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

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

胡晓波^1,,
樊晓一^{1, 2, ,},
唐俊杰¹

1.
西南科技大学土木工程与建筑学院, 四川绵阳 621010
2.
工程材料与结构冲击振动四川省重点实验室, 四川绵阳 621010

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
计量
- 文章访问数: 303
- HTML全文浏览量: 110
- PDF下载量: 36
- 被引次数: 0
出版历程
- 收稿日期: 2018-11-27
- 修回日期: 2019-01-05
- 刊出日期: 2019-08-28

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

HU Xiaobo^1
,,
FAN Xiaoyi^{1, 2
, ,},
TANG Junjie¹

1.
School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
2.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621010, Sichuan, China

摘要

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PFC^3D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。
- 离散元颗粒流 /
- 高速远程滑坡 /
- 运动速度 /
- 能量转化 /
- 三溪村滑坡
Abstract: The velocity, accumulation characteristics and energy conversion are important factors in the study of the disaster-causing mechanism of high-speed and long-stance landslide; however, model test and field investigation can't fully reveal the mechanism. In this study, the landslide in Sanxicun was simulated by PFC^3D to reveal that the velocity evolution distribution, accumulation characteristics and energy conversion relationship of frent, middle and rear rock and soil during the landslide movement process. The results show that, when the residual friction coefficient of Sanxicun landslide is 0.2, the simulation results are consistent with the actual accumulation characteristics. When the front, middle and rear rock and soil achieve peak velocity, the time distribution is S_front < S_middle < S_rear. The velocity distribution of the front rock mass shows significant unimodal characteristic, while that of the rear rock mass is bimodal. The accumulation of rock and soil mass presents sequence distribution. In the transformation of gravitational potential energy of the landslide, friction energy accounts for 52% of the total energy, and only 15% of the gravitational potential energy at the peak of kinetic energy is converted into kinetic energy. The research results can provide reference for the analysis of the disaster-causing mechanism of high-speed and long-stance landslide and the project of disaster prevention and reduction.
- discrete element particle flow /
- high-speed and long-distance landslide /
- velocity /
- energy conversion /
- Sanxicun landslide
注释:

责任编辑：吴芳

HTML全文

图 1 滑坡发生后的遥感影像图

Figure 1. Remote sensing image after landslide

下载: 全尺寸图片幻灯片

图 2 三溪村滑坡模型图

Figure 2. The model of Sanxicun landslide

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图 3 无侧限抗压实验

Figure 3. The uniaxial compressive test

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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

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图 5 数值模型滑坡堆积影像图

Figure 5. Remote sensing image after landslide

下载: 全尺寸图片幻灯片

图 6 前部岩土体颗粒速度

Figure 6. The velocity of the front rock mass

下载: 全尺寸图片幻灯片

图 7 中部岩土体颗粒速度

Figure 7. The velocity of the middle rock mass

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图 8 后部岩土体颗粒速度

Figure 8. The velocity of the rear rock mass

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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

下载: 全尺寸图片幻灯片

图 10 横断面颗粒堆积分布特征

Figure 10. Distribution characteristics of cross-sectional particle accumulation

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图 11 能量值随时间变化曲线

Figure 11. Curves of energy over time

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图 12 能量转化率随时间变化曲线

Figure 12. Curves of energy conversion rate over time

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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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