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降雨诱发的浅表堆积层滑坡成因机理与稳定性预测模型

刘佳意 陈春利 付昱凯 王晨兴 李同录 肖锐铧 刘艳辉

刘佳意,陈春利,付昱凯,等. 降雨诱发的浅表堆积层滑坡成因机理与稳定性预测模型[J]. 水文地质工程地质,2023,50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202306051
引用本文: 刘佳意,陈春利,付昱凯,等. 降雨诱发的浅表堆积层滑坡成因机理与稳定性预测模型[J]. 水文地质工程地质,2023,50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202306051
LIU Jiayi, CHEN Chunli, FU Yukai, et al. Mechanism of rainfall-induced shallow landslide and stability prediction model[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202306051
Citation: LIU Jiayi, CHEN Chunli, FU Yukai, et al. Mechanism of rainfall-induced shallow landslide and stability prediction model[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202306051

降雨诱发的浅表堆积层滑坡成因机理与稳定性预测模型

doi: 10.16030/j.cnki.issn.1000-3665.202306051
基金项目: 国家重点研发计划项目(2021YFE0111900), 国家自然科学基金项目(No. 42207213),陕西省自然科学基础研究计划项目(2022JM-167)。
详细信息
    作者简介:

    刘佳意(1999-),女,硕士生,主要从事工程地质与地质灾害研究。E-mail:652042569@qq.com

    通讯作者:

    陈春利(1987–),女,博士,高级工程师, 主要从事工程地质与地质灾害研究。E-mail: chen_chunli@126.com

  • 中图分类号: P642.22

Mechanism of rainfall-induced shallow landslide and stability prediction model

  • 摘要: 强降雨引起的滑坡多以浅表堆积层滑移为主,易群发、危害性大,其地下水和土体内部含水率对降雨的水文响应机制复杂,难以精准开展稳定性预测。为研究降雨引起的滑坡水文响应对滑坡稳定性的影响,以四川省青川县后山里滑坡为例,开展现场降雨入渗监测、相关性分析和力学分析。通过连续三年的降雨量、土体水分和地下水位等监测,分析了降雨入渗-土体体积含水率-地下水位的响应规律,建立了降雨量与地下水位的相关关系,并基于无限斜坡稳定性计算公式构建了基于降雨量和地下水位埋深的浅层滑坡稳定性预测模型。结果表明:(1)年内地下水呈周期性波动,分为缓慢下降期、快速下降期和快速上升期三个阶段,且降雨量与地下水埋深呈线性负相关,与水位升幅相关性不显著;(2)根据稳定性预测模型确定了该滑坡失稳的临界降雨阈值81.8 mm/d和地下水埋深阈值0.73 m。研究结果可为降雨诱发浅表堆积层滑坡的预警预报提供参考。
  • 图  1  四川青川后山里滑坡

    Figure  1.  Houshanli landslide in Qingchuan county, Sichuan province

    图  2  后山里滑坡监测现场布置

    Figure  2.  Monitoring site of the Houshanli landslide

    图  3  粒径级配曲线

    Figure  3.  Particle size distribution curve

    图  4  降雨-土体体积含水率-地下水位的对应关系

    Figure  4.  Corresponding relationship between rainfall, volumetric water content and water level

    图  5  降雨强度-地下水位深度的关系

    Figure  5.  Corresponding relationship between rainfall and groundwater level

    图  6  地下水位升幅随日降雨量的关系变化

    Figure  6.  Groundwater level rising vs. daily precipitation

    图  7  地下水埋深随日降雨量变化

    Figure  7.  Groundwater depth vs. daily precipitation

    图  8  无限边坡模型

    Figure  8.  Model of infinite slope

    图  9  2020-2022年降雨集中期降雨量与地下水位埋深及其阈值

    Figure  9.  Precipitation and water depth during raining period from 2020 to 2022 and their thresholds

    图  10  2020-2022年降雨集中期后山里滑坡滑移现象

    Figure  10.  Sliding of HouShanli landslide during raining period from 2020 to 2022

    表  1  7月—8月主要降雨事件中降雨量及其引起的地下水位变化参数

    Table  1.   Daily Precipitation and the related groundwater level variation in July and August

    日期 水位升幅
    当日降雨量/mm
    降雨前初始
    水位埋深/m
    降雨截止最高
    水位深度/m
    水位升幅/m
    2020/7/10* 29.9 2.59 2.55 0.04
    2020/7/24* 83.9 2.40 0.65 1.75
    2020/7/25* 16.3 1.32 0.97 0.35
    2020/7/29* 21.0 1.93 1.64 0.29
    2020/7/30 13.4 1.65 1.50 0.15
    2020/8/5* 69.6 1.94 0.92 1.02
    2020/8/6 21.8 1.41 1.20 0.21
    2020/8/11 134.2 1.92 0.51 1.41
    2020/8/12 103.7 1.24 0.62 0.62
    2020/8/14 14.4 1.46 1.36 0.10
    2020/8/15 80.6 1.49 0.81 0.68
    2020/8/16 127.3 0.87 0.62 0.25
    2020/8/17 111.2 0.90 0.54 0.36
    2020/8/22 20.4 1.36 1.25 0.11
    2020/8/23* 41.5 1.19 1.16 0.03
    2020/8/30 44.1 1.57 0.90 0.67
    2021/7/10* 52.6 2.68* 2.44 0.24
    2021/7/14 47.5 2.10 1.88 0.22
    2021/8/16* 21.6 2.93 2.91 0.02
    2021/8/17* 54.2 2.93 1.74 1.19
    2021/8/18* 124.1 1.68 0.85 0.83
    2021/8/19* 12.7 1.31 1.08 0.23
    2021/8/21* 15.2 1.65 1.54 0.11
    2021/8/22 14.6 1.41 1.30 0.11
    2022/7/12* 62.4 2.62 2.45 0.17
    2022/7/13* 54.9 2.42 1.13 1.29
    2022/7/14* 50.4 1.51 0.63 0.88
    2022/7/16 17.2 1.70 1.28 0.42
    2022/7/22* 22.1 2.00 1.81 0.19
    2022/7/27* 19.6 2.12 2.04 0.08
    2022/8/4* 31.1 2.17 1.91 0.26
    2022/8/25* 89.4 2.52 1.51 1.01
    2022/8/26 11.7 1.62 1.50 0.12
    2022/8/27 25.6 1.61 1.19 0.42
    2022/8/28* 50.6 1.44 0.59 0.85
    *.剔除降雨强度<10 mm/h和地下水位埋深>2 m的数据
    下载: 导出CSV
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  • 收稿日期:  2023-06-28
  • 录用日期:  2023-10-13
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