基于细观组分实际分布的花岗岩宏细观参数关系.PDFVIP

35 1 Vol.35 Supp.1 2016 5 Chinese Journal of Rock Mechanics and Engineering May 2016 1 12 1 徐金明 黄大勇 朱洪昌 (1. 200444 ；2. 213164) ()( )7 3 7 4 32 TU 45 A 2016)1263509 Relations between macro- and meso-scopic mechanical parameters of granite based on actual distributions of mesocompositions XU Jinming1HUANG Dayong12 ZHU Hongchang1 (1. Department of Civil Engineering Shanghai UniversityShanghai200444China 2. Department of Civil Engineering Changzhou Institute of Engineering TechnologyChangzhouJiangsu213164China) Abstract Rock is generally composed of various meso-compositions. The type and interaction between these compositions may affect the macro mechanical properties. Taking the Beishan granite as an examplethe video images photographed during the laboratory test and the threshold segmentation technique were used to determine the actual types and locations of the various compositions. The particles and cements of the compositions were then assumed as disks and parallel bonds in simulation. The meso-scale mechanical properties were characterized with seven parametersincluding the elasticity modulusstiffness ratio and frictional coefficient of the particles and the elasticity modulusstiffness ratioaverage normal and tangential strengths of parallel bonds. Macro-scale mechanical properties were characterized with three parametersincluding the elasticity modulusPoissons ratio and peak stress of the specimen. The particle flow code and the pixel and particle loops were combined to establish the particle flow model based on the actual compositions. Thirty-two orthogonal simulation