Different particle surface properties will affect the shape,size and gradient of particle contact force field,and then change the binding force on the sample,for graded crushed stone.The stress evolution of sample side plate and bottom plate during California bearing ratio(CBR)test was analyzed,and the influence of sample particle micro-parameters on sample particle contact force field and sample binding force was explored.By comparing the influence of different stiffness ratio,friction coefficient and bond-ing strength(set the ratio as 1)on the shape of the contact force field of the sample.The results show that the slenderness ratio of the particle contact force field increases first and then decreases with the increase of the normal stiffness,taking the stiffness ratio of 6 as the boundary.The slenderness ratio of contact force field decreases with the increase of friction coefficient or bond strength.The normal and tangential parameters in the bond strength ratio in the relative motion of particles have different effects.Taking the bond strength ratio 4 as the boundary,the slenderness ratio of the contact force field increases first and then decreases with the increase of the normal bond strength.And with the increase of tangential bond strength,the slenderness ratio of the contact force field decreases first and then increases.The research results can provide some reference for the study of the correlation between the micro-parameters of graded crushed stone particles made from tunnel waste slag and the shape of its contact force field.
关键词
隧道工程/颗粒接触力场/加州承载比(CBR)试验/颗粒流模拟/细观参数
Key words
tunneling/particle contact force field/California bearing ratio(CBR)test/particle flow simulation/microscopic parameters
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