岩土力学Issue(4)：1181-1186,6.
节点突起影响格栅加筋性能的离散元研究
Study of influence of joint protuberance on geogrid reinforcement performance by discrete element method
摘要
Abstract
Effects of the interface characteristics between geogrid and soil and joint protuberance on the geogrid performance are investigated by three-dimensional discrete element method. To simulate the protuberant joint, minor particles are introduced;so that the pull-out test of triaxial geogrid with joint protuberance can be modeled thoroughly. Through analyzing the shear dilatancy effect of the interface between geogrid and soil, the inherent relationship between strength (macroscopic) and fabric anisotropy (microscopic) is revealed; meanwhile, the improvement of geogrid performance attributed to the protuberant joint is also proved. Numerical results show that larger deviation can be found between the curves of Fourier coefficient and pull-out force. In terms of the development of strength (macroscopic), its accuracy can be obtained via considering normal contact force and fabric evolution coefficient which reflects the degree of anisotropy. Moreover, with the existence of protuberant joint, the internal force distribution of longitudinal rib can be homogenized; larger relative displacement between geogrid and soil will be allowed; and the material properties could be well performed. The research results can provide reference for optimizing the geogrid reinforcement performance microscopically.关键词
节点突起/组构各向异性/拉拔试验/离散元法Key words
joint protuberance/fabric anisotropy/pull-out test/discrete element method分类
建筑与水利引用本文复制引用
苗晨曦,郑俊杰,崔明娟,谢明星,赵建斌..节点突起影响格栅加筋性能的离散元研究[J].岩土力学,2014,(4):1181-1186,6.基金项目
国家自然科学基金项目(No.50978112，No.51278216)；山西省交通建设科技项目(No.11-2-17)。 （No.50978112，No.51278216）
