Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (S1): 503-510.doi: 10.16285/j.rsm.2018.1678

• Numerical Analysis • Previous Articles     Next Articles

Three-dimensional discrete element simulation of random breaking strength and size effect in single particle splitting test of rockfill

ZHOU Meng-jia1, WEN Yan-feng1, DENG Gang1, WANG Yun-jia2, SONG Er-xiang2   

  1. 1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 2. Department of Civil Engineering, Tsinghua University, Beijing 100084, China
  • Received:2018-09-09 Online:2019-08-01 Published:2019-08-18
  • Supported by:
    This work was supported by the National Key Research Program of China(2018YF0407103, 2017YFC0404803) and Fundamental Research Funds for IWHR(GE0145B562017).

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Abstract: The single particle shape is irregular in the rockfill, which is characterized as random strength and size effect. The development of rockfill particle model is the basis of particle flow simulation in laboratory tests of rockfill materials. Based on the micro-crack propagation mechanism of particle breakage, a random crack model with three-dimensional shape is carefully proposed in this paper. Furthermore, the parameters of model are analyzed and discussed. The model can reasonably simulate the behavior of brittle splitting, Weibull distribution and size effect of the rock strength. It is the premise of in-depth simulation analysis of particle flow simulation of damming material crushing and scale effect. The single particle numerical test shows that the particle shape has a significant influence on the breaking mode and particle strength under the same lithological material and fracture distribution. The more irregular the particle is, the greater the dispersion of particle strength.

Key words: rockfill particle, crack, breakage, size effect, shape

CLC Number: 

  • TU 452
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