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基于水文过程和应力应变耦合的陕北黄土滑坡复活机理分析

王康 畅俊斌 李晓科 朱文峰 卢啸 刘慧

王康,畅俊斌,李晓科,等. 基于水文过程和应力应变耦合的陕北黄土滑坡复活机理分析−以延安二科庄滑坡为例[J]. 中国地质灾害与防治学报,2023,34(6): 46-55 doi: 10.16031/j.cnki.issn.1003-8035.202303037
引用本文: 王康,畅俊斌,李晓科,等. 基于水文过程和应力应变耦合的陕北黄土滑坡复活机理分析−以延安二科庄滑坡为例[J]. 中国地质灾害与防治学报,2023,34(6): 46-55 doi: 10.16031/j.cnki.issn.1003-8035.202303037
WANG Kang,CHANG Junbin,LI Xiaoke,et al. Mechanistic analysis of loess landslide reactivation in northern Shaanxi based on coupled numerical modeling of hydrological processes and stress strain evolution: A case study of the Erkezhuanglandslide in Yan’an[J]. The Chinese Journal of Geological Hazard and Control,2023,34(6): 46-55 doi: 10.16031/j.cnki.issn.1003-8035.202303037
Citation: WANG Kang,CHANG Junbin,LI Xiaoke,et al. Mechanistic analysis of loess landslide reactivation in northern Shaanxi based on coupled numerical modeling of hydrological processes and stress strain evolution: A case study of the Erkezhuanglandslide in Yan’an[J]. The Chinese Journal of Geological Hazard and Control,2023,34(6): 46-55 doi: 10.16031/j.cnki.issn.1003-8035.202303037

基于水文过程和应力应变耦合的陕北黄土滑坡复活机理分析

doi: 10.16031/j.cnki.issn.1003-8035.202303037
基金项目: 陕西地矿集团有限公司科研专项资金项目(KY202116)
详细信息
    作者简介:

    王康:王 康(1987-),男,地下水科学与工程专业,本科,高级工程师,从事水工环地质调查及地质灾害防治工作。E-mail:276636972@qq.com

    通讯作者:

    畅俊斌(1968-),男,水工地质专业,本科,正高级工程师,从事水工环地质调查及地质灾害防治工作。E-mail:290544312@qq.com

  • 中图分类号: P642.22

Mechanistic analysis of loess landslide reactivation in northern Shaanxi based on coupled numerical modeling of hydrological processes and stress strain evolution: A case study of the Erkezhuanglandslide in Yan’an

  • 摘要: 二庄科滑坡是典型受雨季影响的滑坡,降雨会改变老滑坡的渗流场,削弱基质吸力和土体抗剪强度,导致内部产生张拉裂缝,引发整体滑动和局部大变形。现有的研究很少考虑二庄科滑坡的渗流场与应力场的相互作用。因此,文章基于实际工程地质灾害背景,在现场监测数据和地形物理参数的基础上,建立了几何计算模型,并进行了水力耦合数值模拟。通过研究滑坡内部饱和度和孔压的变化规律来探讨降雨入渗规律,从应力位移的角度探讨降雨强度对滑坡复活的影响规律。此外,为了验证方法的准确性和可行性,选取了滑坡实测点位并找到了数值模型对应位置,对位移、土压力和饱和度三个方面进行了对比分析,得出数值模型能较好地反映实际情况的结论。通过数值模拟耦合计算和降雨条件下老滑坡复活机制的研究,对实测数据进行解释并分析滑坡复活过程,为后续工程预警和减灾工作提供理论基础和技术指导。
  • 图  1  二庄科滑坡全貌[16]

    Figure  1.  Overview of the Erzhuangke landslide

    图  2  工程地质灾害监测点分布图[16]

    Figure  2.  Distribution map of engineering geological disaster monitoring points

    图  3  二庄科滑坡FLAC3D建模

    Figure  3.  FLAC3D modeling of the Erzhuangke landslide

    图  4  特大暴雨情况下,孔隙压力及饱和度变化情况

    Figure  4.  Variation of pore pressure and saturation under extreme heavy rainfall

    图  5  切应力分布图

    Figure  5.  Shear stress distribution map

    图  6  滑坡位移对比

    Figure  6.  Comparison of landslide displacements

    图  7  G6、G7监测点在降雨过程中的竖向位移及模拟结果

    Figure  7.  Vertical displacement and simulation results of monitoring points G6 and G7 during rainfall process

    图  8  G6、G7监测点在降雨过程中的水平位移及模拟结果

    Figure  8.  Horizontal displacement and simulation results of monitoring points G6 and G7 during rainfall process

    图  9  G7监测点在降雨过程中的竖向土压力及模拟结果

    Figure  9.  Vertical soil pressure and simulation results of monitoring point G7 during rainfall process

    图  10  G7监测点深度2 m处在降雨过程中的饱和度及模拟结果

    Figure  10.  Saturation and simulation results at a depth of 2 m for monitoring point G7 during rainfall process

    表  1  模型参数设置

    Table  1.   Table of model parameter settings

    土体类型 密度/(kg∙m−3 体积模量/Pa 孔隙率 饱和渗透系数/(m∙s−1 内摩擦角/(°) 黏聚力/Pa 剪切模量/Pa 初始孔隙压力/Pa
    Qh 1900 2×108 0.40 3.9×10−4 18 3×104 5×104 21977
    Qp 1900 2×108 0.40 3.9×10−4 18 3×104 5×104 21977
    Q2 2800 1×109 0.15 1×10−12 36 1.2×106 3×108 0
    下载: 导出CSV

    表  2  G6点竖向位移实际模拟数据对比

    Table  2.   Comparison of actual and simulated vertical displacements for monitoring point G6

    日期 2021-10-28 2021-10-29 2021-10-30 2021-10-31
    实际数据/mm 239.01 241.03 242.00 243.04
    模拟数据/mm 202.98 209.76 214.31 219.05
    误差/% 15.07 12.97 11.44 9.87
    下载: 导出CSV

    表  3  G7点竖向位移实际模拟数据对比

    Table  3.   Comparison of actual and simulated vertical displacements for monitoring point G7

    日期 2021-10-10 2021-10-11 2021-10-12 2021-10-13
    实际数据/mm −2.014 −2.991 −4.028 −4.028
    模拟数据/mm 1.63 2.37 2.61 2.78
    误差/% 180.93 179.24 164.80 169.02
    下载: 导出CSV

    表  4  G6点水平位移实际模拟数据对比

    Table  4.   Comparison of actual and simulated horizontal displacements for monitoring point G6

    日期 2021-10-15 2021-10-16 2021-10-17 2021-10-18
    实际数据/mm 109.50 111.35 113.32 117.00
    模拟数据/mm 102.85 106.15 107.12 107.97
    误差/% 6.07 4.67 5.47 7.72
    下载: 导出CSV

    表  5  G7点水平位移实际模拟数据对比

    Table  5.   Comparison of actual and simulated horizontal displacements for monitoring point G7

    日期 2021-10-12 2021-10-13 2021-10-14 2021-10-15
    实际数据/mm 9.249 14.798 20.348 24.093
    模拟数据/mm 4.09 4.17 4.40 5.67
    误差/% 55.7 71.82 78.38 76.47
    下载: 导出CSV
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  • 收稿日期:  2023-03-16
  • 录用日期:  2023-08-23
  • 修回日期:  2023-07-14
  • 网络出版日期:  2023-08-30

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