土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (2): 224-229.

• 专题论述 • 上一篇    下一篇

基于离散元的落石碰撞恢复系数影响因素研究

张支璨1，闫金洲2,3，江 巍2,3   

  1. （1.福建水利电力职业技术学院，福建永安 366000；2.三峡库区地质灾害教育部重点实验室,湖北宜昌 443002；3.三峡大学土木与建筑学院，湖北宜昌 443002）
  • 收稿日期:2021-12-16 修回日期:2021-12-24 出版日期:2022-04-30 发布日期:2022-04-27
  • 作者简介:张支璨（1979-），男，讲师，研究方向为土木工程设计、施工。

Factors that Affecting the Restitution Coefficient in Rockfall Analysis Using Discrete Element Method

ZHANG Zhican1, YAN Jinzhou2,3, JIANG Wei2,3   

  1. (1.Fujian Polytechnic of Water Conservancy and Electric Power, Yongan 366000;
    2.Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, Yichang 443002;
    3.College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002)
  • Received:2021-12-16 Revised:2021-12-24 Online:2022-04-30 Published:2022-04-27

摘要： 落石碰撞恢复系数是落石运动轨迹计算的控制性参数，取值是否合理直接影响落石防护工程的有效性。采用离散元软件MatDEM对落石碰撞坡面的过程进行模拟，分析了坡面岩土体性质、冲击速度和入射角对碰撞恢复系数的影响。全面正交实验的极差分析表明，坡面岩土体性质因素对法向和切向碰撞恢复系数影响的显著性水平最高。法向碰撞恢复系数随着边坡坡面硬度增加而增大，随着入射角增加而减小，随冲击速度增加而减小。切向碰撞恢复系数随着边坡坡面硬度增加而增大，随冲击速度增加而减小。坡面坚硬程度越高，碰撞恢复系数值越离散。

关键词: 落石, 碰撞恢复系数, 影响因素, 离散元

Abstract: In the rockfall analysis, the restitution coefficient is an essential parameter for the prediction of the rock trajectory. The success of a rock fall mitigation project is strongly influenced by an accurate determination of the restitution coefficient. In this paper, the MatDEM, a discrete element software, is utilized to simulate the process that a falling rock impacts a slope. The influence of the rock and soil properties of the slope, the impact velocity and the incident angle on the restitution coefficient are also investigated. Range analysis on the results of the overall orthogonal experiments shows that the rock and soil properties of the slope have the most significant impact on the restitution coefficient. The normal restitution coefficient increases when the slope hardness improves and decreases when improving the incident angle and the impact velocity. The tangential restitution coefficient increases when the slope hardness improves and decreases when improving the impact velocity.

Key words: rockfall, restitution coefficient, factors, discrete element method

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