Research on Normal Restitution Coefficient of Rockfall Collision
王南南WANG Nan-nan;陈福榜 CHEN Fu-bang;冯爱国 FENG Ai-guo
(中冶集团武汉勘察研究院有限公司,武汉 430000)
(Wuhan Survering-Geotechnical Research Institute Co.,Ltd. of MCC,Wuhan 430000,China)
摘要:在工程防护设计中,落石运动路径计算的准确性主要依靠于法向恢复系数的取值。室内物理模型试验利用DIMS9100分析系统对落石碰撞运动过程进行捕捉,采集不同落石大小、边坡坡度、入射速度和坡面材料条件下的速度参数,分析碰撞前后速度参数得到法向碰撞恢复系数取值。研究表明:法向恢复系数的取值与落石大小和入射速度的相关性不显著,仅受边坡坡度和坡面材料的力学性质影响;随土层、仿真草坪、混凝土的边坡坡度增大,相应的三种材料的刚度也增大,对应的法向恢复系数同样呈现出递增的趋势;实际工程应用时,考虑边坡坡度和坡面材料两种因素所取得的落石碰撞法向恢复系数区间为0.32~0.62,法向恢复系数相对已有的研究成果取值偏小,说明物理试验过程中速度在法向上折减程度相对较大。
Abstract: In the process of designing the engineering protection, the accuracy of calculating the trajectory of rockfall movement mainly depends on the value of normal restitution coefficient. The rockfall collision process is captured by DIMS9100 analysis system in the indoor physical model test where velocity parameters under different rockfall size, slope gradient, incident velocity and slope material conditions are collected. Then the normal collision restitution coefficient can be obtain by analyzing velocity parameters before and after collision. The results show that the normal restitution coefficient is not significantly associated with the size of rockfall and the incident velocity, but only related to the slope and the mechanical properties of slope materials; The material change from soil layer, simulated lawn to concrete, the corresponding stiffness increases as slope gradient of the soil layer, simulated lawn and concrete increases respectively, and therefore the normal recovery coefficient also shows an increasing trend. When the slope gradient and slope materials are considered in practical engineering applications, the normal restitution coefficient range of rockfall collision is 0.32~0.62 and the value of normal restitution coefficient is smaller than that of the existing data. It indicates that the velocity decreases greatly in the normal direction during the test.
关键词:运动轨迹;法向恢复系数;物理模型试验;折减程度
Key words: motion trajectory;normal restitution coefficient;physical model test;degree of reduction
中图分类号:TU443 文献标识码:A 文章编号:1006-4311(2022)18-133-05
DOI:10.3969/j.issn.1006-4311.2022.18.042.
文章出处:王南南,陈福榜,冯爱国. 落石碰撞法向恢复系数的试验研究[J]. 价值工程,2022,41(18):133-137.
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