Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (3): 665-672.doi: 10.16285/j.rsm.2020.0992

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Laboratory investigation of the effect of rockfall shape and size on coefficient of restitution

JI Zhong-min1, TANG Yi-ju2, 3, WU Fa-quan4, LIU Jing3, CHEN Tian-li5, CHEN Zhi-jian5   

  1. 1. School of Earth Science and Engineering, Hebei University of Engineering, Handan, Hebei 056038, China; 2. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, China; 3. Department of Resources and Environment, Henan College of Industry & Information Technology, Jiaozuo, Henan 454003, China; 4. School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; 5. School of Earth Science and Engineering, Hohai University, Nanjing, Jiangsu 211100, China
  • Received:2020-07-14 Revised:2020-12-18 Online:2021-03-11 Published:2021-03-15
  • About author:姬中民，男，1988年生，博士，讲师，主要从事边坡落石灾害方面的研究工作
  • Supported by:
    This work was supported by the Jiangsu Province Policy Guidance Program(BY2015002-05).

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Abstract: In order to study the effect of rockfall shape and size on the coefficient of restitution (COR), ten test blocks with different typical shapes and five test blocks with different sizes were adopted to conduct rockfall impact tests by a specially designed device. Based on the impact dynamics theory, the analysis of test results show that the normal COR (Rn) is very sensitive to the change of the block shape, and the Rn values of the non-angular shaped blocks are significantly higher than that of the angular shaped blocks. The Rn values of five non-angular shaped blocks are spherical > ellipsoid > cone with spherical base > cylinder > disk, and those of five angular shaped blocks are icosahedron > cube > tetrahedron > cuboid > triangle. Considering the geometric configuration and surface area distribution characteristics of the blocks, a new comprehensive shape quantification index-shape factor (?) is introduced, which has strong linear positive correlations with the Rn values of non-angular and angular shaped blocks respectively. Compared with Rn, the effect of the block shape on the tangential COR (Rt) is relatively weak, and the overall Rt values of the angular shaped blocks are slightly larger than that of the non-angular shaped blocks. Moreover, the size of the block has a significant impact on Rn and Rt. There are good linear negative correlations between the test block size and Rn and Rt. The rules obtained in this study provide important references for accurate prediction of rockfall disasters.

Key words: rockfall, shape, size, coefficient of restitution, shape factor

CLC Number: 

  • P642.2
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