文关键词：砂土地基中V-H-M组合荷载下单桩分析方法研究　出处：《岩土工程学报》2017年S2期 　论文类型：期刊论文

【摘要】：海上风力发电机的大直径桩通常会受到多向荷载共同作用。在实践设计中,基础的竖向和水平承载性能是独立分开设计的,但大量研究证明竖向荷载对桩基水平承载性能具有重要的影响。将竖向荷载对大直径单桩水平承载性能的影响划分为3部分:(1)竖向荷载对桩周p y曲线影响;(2)P (35)效应;(3)桩侧摩阻力引起的反向弯矩。然后,以楔形体模型为基础考虑竖向荷载对桩侧土抗力极限值pu的影响推导了修正p y曲线计算公式,在传统水平受荷桩的弹性地基梁方程中引入P (35)效应和桩侧摩阻力引起反向弯矩,建立了均质砂土中承受水平力、竖向力及弯矩三向组合荷载下的单桩的分析方法。并将该方法应用于既有案例,验证了该理论方法的可行性。
[Abstract]:The large diameter piles of offshore wind turbines are usually subjected to multi-direction loads. In practical design, the vertical and horizontal bearing capacity of the foundation are designed separately. However, a large number of studies have proved that the vertical load has an important influence on the horizontal bearing capacity of pile foundation. The influence of vertical load on the horizontal bearing capacity of large diameter single pile is divided into 3 parts: 1). The influence of vertical load on the p y curve of pile circumference; (2) the effect of 2 ~ (2) P ~ (+) ~ (35); Then, considering the influence of vertical load on the limit value of soil resistance of pile side, the calculation formula of modified p-y curve is derived based on the anti-bending moment caused by friction resistance of pile side. In the traditional beam equation of elastic foundation of horizontally loaded piles, the effect of P ~ (35) and the reverse bending moment caused by frictional resistance on the side of the pile are introduced, and the horizontal force in homogeneous sand is established. The analysis method of single pile under three direction combined load of vertical force and bending moment is applied to existing cases to verify the feasibility of the theoretical method.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家自然科学基金项目(41572260,51208378) 国家重点基础研究发展规划项目(973项目)(2013CB036304)
【分类号】：TU473.1
【正文快照】： 海上风机桩基础通常会承受多向荷载共同作用,包括竖向荷载、水平荷载及弯矩等。大直径单桩基础结构简单,生产费用低,在海上风机中得到广泛应用。海上风机大直径单桩现有的设计方法未考虑多向荷载组合的不利影响,设计理论远远落后于工程实践要求,所以有必要对多向荷载下桩基分

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