推扭(H-T)荷载作用下刚性矩形基础承载特性研究

尹平保, 伍晗曦, 贺炜, 谭李俊英, 刘江波, 方敏. 推扭(H-T)荷载作用下刚性矩形基础承载特性研究[J]. 水文地质工程地质, 2024, 51(4): 125-134. doi: 10.16030/j.cnki.issn.1000-3665.202307036
引用本文: 尹平保, 伍晗曦, 贺炜, 谭李俊英, 刘江波, 方敏. 推扭(H-T)荷载作用下刚性矩形基础承载特性研究[J]. 水文地质工程地质, 2024, 51(4): 125-134. doi: 10.16030/j.cnki.issn.1000-3665.202307036
YIN Pingbao, WU Hanxi, HE Wei, TAN Lijunying, LIU Jiangbo, FANG Min. Study on bearing characteristics of rigid rectangular foundation subjected to horizontal force and torque (H-T)[J]. Hydrogeology & Engineering Geology, 2024, 51(4): 125-134. doi: 10.16030/j.cnki.issn.1000-3665.202307036
Citation: YIN Pingbao, WU Hanxi, HE Wei, TAN Lijunying, LIU Jiangbo, FANG Min. Study on bearing characteristics of rigid rectangular foundation subjected to horizontal force and torque (H-T)[J]. Hydrogeology & Engineering Geology, 2024, 51(4): 125-134. doi: 10.16030/j.cnki.issn.1000-3665.202307036

推扭(H-T)荷载作用下刚性矩形基础承载特性研究

  • 基金项目: 国家自然科学基金项目(52178311;52078055);湖南省教育厅科学研究项目(20A001);江西省交通运输厅科技项目(2021H0005)
详细信息
    作者简介: 尹平保(1984—),男,博士,副教授,主要从事桩基础及支挡结构工程等方面的研究。E-mail:pingbaby921@163.com
  • 中图分类号: TU471.1

Study on bearing characteristics of rigid rectangular foundation subjected to horizontal force and torque (H-T)

  • 现行杆件基础设计仅考虑水平力(H)而忽略扭矩(T)的作用,这很可能导致杆件基础发生推扭破坏。为分析推扭(H-T)荷载下刚性矩形基础的承载特性,首先根据杆件基础的受力特点,建立了相应的简化计算模型,推导了TH-偏心弯矩(M) 2种承载模式下基础受力与变形分析的理论解答;其次通过数值模拟分析,获得了H-T荷载下矩形刚性基础的破坏包络线;在此基础上,通过室内模型试验验证了理论计算方法的合理性,并探讨了扭推比、地基抗力比例系数m值对基础受力与变形的影响。研究发现:H-T荷载下刚性矩形基础的破坏包络线近似呈抛物线分布;随扭推比增大,矩形基础的地基承载力随之减小,其破坏模式也由水平变形破坏转为扭转变形破坏;增大m值,可有效减小基础地面处水平位移及旋转角度。为确保刚性矩形基础的安全稳定,其上覆回填土体性质和压实度均应满足设计要求。上述结论可为多杆合一杆件基础的设计提供参考。

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  • 图 1  多杆合一杆件基础简化受力模型

    Figure 1. 

    图 2  基础受力与变形平面图

    Figure 2. 

    图 3  模式一下基础受力与变形示意图

    Figure 3. 

    图 4  模式二下基础受力与变形示意图

    Figure 4. 

    图 5  H-T下刚性矩形基础的破坏包络线

    Figure 5. 

    图 6  试验用土的级配曲线

    Figure 6. 

    图 7  模型试验布置图(尺寸单位:cm)

    Figure 7. 

    图 8  m值随杆件地面处位移关系曲线

    Figure 8. 

    图 9  理论与试验结果对比分析

    Figure 9. 

    图 10  不同扭推比下基础旋转角度与破坏包络线

    Figure 10. 

    图 11  不同m值下基础变形图

    Figure 11. 

    表 1  试验土体物理力学性质指标

    Table 1.  Physical and mechanical indexes of test soil

    参数 φ/(°) c/kPa w/% ρdmax/(g·cm−3 Es/MPa Ip
    取值 24.39 26 19.72 1.75 6.93 27.2
      注:φ为内摩擦角;c为黏聚力;w为含水率,ρdmax为最大干密度;Es为压缩模量;Ip为土体塑性指数。
    下载: 导出CSV

    表 2  试验加载方案

    Table 2.  Test loading scheme

    荷载等级 H1/kN H2/kN H/kN T/(kN·m)
    1 0.20 0.13 0.07 0.068
    2 0.40 0.26 0.14 0.136
    3 0.60 0.39 0.21 0.204
    $\vdots $ $\vdots $ $\vdots $ $\vdots $ $\vdots $
    n 0.20n 0.13n 0.07n 0.068n
    下载: 导出CSV
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出版历程
收稿日期:  2023-07-19
修回日期:  2023-12-13
刊出日期:  2024-07-15

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