干湿循环及水平循环荷载下的码头群桩侧向累积位移
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TU473

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国家自然科学基金(51979017);重庆市教委科技攻关计划青年项目(KJQN-201900709); 重庆交通大学研究启动资金(KJQN-201900709); 中国博士后科学基金(2020M683228);重庆交通大学研究生科研创新项目(2020S0027)


Lateral Cumulative Displacement of Wharf Pile Group under Wetting-Drying Cycles and Horizontal Cyclic Loading
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    摘要:

    为了揭示干湿循环及水平循环荷载作用下码头群桩累积侧向位移分布特征,本文基于水平循环受荷的刚度衰减模型和土体抗剪强度干湿循环弱化模型,通过ABAQUS进行二次开发实现了土体刚度衰减和土体抗剪强度干湿循环弱化,并依托三峡库区某在役货运码头,建立了码头群桩-岸坡相互作用三维数值模型。通过数值结果系统分析了三峡库区在干湿循环及水平循环荷载作用下码头群桩桩顶及桩身累积侧向位移。研究表明:干湿循环和水平循环荷载产生的循环效应集中在循环周期的前面阶段;存在临界水平循环荷载比,当水平循环荷载比小于临界值时,累积位移随着循环次数的增加而逐渐增大,在加载后期桩基侧向位移趋于稳定;当当水平循环荷载比大于临界值时,累积位移随循环次数的增加而不断增大,在加载后期仍有不断增加的趋势,当桩基设计从控制变形考虑时,建议将水平循环荷载比控制在0.5以内;干湿循环后在水平循环荷载作用下,桩侧累积位移有明显增大的趋势;最后,根据数值计算结果,提出了干湿循环后水平循环荷载作用下群桩桩顶侧向累积位移预测模型,可供工程实践参考。

    Abstract:

    In order to reveal the distribution of cumulative lateral displacement of pile group of wharf under wetting-drying cycles and horizontal cyclic loading, this paper numerically investigated the development law of cumulative lateral displacement of pile group under wetting-drying cycles and horizontal cyclic loading using a 3D finite element model for wharf-bank slope interaction base on a freight terminal in service in the Three Gorges Reservoir area of China. Firstly, the wetting-drying cyclic degradation model of soil shear strength is used to simulate the degradation of soil shear strength during wetting-drying cycles. The improved stiffness degradation model of soil is employed to simulate the stiffness degradation of soil under horizontal cyclic loading. Meanwhile, the finite element software ABAQUS is used for secondary development to achieve the stiffness degradation model and wetting-drying cyclic degradation model of shear strength. Then, the cumulative lateral displacement of pile is systematically examined in detail under wetting-drying cycles. Horizontal cyclic loading and the horizontal cyclic loading after wetting-drying cycles. Finally, a prediction method of lateral displacement of pile top under the horizontal cyclic loading after wetting-drying cycles is proposed based on the numerical results, which may provide some references for engineering practice.

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邢磊,王多银,段伦良,等. 干湿循环及水平循环荷载下的码头群桩侧向累积位移[J]. 科学技术与工程, 2021, 21(19): 8166-8175.
Xing Lei, Wang Duoyin, Duan Lunliang, et al. Lateral Cumulative Displacement of Wharf Pile Group under Wetting-Drying Cycles and Horizontal Cyclic Loading[J]. Science Technology and Engineering,2021,21(19):8166-8175.

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  • 收稿日期:2020-12-02
  • 最后修改日期:2021-04-17
  • 录用日期:2021-03-18
  • 在线发布日期: 2021-07-22
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