| 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 |
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| 引用本文： | 胡晓波,樊晓一,唐俊杰.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[J].地质力学学报,2019,25(4):527-535. |
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| 作者姓名： | 胡晓波 樊晓一 唐俊杰 |
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| 作者单位： | 西南科技大学土木工程与建筑学院,四川 绵阳,621010;西南科技大学土木工程与建筑学院, 四川 绵阳621010;工程材料与结构冲击振动四川省重点实验室, 四川 绵阳621010 |
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| 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） |
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| 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。
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| 关 键 词： | 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 |
| 收稿时间： | 2018/11/27 0:00:00 |
| 修稿时间： | 2019/1/5 0:00:00 |
ACCUMULATION CHARACTERISTICS AND ENERGY CONVERSION OF HIGH-SPEED AND LONG-DISTANCE LANDSLIDE ON THE BASIS OF DEM: A CASE STUDY OF SANXICUN LANDSLIDE |
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| HU Xiaobo,FAN Xiaoyi and TANG Junjie.ACCUMULATION CHARACTERISTICS AND ENERGY CONVERSION OF HIGH-SPEED AND LONG-DISTANCE LANDSLIDE ON THE BASIS OF DEM: A CASE STUDY OF SANXICUN LANDSLIDE[J].Journal of Geomechanics,2019,25(4):527-535. |
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| Authors: | HU Xiaobo FAN Xiaoyi and TANG Junjie |
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| Institution: | 1.School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China2.Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621010, Sichuan, China |
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| 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 PFC3D 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 Sfront < Smiddle < Srear. 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. |
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| Keywords: | discrete element particle flow high-speed and long-distance landslide velocity energy conversion Sanxicun landslide |
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