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基于PFC3D的鱼鳅坡滑坡运动过程分析

张家勇 邹银先 杨大山

张家勇, 邹银先, 杨大山. 基于PFC3D的鱼鳅坡滑坡运动过程分析[J]. 中国地质灾害与防治学报, 2021, 32(4): 33-39. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-05
引用本文: 张家勇, 邹银先, 杨大山. 基于PFC3D的鱼鳅坡滑坡运动过程分析[J]. 中国地质灾害与防治学报, 2021, 32(4): 33-39. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-05
Jiayong ZHANG, Yinxian ZOU, Dashan YANG. Analysis of Yuqiupo landslide motion process based on PFC3D[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 33-39. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-05
Citation: Jiayong ZHANG, Yinxian ZOU, Dashan YANG. Analysis of Yuqiupo landslide motion process based on PFC3D[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 33-39. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-05

基于PFC3D的鱼鳅坡滑坡运动过程分析

doi: 10.16031/j.cnki.issn.1003-8035.2021.04-05
基金项目: 贵州省提升地质灾害监测预警科技能力行动方案项目(GZMC-ZG201910003)
详细信息
    作者简介:

    张家勇(1981-),男,贵州开阳人,硕士,高级工程师,主研领域为地学大数据分析应用与可视化研究。E-mail:75766880@qq.com

  • 中图分类号: P642.22

Analysis of Yuqiupo landslide motion process based on PFC3D

  • 摘要: 以贵州省开阳县鱼鳅坡滑坡为研究对象,采用颗粒流离散元(PFC3D)对其破坏运动过程进行数值模拟。采用Ball-Wall建模方法建立滑坡模型,对滑坡不同关键部位颗粒进行位移、速度监测,阐明其破坏运动特征。结果表明,降雨为鱼鳅坡滑坡的直接诱发因素。该滑坡在破坏初始阶段以蠕滑变形为主,随着变形量的增加,滑坡体不断挤压坡脚,滑坡岩土体到达应力平衡极限,坡脚产生剪切破坏,并向上牵引发展,滑坡发生整体滑动,斜坡变形破坏模式为蠕滑-拉裂,按照力学条件为牵引式破坏。滑坡滑动最高时速12.4 m/s,最大滑移80 m,滑动阶段持续50 s。研究成果可为对该类滑坡影响范围预测,以及工程措施的制定具有一定的参考意义。
  • 图  1  滑坡发生前后影像图

    Figure  1.  Image before and after landslide

    图  2  鱼鳅坡滑坡平面图

    Figure  2.  Plan of Yuqiupo Landslide

    图  3  滑坡剖面图(I−I′)

    Figure  3.  Section of landslide (I−I′)

    图  4  滑坡数值计算模型

    Figure  4.  Numerical calculation model of landslide

    图  5  不同时步速度云图(单位:m)

    Figure  5.  Velocity cloud map of different steps (unit: m)

    图  6  速度时程曲线

    Figure  6.  Time-history curve of velocity

    图  7  位移时程曲线

    Figure  7.  Displacement time-history curve

    图  8  平均速度、位移时程曲线

    Figure  8.  Average velocity and displacement time-history curves

    表  1  滑坡岩土体颗粒细观参数

    Table  1.   Mesoscopic parameters of rock and soil particles in landslide

    细观参数碎石土
    颗粒密度/(kg·m−3)2000
    颗粒半径/m0.25~0.5
    法向接触刚度/MPa28
    切向接触刚度/MPa28
    摩擦系数0.3
    法向黏结刚度/(MPa·m−1)10
    切向黏结刚度/(MPa·m−1)10
    黏结抗拉强度/MPa0.1
    黏结抗剪强度/MPa0.75
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-27
  • 修回日期:  2020-07-22
  • 网络出版日期:  2021-10-11
  • 刊出日期:  2021-08-25

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