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Shear band and strength of crushable agglomerates in direct shear box simulations of Discrete Element Method

Cheng, YP; Peng, Q; Hughes, L; (2008) Shear band and strength of crushable agglomerates in direct shear box simulations of Discrete Element Method. In: Burns, SE and Mayne, PW and Santamarina, JC, (eds.) DEFORMATION CHARACTERISTICS OF GEOMATERIALS, VOLS 1 AND 2. (pp. 357 - 364). I O S PRESS

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Abstract

Direct shear box (DSB) testing is a traditional method to study the engineering characteristics of shear strength and volume response of granular soils. DSB simulations of crushable agglomerates were carried out using the 2-Dimensional Particle Flow Code (PFC2D) a type of Discrete Element Method (DEM). Each 2D agglomerates was formed simply by bonding three disks together without initial overlapping. These agglomerates were allowed to be unbreakable, slightly breakable, or very breakable. By varying the properties of the tested agglomerates and the testing environment (including contact bond strength, density and vertical stress), the macroscopic features of stress-strain-volume responses and the microscopic features of shear band thickness were studied. Regardless of the simplified crushing nature and uniform strength of these agglomerates compared to that of soil grains, various engineering characteristics of a crushable soil were reproduced. With the existence of particle breaking, these include reducing the angle of friction with stress level, reducing dilatancy, and a lower critical state void ratio. The results also indicate that the thickness of the shear band, when defined by relative rotation, increases with the existence of particle crushing.

Type:Proceedings paper
Title:Shear band and strength of crushable agglomerates in direct shear box simulations of Discrete Element Method
Event:4th International Symposium on Deformation Characteristics of Geomaterials
Location:Atlanta, GA
Dates:2008-09-22 - 2008-09-24
ISBN-13:978-1-58603-908-0
Keywords:shear band, direct shear box, distinct element method, crushability
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering

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