层状地基中考虑桩端应力泡形扩散的单桩沉降计算
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1.中国地质大学(武汉)工程学院;2.中国地质大学(武汉) 工程学院;3.浙江大学 滨海和城市岩土工程研究中心

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国家自然科学基金项目(面上项目,重点项目,重大项目)


A calculation method for the settlement of single pile considering stress bulb dispersion of pile end soil
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1.School of Engineering, China University of Geosciences (Wuhan);2.Zhejiang University Binhai and Urban Geotechnical Engineering Research Center

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    摘要:

    基于虚土桩模型,研究了桩端应力扩散效应对单桩沉降的影响。首先,结合虚土桩模型和Boussinesq解,提出了考虑桩端应力泡形扩散的应力泡形虚土桩模型来考虑桩端土对桩的支承作用。然后,利用荷载传递法,对桩周土采用双折线模型,推导得到了层状地基中考虑桩端应力泡性扩散的单桩沉降解析解。进一步,讨论了弹性极限位移、弹性抗剪切刚度系数、附加应力值等参数对单桩沉降的影响。最后,结合工程实测数据,将本文方法与规范法及现有理论解进行对比,验证了本文方法的合理性。应力泡形虚土桩模型的最大优势在于能够较严格地给出桩端应力扩散边界,因而具有更广泛的工程应用意义。

    Abstract:

    Based on the fictitious soil pile model, the effect of pile-end stress diffusion on the settlement of single pile is investigated theoretically. Firstly, combining with the fictitious soil pile model and Boussinesq solution, the stress-bubble fictitious soil pile model is proposed to simulate the support of pile end soil on pile body. Then, utilizing a double-fold line model for the pile surrounding soil, an analytical solution for the settlement of single pile embedded in layered soils is derived based on the load transfer method. Furthermore, the effects of parameters such as elastic limit displacement, elastic shear stiffness coefficient and additional stress value, on the settlement of single pile are discussed based on the present solution. Finally, the present method is validated by comparing with code method and existing solution. The most important advantage of the stress-bubble fictitious soil pile model is that, the stress diffusion boundary at pile end can be given more strictly, so it has wider engineering significance.

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历史
  • 收稿日期:2020-05-12
  • 最后修改日期:2020-08-27
  • 录用日期:2020-09-25
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