Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (6): 2416-2426.doi: 10.16285/j.rsm.2018.0346

• Numerical Analysis • Previous Articles     Next Articles

Discrete element analysis of the particle shape effect on packing density and strength of rockfills

WANG Yun-jia, SONG Er-xiang   

  1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China
  • Received:2018-07-30 Online:2019-06-11 Published:2019-06-22
  • Supported by:
    This work was supported by the National Program on Key Basic Research Project of China (973 Program) (2014CB047003).

Abstract: Aggregate shape not only reflects the formation history, but also plays an important role in the mechanical properties of granular materials, and the effect of aggregate shape deserves further study. In this research, the three-dimensional particle flow code, FPC3D, is used and five particle models are generated according to the actual aggregate shape. The process of obtaining different relative density samples in numerical experiments is proposed. The effect of sphericity on the maximum and minimum void ratio is discussed, and the conclusion is basically consistent with the statistical results of the existing experiments. Numerical tests of isotropic compression and triaxial compression are carried out on the samples consisting of different shape aggregates, and the void ratio and relative density are selected as density control indexes respectively. The evolution of four micromechanical indexes with strain including coordination number, particle orientation, deviator fabric and branch vector is studied. The data show that when the particles are well-rounded, the sphericity has less influence on the peak friction angle. Instead, it mainly affects the residual friction angle. When the aggregate shape changes, the coordination number affects the strength but does not play a decisive role. The particle shape mainly influences the macroscopic performance by affecting the degree of anisotropy of contact and contact force in sample.

Key words: discrete element method, particle shape, packing density, strength, microscopic parameters

CLC Number: 

  • TU411
[1] XU Gang, ZHANG Chun-hui, YU Yong-jiang, . Experiments of overburden breaking and compression frame of fully mechanized caving face and the prediction model [J]. Rock and Soil Mechanics, 2020, 41(S1): 106-114.
[2] GUI Yue, WU Cheng-kun, ZHAO Zhen-xing, LIU Sheng-jun, LIU Rui, ZHANG Qiu-min. Effects of microbial decomposition of organic matter on engineering properties of peat soil [J]. Rock and Soil Mechanics, 2020, 41(S1): 147-155.
[3] LIU Jie, YANG Yu-hua, YAO Hai-lin, LU Zheng, YUE Chan, . Experimental study on treatment of dispersive clay based on different modification methods [J]. Rock and Soil Mechanics, 2020, 41(S1): 163-170.
[4] ZOU Xian-jian, WANG Yi-teng , WANG Chuan-ying, . Three-dimensional morphological feature of rock structural surfaces and dominant anti-slip direction using the borehole images [J]. Rock and Soil Mechanics, 2020, 41(S1): 290-298.
[5] BAO Ning, WEI Jing, CHEN Jian-feng. Three dimensional discrete element analysis of soil arching in piled embankment [J]. Rock and Soil Mechanics, 2020, 41(S1): 347-354.
[6] LI Li-hua, YU Xiao-ting, XIAO Heng-lin, MA Qiang, LIU Yi-ming, YANG Xing, . Mechanical properties of reinforcement about rice husk ash mixed soil [J]. Rock and Soil Mechanics, 2020, 41(7): 2168-2178.
[7] GAO Wei, HU Cheng-jie, HE Tian-yang, CHEN Xin, ZHOU Cong, CUI Shuang, . Study on constitutive model of fractured rock mass based on statistical strength theory [J]. Rock and Soil Mechanics, 2020, 41(7): 2179-2188.
[8] YANG Ji-ming, ZHANG Xiao-yong, ZHANG Fu-you, ZENG Chao-feng, MEI Guo-xiong, . Mesoscopic study on bearing characteristics of pile foundation under pile-soil-cap combined interaction in sand [J]. Rock and Soil Mechanics, 2020, 41(7): 2271-2282.
[9] YUAN Qing-meng, KONG Liang, ZHAO Ya-peng, . An elastoplastic model for energy soils considering filling and bonding effects [J]. Rock and Soil Mechanics, 2020, 41(7): 2304-2312.
[10] MAO Hao-yu, XU Nu-wen, LI Biao, FAN Yi-lin, WU Jia-yao, MENG Guo-tao, . Stability analysis of an underground powerhouse on the left bank of the Baihetan hydropower station based on discrete element simulation and microseismic monitoring [J]. Rock and Soil Mechanics, 2020, 41(7): 2470-2484.
[11] WU Zai-hai, JI Hong-guang, JIANG Hai-qiang, QI Zhao-jun, KOU Yun-peng, . Study of mechanical properties of frozen saline cemented tailings backfill [J]. Rock and Soil Mechanics, 2020, 41(6): 1874-1880.
[12] YU Lu, YANG Qing, YANG Gang, ZHANG Jin-li. Analysis of the resistance of elliptical tip of torpedo anchor by plastic limit analysis [J]. Rock and Soil Mechanics, 2020, 41(6): 1953-1962.
[13] LIU Xin-yu, ZHANG Xian-wei, YUE Hao-zhen, KONG Ling-wei, XU Chao, . SHPB tests on dynamic impact behavior of granite residual soil [J]. Rock and Soil Mechanics, 2020, 41(6): 2001-2008.
[14] XU Dong-sheng, HUANG Ming, HUANG Fo-guang, CHEN Cheng. Failure behavior of cemented coral sand with different gradations [J]. Rock and Soil Mechanics, 2020, 41(5): 1531-1539.
[15] LIU Hai-feng, ZHU Chang-qi, WANG Ren, WANG Xin-zhi, CUI Xiang, WANG Tian-min, . Shear test on reef limestone-concrete bonding interface [J]. Rock and Soil Mechanics, 2020, 41(5): 1540-1548.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!