Meso parameter optimization of discrete element model of frozen ballast uniaxial compression tests
Aiming at effective and accurate determination of the discrete element parameters,Plackett-Burman experimental design and Box-Behnken response surface design were adopted to optimize discrete element model paramerters of frozen ballast uniaxial compression tests.Linear contact elastic modulus,friction coefficient,bonding elastic modulus,tensile strength and cohesive force were chosen as experimental factors.Macroscopic elastic modulus and compressive strength of frozen specimens were selected as experimental indicators.Plackett-Burman experimental design was employed to screen for significant factors,and Box-Behnken response surface design was used to optimize and verify discrete element parameters.The optimized results show that linear contact elastic modulus,friction coefficient and bonding elastic modulus are significant factors.The corresponding optimal discrete element parameters are 62.461 GPa,0.281,and 8.109 GPa,respectively.The relative errors of macroscopic elastic modulus and compres-sive strength between results obtained with optimized parameters and those from physical experiments are 0.97%and 0.19%,respectively.This optimization method may shed some light on discrete element parameters determination.
uniaxial compression testfrozen ballastdiscrete element(DEM)Plackett-Burman designBox-Behnken response surface test
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