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基于离散元的高速远程滑坡运动堆积特征及能量转化研究——以三溪村滑坡为例

胡晓波 樊晓一 唐俊杰

胡晓波, 樊晓一, 唐俊杰, 2019. 基于离散元的高速远程滑坡运动堆积特征及能量转化研究——以三溪村滑坡为例. 地质力学学报, 25 (4): 527-535. DOI: 10.12090/j.issn.1006-6616.2019.25.04.051
引用本文: 胡晓波, 樊晓一, 唐俊杰, 2019. 基于离散元的高速远程滑坡运动堆积特征及能量转化研究——以三溪村滑坡为例. 地质力学学报, 25 (4): 527-535. DOI: 10.12090/j.issn.1006-6616.2019.25.04.051
HU Xiaobo, FAN Xiaoyi, TANG Junjie, 2019. ACCUMULATION CHARACTERISTICS AND ENERGY CONVERSION OF HIGH-SPEED AND LONG-DISTANCE LANDSLIDE ON THE BASIS OF DEM: A CASE STUDY OF SANXICUN LANDSLIDE. Journal of Geomechanics, 25 (4): 527-535. DOI: 10.12090/j.issn.1006-6616.2019.25.04.051
Citation: HU Xiaobo, FAN Xiaoyi, TANG Junjie, 2019. ACCUMULATION CHARACTERISTICS AND ENERGY CONVERSION OF HIGH-SPEED AND LONG-DISTANCE LANDSLIDE ON THE BASIS OF DEM: A CASE STUDY OF SANXICUN LANDSLIDE. Journal of Geomechanics, 25 (4): 527-535. DOI: 10.12090/j.issn.1006-6616.2019.25.04.051

基于离散元的高速远程滑坡运动堆积特征及能量转化研究——以三溪村滑坡为例

doi: 10.12090/j.issn.1006-6616.2019.25.04.051
基金项目: 

国家自然科学基金项目 41877524

工程材料与结构冲击振动四川省重点实验室开放基金项目 18kfjk10

西南科技大学研究生创新基金资助 19ycx0081

详细信息
    作者简介:

    胡晓波(1993-), 男, 在读硕士, 研究方向为地质灾害。E-mail:dzhxb@qq.com

    通讯作者:

    樊晓一(1974-), 男, 教授, 主要从事岩土工程及地质灾害方面的教学与研究工作。E-mail:xyfan1003@126.com

  • 中图分类号: P642.22

ACCUMULATION CHARACTERISTICS AND ENERGY CONVERSION OF HIGH-SPEED AND LONG-DISTANCE LANDSLIDE ON THE BASIS OF DEM: A CASE STUDY OF SANXICUN LANDSLIDE

  • 摘要: 高速远程滑坡-碎屑流运动速度、堆积特征和能量转化是研究其致灾机制的重要因素,而模型试验、野外调查并不能全面揭示其成灾机理。文章以三溪村滑坡为例,采用PFC3D离散元模拟方法,揭示滑坡运动过程中的前部、中部和后部岩土体的速度演化分布、堆积特征和能量转化关系。研究结果表明:三溪村滑坡的残余摩擦系数为0.2时,模拟结果与实际堆积特征一致。前部、中部、后部岩土体到峰值速度存在差异,前部岩土体速度分布表现为显著的单峰型特征,而后部岩土体速度分布为双峰型特征。滑坡不同部位的岩土体堆积呈现层序分布;滑坡重力势能的转化中,摩擦耗能占总能量的52%,动能峰值时刻仅有15%的重力势能转化为动能。研究结果可为高速远程滑坡的运动机理分析和防灾减灾治理工程提供重要参考。

     

  • 图  1  滑坡发生后的遥感影像图

    Figure  1.  Remote sensing image after landslide

    图  2  三溪村滑坡模型图

    Figure  2.  The model of Sanxicun landslide

    图  3  无侧限抗压实验

    Figure  3.  The uniaxial compressive test

    图  4  不同残余摩擦系数滑坡体堆积情况

    Figure  4.  The accumulation of landslides with different residual friction coefficients

    图  5  数值模型滑坡堆积影像图

    Figure  5.  Remote sensing image after landslide

    图  6  前部岩土体颗粒速度

    Figure  6.  The velocity of the front rock mass

    图  7  中部岩土体颗粒速度

    Figure  7.  The velocity of the middle rock mass

    图  8  后部岩土体颗粒速度

    Figure  8.  The velocity of the rear rock mass

    图  9  不同部位岩土颗粒的平均速度

    Figure  9.  The average velocity of different parts of geotechnical particles

    图  10  横断面颗粒堆积分布特征

    Figure  10.  Distribution characteristics of cross-sectional particle accumulation

    图  11  能量值随时间变化曲线

    Figure  11.  Curves of energy over time

    图  12  能量转化率随时间变化曲线

    Figure  12.  Curves of energy conversion rate over time

    表  1  数值模型微观参数

    Table  1.   The numerical micro-parameters of the PFC model

    参数名称 单轴数值实验参数 微观参数取值
    颗粒半径/m 0.0006~0.0015 0.975~2.437
    球颗粒密度/(kg/m3) 2300 2300
    球颗粒刚度比/(kn/ks) 1 1
    球-球接触模量/GPa 1.48 1.48
    平行粘结刚度比 1 1
    球颗粒摩擦系数 0.677 0.1~0.4
    平行粘结法向强度/Pa 6e6 6e6
    平行粘结切向强度/Pa 6e6 6e6
    正向临界阻尼比 0.22 0.22
    切向临界阻尼比 0.2 0.2
    下载: 导出CSV
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  • 收稿日期:  2018-11-27
  • 修回日期:  2019-01-05
  • 刊出日期:  2019-08-28

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