Roles of model size and particle size distribution on macro-mechanical properties of Lac du Bonnet granite using flat-joint model. (November 2018)

• Record Type: Journal Article
• Authors: Li, Kaihui; Cheng, Yungming; Fan, Xiang
• Is Part Of: Computers and geotechnics. Volume 103(2018)
• Page Start: 43
• Page End: 60
• Publication Date: 2018-11
• Subjects: Size effect -- Particle size distribution -- Flat-joint model -- Uniaxial compression test -- Brazilian test; Engineering geology -- Data processing -- Periodicals; Soil mechanics -- Data processing -- Periodicals; Rock mechanics -- Data processing -- Periodicals; 624.1510285
• DOI: 10.1016/j.compgeo.2018.07.007
• Languages: English
• ISSNs: 0266-352X

Abstract

Abstract: In this study, a new calibration procedure was proposed to calibrate the micro-parameters for the flat-joint model. Both uniaxial compression and Brazilian test simulations were conducted on standard and same-porosity specimens using flat-joint model. With increasing model size, the uniaxial compression strength (UCS), crack-initiation stress, Young's modulus and Poisson's ratio decrease initially until achieving stable values, while the Brazilian tensile strength (BTS) follows the descending trend and UCS/BTS maintains increasing with increasing model size. It is found that BTS is best fitted by the fracture energy and multifractal size-effect models for which the fitting constants are functions of the grain size heterogeneity ( d max / d min ). All the macro-properties are found to decrease with increasing d max / d min . It is also demonstrated that the constitutive contact model affects the effects of model size and particle size distribution.