JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2015, Vol. 45 ›› Issue (4): 50-56.doi: 10.6040/j.issn.1672-3961.0.2014.183

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Calibration of micro-parameters of parallel bonded model for rocks

JIANG Mingjing1,2,3, FANG Wei1, SIMA Jun1   

  1. 1. School of Civil Engineering, Wuhan University, Wuhan 430072, Hubei, China;
    2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
    3. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
  • Received:2014-07-07 Revised:2015-06-10 Online:2015-08-20 Published:2014-07-07

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Abstract: The micro-parameters of parallel bond model could not satisfy the compressive strength and tensile strength simultaneously, this was a problem in the simulation of rocks. A set of uniaxial tension tests and uniaxial compression tests of rocks were simulated to investigate this problem. First, DEM specimens with different porosity ratio and different nonuniform coefficient were calibrated according to the laboratory test results of Lac du Bonnet granite. Second, the deficiency of the parallel bond model was pointed out and the improved methods were proposed from the perspective of microscopic failure mechanism. The simulation results showed that the microscopic parameters satisfied tension strength was one order of magnitude deviated from the microscopic parameters, which could also satisfy compression strength. Tensile characteristics and shear characteristics were considered in the parallel bond model, while the influence of normal stress on the bond was ignored. This was the reason that the tension-compression strength ratio of rock was different from the experimental result. It was advised to use clumped particle model which could simulate particle breakage or cementation model based on laboratory tests.

Key words: parallel bonded model, uniaxial compression, macro-properties, uniaxial tension, discrete element method, microparameters

CLC Number: 

  • TU45
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