岩土工程学报2013，Vol.35Issue(8)：1423-1428,6.
界面特性及填料粒径影响格栅加筋性能的离散元研究
Interface properties and influence of particle size on geogrid reinforcement performance by DEM
摘要
Abstract
Aiming at studying the development of the microstructure in the interface and evaluating the reinforcement effect of the particle size,elliptical group particles are generated with the assistance of "clump "method to factually simulate the shape properties of sand particles.A three-dimensional DEM model is established,and its validity is verified by comparing the laboratory and numerical results.The mechanical responses such as pull-out resistance,strain of geogrid as well as local void ratio are systematically analyzed,and the laws of development are revealed.The results from the pull-out tests show that the apparent cohesion greatly increases,while the friction angle varies little after the original filler is partly replaced by coarse aggregate.The macro and micro analyses reveal that to a greater extent the positions of particles in the replacement systems chang and that the increment of total pull-out resistance is mainly attributed to the increase of friction resistance.The research results may provide a new understanding for the mechanism study of the reinforcement interface from a mesoscopic view.关键词
土工格栅/拉拔试验/界面抗剪强度/离散元Key words
geogrid/ pull-out test/ interface shearing resistance/ discrete element method分类
建筑与水利引用本文复制引用
郑俊杰,苗晨曦,谢明星,张军..界面特性及填料粒径影响格栅加筋性能的离散元研究[J].岩土工程学报,2013,35(8):1423-1428,6.基金项目
国家自然科学基金项目(50978112,51278216) （50978112,51278216）
教育部留学回国人员科研启动基金项目(20091341) （20091341）
山西省交通建设科技项目(11-2-17) （11-2-17）
