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不同变位模式黏土非极限被动土压力试验研究

夏军武 窦国涛 苏琼 白维刚 袁方

夏军武, 窦国涛, 苏琼, 白维刚, 袁方. 不同变位模式黏土非极限被动土压力试验研究[J]. 西南交通大学学报, 2019, 54(4): 769-777. doi: 10.3969/j.issn.0258-2724.20170343
引用本文: 夏军武, 窦国涛, 苏琼, 白维刚, 袁方. 不同变位模式黏土非极限被动土压力试验研究[J]. 西南交通大学学报, 2019, 54(4): 769-777. doi: 10.3969/j.issn.0258-2724.20170343
XIA Junwu, DOU Guotao, SU Qiong, BAI Weigang, YUAN Fang. Experiment Study on Non-limit Passive Earth Pressure of Clay under Different Displacement Modes[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 769-777. doi: 10.3969/j.issn.0258-2724.20170343
Citation: XIA Junwu, DOU Guotao, SU Qiong, BAI Weigang, YUAN Fang. Experiment Study on Non-limit Passive Earth Pressure of Clay under Different Displacement Modes[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 769-777. doi: 10.3969/j.issn.0258-2724.20170343

不同变位模式黏土非极限被动土压力试验研究

doi: 10.3969/j.issn.0258-2724.20170343
基金项目: 国家自然科学基金资助项目(51274192);河南省科技攻关项目(182102310721);江苏省土木工程环境灾变与结构可靠性重点实验室开放基金项目(JSKY2018YB04)
详细信息
    作者简介:

    夏军武(1967—),女,教授,研究方向为采动区地表变形与建(构)筑物协同作用、采动区建(构)筑物保护及特种结构,E-mail:Xiajunwu100@163.com

  • 中图分类号: TU411

Experiment Study on Non-limit Passive Earth Pressure of Clay under Different Displacement Modes

  • 摘要: 为了揭示墙体平动和转动模式下黏土非极限被动土压力分布规律,采用自制模型箱,进行了墙体平动和转动模式下黏土非极限土压力试验,研究了墙体变位模式以及墙体位移大小对侧土压力的影响规律细化方法,首先进行了室内试验,得到了黏土的基本物理参数,其次进行了模型箱和测试仪器的固定安装,最后进行了挡土墙平移模式(T模式)、绕墙顶转动模式(RT模式)以及绕墙底转动模式(RB模式)3种模式下的土压力试验. 试验结果表明:T模式下,非极限侧土压力沿墙体深度的增加总体趋势增大,局部会有减小趋势,总体接近线性分布,当土体达到极限破坏时,靠近加载墙体处土体表面形成阶梯状错层;RT模式下,侧土压力随墙体的深度总体接近凹曲线分布,上部侧土压力随深度增加较慢,下部侧土压力随深度增加较快,当土体达到极限破坏时,靠近加载墙体处土体表面产生裂纹,模型箱中部土体表面鼓起;RB模式下,侧土压力随墙体的深度的增加先增大后减小,总体接近凸曲线分布,当土体达到极限破坏时,靠近加载墙体处土体表面形成阶梯状错层,其阶梯状错层范围要小于平动模式工况;三者非极限侧土压力合力随着压缩位移的增大而增大,当压缩位移相同时,RT模式下土压力合力与T模式下土压力合力比值在0.53~0.97之间,RB模式下土压力合力与T模式下土压力合力比值在0.65~0.83之间. 结论中是否有可以量化的数据,参考附件模板修改.

     

  • 图 1  模型箱试验装置详图(单位:m)

    Figure 1.  Details of the model box test device (unit:m)

    图 2  加载模式

    Figure 2.  Schematic diagram of loading mode

    图 3  非极限土压力随深度分布(T模式)

    Figure 3.  Non-limit earth pressure with depth distribution (T-mode)

    图 4  非极限土压力随压缩位移分布(T模式)

    Figure 4.  Non-limit earth pressure with compression displacement (T-mode)

    图 5  非极限土压力随深度分布(RT模式)

    Figure 5.  Non-limit earth pressure with depth distribution (RT-mode)

    图 6  非极限土压力随压缩位移分布(RT模式)

    Figure 6.  Non-limit earth pressure with compression displacement (RT-mode)

    图 7  非极限土压力随深度分布(RB模式)

    Figure 7.  Non-limit earth pressure with depth distribution (RB-mode)

    图 8  非极限土压力随压缩位移分布(RB模式)

    Figure 8.  Non-limit earth pressure with compression displacement (RB-mode)

    图 9  3种变位模式下非极限土压力对比

    Figure 9.  Contrast diagram of non-limit earth pressure in three types of translocation modes

    图 10  3种变位模式下非极限土压力三维曲面图

    Figure 10.  3D surface diagram of non-limit earth pressure in three types of translocation modes

    图 11  非极限土压力合力随压缩位移变化

    Figure 11.  Variation of the non-limit soil pressure resultant force with compression displacement

    图 12  黏土非极限土压力合力作用点

    Figure 12.  The action point of the non-limit soil pressure resultant force of clay

    图 13  黏土破坏形态

    Figure 13.  Failure modes of clay

    表  1  土体物理参数

    Table  1.   Physical parameters of soil

    参数数值
    φ/(°)34
    c/kPa5
    γ/(kN•m–3)15.73
    w/%7.97
    ${\rho _{{\rm{d}}\max }}$/(kg•m–3)1 920
    wp/%22.7
    下载: 导出CSV

    表  2  非极限侧土压力合力比值

    Table  2.   Ratio of non-limit soil pressure resultant force

    压缩位移/mPRT/PTPRB/PT
    0.010.830.75
    0.020.970.83
    0.030.800.73
    0.040.820.69
    0.050.720.68
    0.060.640.66
    0.070.600.66
    0.080.530.65
    0.090.540.68
    下载: 导出CSV
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  • 收稿日期:  2017-05-24
  • 修回日期:  2018-08-10
  • 网络出版日期:  2018-09-05
  • 刊出日期:  2019-08-01

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