粗粒土颗粒接触力学特性及细观接触模型研究

doi:10.13722/j.cnki.jrme.2017.1657

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Abstract The inter-particle contact of coarse-grained soils consist of limestone is simplified as point-surface contact. The particle contact models of coarse-grained soils are obtained through experimental investigation on the normal and tangential contact properties. The large shear tests of coarse-grained soils are simulated numerically with the discrete element method(PFC) using proposed micro contact models. The contact models and micro parameters are verified by comparing simulated results with measured data. The contact behaviors and contact models of coarse-grained soils are further discussed. The results show that the relationship between contact forces and displacements are fitted with power functions with an exponent less than 1. In order to measure the tangential contact stiffness，the tangential force corresponding to the tangential displacement of 5mm is defined as the tangential contact strength，particularly，the peak tangential force is defined as the contact strength if a peak value occurs. Comparing the simulated results of large shear tests with measured data shows that the calculation errors are really small for soils with large particle diameters(2–5，1–2 cm). For the grading samples with smaller granules，the calculation errors are larger.

Key words： soil mechanics particle contact micro scale particle flow code contact model coarse grained soil

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	Articles by authors
	WANG Zihan1
	WANG Pengju1
	JING Xiaokun1
	ZHOU Jian2
	XIAO Chengzhi1

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WANG Zihan1,WANG Pengju1,JING Xiaokun1, et al. A study on inter-particle contact behaviors and micro contact models of coarse-grained soil[J]. , 2018, 37(8): 1980-1992.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1657 OR http://www.rockmech.org/EN/Y2018/V37/I8/1980

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