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| FIELD TEST AND NUMERICAL CALCULATION OF RESTITUTION COEFFICIENT OF ROCKFALL COLLISION |
| ZHANG Guangcheng1，2，XIANG Xin3，TANG Huiming1 |
(1. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China；
2. Three Gorges Research Center for Geo-hazard，Ministry of Education，China University of Geosciences，Wuhan，Hubei 430074，China；3. China Three Gorges Corporation，Yichang，Hubei 443002，China) |
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Abstract For studying the characteristics and influence factors of restitution coefficient of rockfall collision，the field tests are carried out. By using the FASTCAM SA1.1 high-speed camera and the Motion Plus software，the velocities of rockfall before and after impact are obtained；and the normal restitution coefficient and tangential restitution coefficient are calculated. Meanwhile，the ANSYS/LS-DYNA software is adopted to simulate the test process；and the simulation results and test results are anastomotic well. The results show that：(1) While the ground material changes from fragment，accumulation layer to loose gravelly soil，the corresponding normal restitution coefficient decreases gradually；but the tangential restitution coefficient increases gradually. (2) The normal restitution coefficient is almost independent of the side length of rock block，incidence velocity and incidence angle；and it just affected by the physico-mechanical properties of ground material. (3) The tangential restitution coefficient is independent of the side length of rock block，but it increases with the incidence velocity and decreases with the incidence angle increase.
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Received: 03 August 2010
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| [1] BOZZOLO D，PAMINI B. Simulation of rock-falls down a valley side[J]. Acta Mechanica，1986，63(1)：113–130.
[2] BOURRIER F，DORREN L，NICOT F，et al. Toward objective rockfall trajectory simulation using a stochastic impact model[J]. Geomorphology. 2009，110(3/4)：68–79.
[3] GIANI G，GIACOMINI A，MIGLIAZZA，et al. Experimental and theoretical studies to improve rock fall analysis and protection work design[J]. Rock Mechanics and Rock Engineering，2004，37(5)：369–389.
[4] PARONUZZI P. Rockfall-induced block propagation on a soil slope，northern Italy[J]. Environmental Geological，2009，58(7)：1 451–1 466.
[5] MANGWANDI C，CHEONG Y，ADAMS M，et al. The coefficient of restitution of different representative types of granules[J]. Chemical Engineering Science，2007，62(1/2)：437–450.
[6] 秦志英，陆启韶. 基于恢复系数的碰撞过程模型分析[J]. 动力学与控制学报，2006，4(4)：294–298.(QIN Zhiying，LU Qishao. Analysis of impact process model based on restitution coefficient[J]. Journal of Dynamics and Control，2006，4(4)：294–298.(in Chinese))
[7] 何思明，吴 永，李新坡. 滚石冲击碰撞恢复系数研究[J]. 岩土力学，2009，30(3)：623–627.(HE Siming，WU Yong，LI Xinpo. Research on restitution coefficient of rock fall[J]. Rock and Soil Mechanics，2009，30(3)：623–627.(in Chinese))
[8] 沈 均，何思明，吴 永. 滚石对垫层材料的冲击特性研究[J]. 安徽农业科学，2009，37(17)：8 286–8 288.(SHEN Jun，HE Siming，WU Yong. Study on the impact properties of rock-fall on cushion material[J]. Journal of Anhui Agricultural Sciences，2009，37(17)：8 286–8 288.(in Chinese))
[9] 杨海清，周小平. 边坡落石运动轨迹计算新方法[J]. 岩土力学，2009，30(11)：3 411–3 416.(YANG Haiqing，ZHOU Xiaoping. A new approach to calculate trajectory of rockfall[J]. Rock and Soil Mechanics，2009，30(11)：3 411–3 416.(in Chinese))
[10] JONES C L，HIGGINS J D，ANDREW R D. Colorado rockfall simulation program，version 4.0(for windows)[R]. Colorado：Colorado Department of Transportation，Colorado school of Mines，Colorado Geological Survey，2000.
[11] Rocscience. Rocfall user manual：statistical analysis of rockfalls[M]. [S. l.]：Rocscience Inc.，2002：51–59
[12] GUZZETTI F，CROSTA G，DETTI R. STONE：a computer program for the three-dimensional simulation of rock-falls[J]. Computers and Geosciences，2002，28(9)：1 079–1 093.
[13] AZZONI A，BARBERA G，ZANINETTI A. Analysis and prediction of rockfalls using a mathematical model[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1995，32(7)：709–724.
[14] 佘淑华，陈新连. 基于ANSYS/LS-DYNA的非线性碰撞问题仿真分析[J]. 装备制造技术，2009，(8)：39–40.(SHE Shuhua．CHEN Xinlian. Emulate analysis of nonlinear impact questions with ANSYS/LS-DYNA[J]. Equipment Manufacturing Technology，2009，(8)：39–40.(in Chinese))
[15] AZZONI A，FREITAS M. Experimentally gained parameters，decisive for rock fall analysis[J]. Rock Mechanics and Rock Engineering，1995，28(2)：111–124.
[16] DAY R W. Case studies of rockfall in soft versus hard rock[J]. Environmental and Engineering Geoscience，1997，3(1)：133–140.
[17] CHAU K，WONG R，WU J. Coefficient of restitution and rotational motions of rockfall impacts[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(1)：69–77.
[18] 鲍四元，邓子辰. 利用DMSM方法求解弹性撞击恢复系数[J]. 动力学与控制学报，2005，3(4)：44–49.(BAO Siyuan，DENG Zichen. Solution of the coefficient of restitution for elastic impact using DMSM[J]. Journal of Dynamics and Control，2005，3(4)：44–49.(in Chinese))
[19] JOHNSON W. Impact strength of material[M]. London：Edward Arnold，1972：289–328.
[20] STRONGE W J. Impact mechanics[M]. Cambridge：Cambridge University Press，2000：45–48.
[21] GOLDSMITH W. Impact：the theory and physical behavior of colliding solids[M]. Dover，USA：Dover Publications，Inc.，2001：249–308
[22] 中华人民共和国行业标准编写组. 工程地质手册[S]. 4版. 北京：中国建筑工业出版社，2007.(The Professional Standards Compilation Group of People?s Republic of China. Handbook of engineering geology[S]. 4th ed. Beijing：China Architecture and Building Press，2007.(in Chinese)) |
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2011, Vol. 30 
