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降雨作用下基覆型边坡失稳特征及承载力试验研究

杨兵 周子鸿 陶龙 伏冠西 卓林波

杨兵, 周子鸿, 陶龙, 伏冠西, 卓林波. 降雨作用下基覆型边坡失稳特征及承载力试验研究[J]. 西南交通大学学报, 2022, 57(4): 910-918. doi: 10.3969/j.issn.0258-2724.20200355
引用本文: 杨兵, 周子鸿, 陶龙, 伏冠西, 卓林波. 降雨作用下基覆型边坡失稳特征及承载力试验研究[J]. 西南交通大学学报, 2022, 57(4): 910-918. doi: 10.3969/j.issn.0258-2724.20200355
YANG Bing, ZHOU Zihong, TAO Long, FU Guanxi, ZHUO Linbo. Experimental Study on Instability Characteristic and Bearing Capacity of Slope with Bedrock under Rainfall[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 910-918. doi: 10.3969/j.issn.0258-2724.20200355
Citation: YANG Bing, ZHOU Zihong, TAO Long, FU Guanxi, ZHUO Linbo. Experimental Study on Instability Characteristic and Bearing Capacity of Slope with Bedrock under Rainfall[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 910-918. doi: 10.3969/j.issn.0258-2724.20200355

降雨作用下基覆型边坡失稳特征及承载力试验研究

doi: 10.3969/j.issn.0258-2724.20200355
基金项目: 国家自然科学基金(51178402); 中央高校基本科研业务费专项资金(2682017QY02);四川省科技计划项目资助(2021YFS0323, 2020YFG0123)
详细信息
    作者简介:

    杨兵(1976—),男,副教授,研究方向为边坡稳定性分析,E-mail:yangb@home.swjtu.edu.cn

  • 中图分类号: TU43

Experimental Study on Instability Characteristic and Bearing Capacity of Slope with Bedrock under Rainfall

  • 摘要:

    为了研究降雨诱导基覆型边坡失稳特性,采用室内模型试验方法对基覆型边坡在暴雨作用下的失稳过程及机制进行了系统研究. 通过探讨降雨前后边坡内土体含水率和孔隙水压力在时间、空间上的变化特性,揭示降雨诱导的边坡失稳机制. 同时通过坡顶加载方法研究了雨后边坡承载力变化规律. 研究结果表明:随着降雨的发展,在坡脚处首先出现土体液化流动现象,随后出现土体局部脱落;随着降雨的持续进行,土体脱落破坏的范围逐渐增大,进而导致上方土体临空面加大,土体破坏后随即被雨水饱和软化而向下滑动,后方土体进一步被侵蚀,最终造成了一定深度和宽度的边坡破坏现象;边坡内土体含水率升高与孔隙水压力的增大是导致边坡失稳破坏的主要因素;降雨停止后,边坡可以承受的极限荷载先增大后减小,最后趋于稳定,而基覆型边坡在顶部静荷载作用下破坏模式呈现出整体和局部滑移模式.

     

  • 图 1  基覆型堆积体边坡模型示意

    Figure 1.  Schematic diagram of slope model with bedrock

    图 2  试验装置

    Figure 2.  Testing apparatus

    图 3  砂土表观黏聚力和内摩擦角随饱和度变化曲线

    Figure 3.  Variation of sand cohesion and sand internal with saturation

    图 4  土的粒径级配曲线

    Figure 4.  Gradation cumulative of soil particle size

    图 5  测量仪器布置示意(单位:cm)

    Figure 5.  Schematic diagram of sensor arrangement (unit:cm)

    图 6  边坡破坏发展过程

    Figure 6.  Slope failure development process

    图 7  工况6对应的边坡破坏发展过程

    Figure 7.  Slope failure development process for condition 6

    图 8  孔隙水压力与体积含水率随时间变化曲线

    Figure 8.  Variations of pore water pressure and water content with time

    图 9  边坡内体积含水率不同时间的空间分布

    Figure 9.  Spatial distribution of moisture content in slope at different time

    图 10  边坡内孔隙水压力不同时刻的空间分布

    Figure 10.  Spatial distribution of pore water pressure in slope at different times

    图 11  整体破坏模式典型实验图

    Figure 11.  Typical experiment diagram of the overall failure mode

    图 12  局部破坏模式典型实验图

    Figure 12.  Typical experiment diagram ofthe local failure mode

    图 13  破坏图

    Figure 13.  Failure diagram

    图 14  边坡顶部极限载荷随雨停后时间的变化

    Figure 14.  Variation of ultimate load with time after rain stop

    表  1  各物理量的相似关系

    Table  1.   Similarity law of each physical quantity

    物理量相似常数物理量相似常数
    HCHcCc=CγCH
    γCγϕ1
    gCg$ \mathrm{\nu } $1
    $ \beta $1Ir${C_{I{\rm{r}}}} = C_H^{0.5}C_g^{0.5} $
    $ \alpha $1k${C_k} = C_H^{0.5}C_g^{0.5} $
    zCHt${C_t} = C_H^{0.5}C_g^{-0.5} $
    θ11q${C_q} = {C_\gamma }{C_H} $
    θ21
    下载: 导出CSV

    表  2  不同质量含水率条件下的强度指标

    Table  2.   Strength index under different water moistures

    质量含水率/% 饱和度/% c/kPa $\phi $/ (°)
    0 0 0 35.89
    6 25.75 2.71 32.59
    12 51.50 6.09 31.15
    18 77.25 6.15 30.98
    23 100.00 1.16 29.88
    下载: 导出CSV

    表  3  边坡降雨试验设计

    Table  3.   Design of slope rain test

    工况
    编号
    降雨持续
    时间/h
    降雨强度/
    (mm•h–1
    降雨
    等级
    雨停后加
    载时间/h
    14.521.96暴雨0
    24.521.96暴雨5
    34.521.96暴雨10
    44.521.96暴雨20
    54.521.96暴雨40
    64.521.96暴雨无加载
    下载: 导出CSV

    表  4  不同含水率下边坡安全系数理论值

    Table  4.   Safety factor of slope under different water moistures

    质量含水率/% 饱和度/% 安全系数
    0 0 < 0.10
    6 25.75 1.80
    12 51.50 3.70
    18 77.25 4.20
    23 100.00 0.85
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-06-06
  • 修回日期:  2020-11-01
  • 刊出日期:  2020-11-24

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