岩土工程学报2015，Vol.37Issue(9)：1692-1697,6.DOI:10.11779/CJGE201509018
堆石料剪切过程中的颗粒破碎研究
Particle breakage of rockfill during triaxial tests
摘要
Abstract
The particle breakage directly modifies the structure of the rockfill, influencing its dilatancy, friction angle, strength, permeability and creep deformation. However, the breakage law of the rockfill during shearing is still unclear. The particle breakage of the basalt rockfill of Gushui concrete face rockfill dam during the sample preparation, consolidation and drained triaxial shearing is studied by using the consolidated-drained triaxial tests. The research shows that the sample preparation of the rockfill generates notable particle breakage. The isotropic consolidation of the sample generates little particle breakage. Under low confining pressure, the particles can freely roll over and slide, and there is little particle breakage during the shearing. Under high confining pressure, the rolling and sliding of the particles are limited, which increases the interlocked force among the particles. And the particle breakage increases with shear strain. During the particle breakage, the large particles break first. The diameter of the broken particle decreases with the increasing confining pressure. The content of the particle less than 0.5 mm always increases with the increasing pressure and the amplification also increases with the increasing confining pressure. Under high confining pressure, the stress and shear strain both influence particle breakage. The relationship between the relative breakage parameterBr and the shear strain under the same confining pressure can be described by hyperbolic formula.关键词
堆石料/颗粒破碎/排水三轴试验/相对破碎参量Key words
rockfill/particle breakage/drained triaxial test/relative breakage parameter分类
建筑与水利引用本文复制引用
贾宇峰,王丙申,迟世春..堆石料剪切过程中的颗粒破碎研究[J].岩土工程学报,2015,37(9):1692-1697,6.基金项目
国家自然科学基金项目(51109027,51179024,51379029) （51109027,51179024,51379029）
中央高校基本科研业务费专项资金项目(DUT12LK11) （DUT12LK11）
