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| Research on the Relationship between Mesoscopic and Macroscopic Mechanical Parameters of Cohesive Coarse Grained Soil |
| ZHAN Yong - xiang1，YAO Hai - lin1，ZHANG Jing - bo2 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan， Hubei 430071， China; 2. CCCC Second Highway Consultants Co. Ltd，Wuhan，Hubei 430056，China) |
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Abstract Abstract ： Research purposes ： In order to0 select accurately particle mesoscopic parameters0 to reflect macroscopic mechanical properties of granular materials，scaling lawthat describes relationship between micro and macro parameters of cohesive coarse grained soils is obtained by using dimensional analysis. A number of plane biaxial compression simulation tests are carried out for cohesive coarse grained soil， and based on Mohr - Coulomb failure criterion， the relationship is interpreted between particle mesoscopic parameters of cohesive materials， including particle stiffness
ratio， particle friction coefficient， particle contact bond strengtli ratio， and material macroscopic shear strengtli parameters，which can provide references for determining mechanics parameters of coarse grained soil particle material in the future.
Research conclusions ：( 1 ) The relationship between particle stiffness ratio and cohesion force is obvious logarithmic correlation，particle stiffnes ratio and internal friction angle meet linear correlation. Particles friction coefficient has a weak effect on cohesion force，and there is a polynomial relationship between them. While particles friction coefficient
has a greater influence on internal friction angle and there is logaritlimic correlation between them. Contact bond strength is significantly influence on cohesion force, but almost no impact on internal friction angle. ( 2 ) Particle contact bond strengtii ratio is the important factors to affect material shear failure form, the micro and macro mechanics parameters have different correlation under different shear failure form. ( 3 )The study results have directive meaning to quickly and reasonably determine the micro - parameters of PFC model.
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Received: 23 May 2016
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2016, Vol. 33 
