平行黏结模型中细观参数对宏观特性影响研究

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Abstract According to the theoretical analysis combining with the numerical simulation method，the effect of microparameters on macroproperties of parallel bonded model is investigated systematically. Firstly，the theoretical formulas between microparameters and macroproperties are proposed qualitatively；then，the quantitative relationships are put forward by PFC2D software. The research result shows that：(1) The Young?s modulus of the calculation model is mainly determined by the contact Young?s modulus of particles and bonded Young?s modulus of particles；and they are in a linear relationship with the Young?s modulus all. What?s more，The Young?s modulus is affected by contact stiffness ratio of particles，bound stiffness ratio of particles and particle size；and the three ones are logarithmic relationship with the Young?s modulus all. (2) The Poisson?s ratio is mainly determined by stiffness ratio of particles and they are in a linear relationship. Simultaneously，it is slightly affected by particle size. (3) The compressive strength is mainly determined by bound stress ratio of particles ?b，m/?b，m；and it is slightly affected by friction factor ?. When 0＜?b，m/?b，m＜2，the compressive strength is mainly influenced by bound tangent stress?b，m；when ?b，m/?b，m≥2，it is mainly influenced by bound normal stress ?b，m. Then the correlative relations with certain referential significance are given；and the reliability of correlative relations is proved by case study. The study has directive meaning to quickly and reasonably determine the microparameters of PFC model.

Key words： numerical analysis parallel bonded model microparameters macroproperties

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/I7/1491

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