新型土工格栅加筋土路堤模型试验研究  

Model Tests on Geogrid Reinforced Embankment

作　　者：郭小川[1] 刘德富[1] 肖衡林[1] 

机构地区：[1]湖北工业大学土木工程与建筑学院,湖北武汉430068

出　　处：《湖北工业大学学报》2014年第2期5-9,共5页Journal of Hubei University of Technology

基　　金：国家自然科学基金项目(51178166);教育部重点项目(2010133);湖北省创新群体项目(2012FFA035)

摘　　要：通过室内模型试验,对竖向荷载作用下三向土工格栅加筋效果进行了研究,研究了格栅埋设于底部、中部和顶部等8种工况下,坡体的变形情况和路堤的破坏模式。研究结果表明：加筋能降低路堤坡体的总沉降量,铺筋一层格栅比不铺格栅减小了13%~23%,铺两层格栅后比不铺格栅筋小13%~33%,铺三层格栅后比不铺格栅筋沉降小了10%;加筋大大提高了坡体的极限承载力,加筋层数越多承载力越大,加筋三层或承载力最大,比不加筋增大了2.2倍;路堤开始加载到破坏,坡体的破坏滑动面从坡顶延伸到坡脚处,但格栅的存在影响破坏面的位置,由于格栅的刚度较大,破坏面不能通过格栅向下延伸,破坏面只能从坡顶部延伸到格栅铺设位置之上,不能通过格栅再向下延伸;格栅加筋能增强路堤的稳定性,在一定程度上控制裂缝的开展。Based on the laboratory model tests,the role of geogrid reinforcement in embankment via vertical load on embankment destruction was studied.The failure model with the geogrid embedded in different locations was studied as well.The results are as follows.The strain of the geogrid layer in the embankment is significantly different.The strain in the axes of the embankment is 1.4% while in the edge it is smaller than 0.15%.The stress of the geogrid is different in different layers spread in different locations. The stress of the top layer is smaller and that of the bottom is greater.The center layer is 14%~30%bigger than the top layer.In addition,the existence of geogrid affects the location of the slide surface of the embankment.The result can provide references for the design and construction of reinforced embankment.

关 键 词：土工格栅 路堤 模型试验 变形 稳定性 

分 类 号：U411[交通运输工程—道路与铁道工程]