筋土界面摩擦特性影响因素分析  

Study of influence factors on tendons-soil interface characteristic

作　　者：凌天清[1] 周滨 吴春波[1,3] 郑智能[1] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074 [2]广东佛开高速公路扩建工程管理处,广东佛山528231 [3]后勤工程学院军事建筑工程系,重庆400041

出　　处：《交通运输工程学报》2009年第5期7-12,共6页Journal of Traffic and Transportation Engineering

基　　金：广东省交通科技重点项目(2005.02)

摘　　要：以整体式单向聚乙烯土工格栅与钢塑复合加筋带为加筋材料,以含细粒土砂为填料,设计了高速公路拓宽工程加筋边坡。通过室内拉拔试验对填料在不同含水量和不同压实度条件下与土工格栅之间的摩擦特性进行分析,并对比了原样土工格栅、去除横肋的土工格栅和土工加筋带三者之间的界面摩擦特性。分析结果表明:在填料含水量高于填料的最佳含水量时,筋土界面强度随着含水量增加而降低,且变化明显,随着填料压实度的提高而不断增强,加筋效果也明显增强;土工格栅的横肋对筋土界面特性影响非常明显,贡献率高达50%以上。A rib-reinforced slope in expressway＇s widening engineering was designed, in which holistic and unilateral polyethylene geogrid and steel-plastic composite geobelt were taken as enhancement materials and sand with fine-grained soil was taken as fill. The friction performance of tendons-soil interface was analysed by pull-out test in laboratory under different water contents and compactions. The enhancement effects of original geogrid, the one without horizontal ribs and reinforcement geobelt were compared. It is found that when the fill＇s water content is higher than its optimum moisture content, the tendons-soil interface strength reduces with the increase of water content, which is obvious. With the rise of the fill＇s compaction, the interface strength increases unceasingly and the reinforcement effect is distinct. The horizontal ribs＇ contribution rate to the interface characteristic of reinforcement soil is over 50%.

关 键 词：道路工程 加筋土 拉拔试验 含水量 压实度 土工格栅横肋 界面摩擦特性 

分 类 号：U416.14[交通运输工程—道路与铁道工程]