中国铁道科学2017，Vol.38Issue(5)：1-8,8.DOI:10.3969/j.issn.1001-4632.2017.05.01
横肋间距对土工格栅拉拔特性影响试验研究
Experimental Study on Effect of Transverse Rib Spacing on Geogrid Pull-Out Characteristics
摘要
Abstract
To study the complicated mechanism of the interaction between reinforcement and soil,the laboratory pull-out tests of HDPE uniaxial tensile geogrid with different transverse rib spacing were performed to investigate the interaction characteristics between reinforcement and soil.The effects of transverse rib spacing and normal stress on the pull-out force at the interface between reinforcement and soil were analyzed.Results show that with the increase of transverse rib spacing,the maximum pull-out force at the interface between reinforcement and soil as well as the needed pull-out displacement for the maximum pullout force decrease gradually.Both the cohesion and internal friction angle also assume a decreasing trend.When the transverse rib spacing of geogrid is smaller,the pull-out curve shows the characteristics of strain hardening.With the increase of transverse rib spacing,it transforms from strain hardening to strain softening.When the transverse rib spacing of geogrid is fixed,the maximum pull-out force at the interface between reinforcement and soil increases gradually with the increase of applied normal stress.The friction coefficient of the interface between reinforcement and soil decreases gradually with the increase of transverse rib spacing and normal stress.The end bearing resistance of transverse rib plays a dominant role in pull-out force.Under the action of high stress,the effect of transverse rib reinforcement is more significant.The end bearing resistance of transverse rib contributes nearly 90％ to the maximum pull-out force at the interface between reinforcement and soil.关键词
土工格栅/拉拔试验/横肋间距/最大拉拔力/横肋端承阻力/筋土界面/摩擦系数Key words
Geogrid/Pull-out test/Transverse rib spacing/Maximum pull-out force/End bearing resistance of transverse rib/Interface between reinforcement and soil/Friction coefficient分类
交通工程引用本文复制引用
靳静,杨广庆,刘伟超..横肋间距对土工格栅拉拔特性影响试验研究[J].中国铁道科学,2017,38(5):1-8,8.基金项目
国家自然科学基金资助项目(51378322) （51378322）
中国铁路总公司科技研究开发计划项目(2015G006-I) （2015G006-I）
河北省交通工程结构力学行为演变与控制重点实验室资助项目(201503) （201503）
