水利学报2017，Vol.48Issue(4)：426-434,445,10.DOI:10.13243/j.cnki.slxb.20160829
土工格栅加筋砂土三轴试验离散元细观分析
Mesoscopic analysis of reinforced sand triaxial test using PFC3D
摘要
Abstract
On the basis of the results of single reinforced triaxial test in the laboratory,the discrete element PFC3D triaxial test numerical model is established,and the results are compared with the laboratory triaxial test results.The influence of reinforced layers changes on shear strength parameters and the microscopic parameters is analyzed,and soil particles contact force variation and macroscopic-mesoscopic mechanisms of geosynthetics reinforcement effect are discussed.The results show that reinforcement triaxial specimen peak strength,cohesion and internal friction angle increase with the increase of reinforcement layers,but the increase will gradually weakened,and the reinforcement effect of the triaxial specimen under low confining pressure is higher than that of the high confining pressure.The sliding fraction value of the triaxial specimen has a significant fluctuation with the increase of axial strain,which reflects the obvious contact slip and rotation in triaxial test.Due to the friction restrain effect of geosynthetics,the fluctuations of porosity and sliding fraction of reinforced specimen in the central region are relatively small,and the contact force corresponding to the middle part of the outer periphery is obviously less than that of sand triaxial test.The reinforcement materials play a role in diffusing stress and enhancing reinforcement of sandy soil.关键词
三轴试验/离散元方法/土工合成材料/界面作用Key words
triaxial test/discrete element method/geosynthetics/interface interaction分类
建筑与水利引用本文复制引用
王家全,张亮亮,陈亚菁,施春虎..土工格栅加筋砂土三轴试验离散元细观分析[J].水利学报,2017,48(4):426-434,445,10.基金项目
国家自然科学基金项目(51469005,51009030) （51469005,51009030）
广西自然科学基金项目(2015GXNSFAA139257,2015GXNSFAA139270) （2015GXNSFAA139257,2015GXNSFAA139270）
广西科技大学研究生教育创新计划项目(GKYC201627) （GKYC201627）
