差异沉降对路面结构附加变形影响的大比尺模型试验  

Large Scale Test on Additional Deformation of Pavement Widening with Differential Settlement

作　　者：翁效林[1] 张超 李常乐 尚淑萍[1] 李红艳[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]河南中原高速公路股份有限公司,河南郑州450052 [3]陕西省交通建设集团公司,陕西西安710075

出　　处：《中国公路学报》2013年第4期1-6,共6页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51008032);中国博士后科学基金项目(2011M501430);中央高校基本科研业务费专项资金项目(CHD2012JC011)

摘　　要：为合理描述新老路基差异沉降条件下路面结构层的附加变形问题,借助大型地基差异沉降平台,开展了新老地基差异沉降条件下拓宽沥青路面层影响机制大比尺模型试验研究。试验结果表明:在地基差异沉降作用下,沥青路面结构层整体处于受拉状态,下面层受到的地基差异沉降的影响最为明显,在地基差异沉降达到14cm时,路面结构面层开始出现塑性变形;新老路基中铺设土工格栅可以缓解下部地基差异沉降并减小路面结构层的附加应变;路面汽车荷载能在一定程度上缓解拓宽路基差异沉降导致的结构层附加变形;地基差异沉降会导致路面结构层与路基出现脱空从而产生局部弱支撑,在重力的作用下,沥青混凝土路面板呈现弯曲状态,路面表层会出现反坡。In order to clearly describe the additional deformation of pavement layers between the old and new subgrade with differential settlement,a full scale model test was carried out to study the strain response of asphalt concrete pavement layer using a large subgrade differential settlement platform.The results indicate that the entire pavement is in tension under the foundation differential settlement and the lower layer is more affected;plastic deformation will develop in surface layer when the differential settlement reaches 14 cm;geogrid in old and new subgrade can alleviate the lower foundation differential settlement and increase the additional deformation of the pavement;to some extent,the vehicle load can alleviate the additional deformation due to the differential settlement;upon the occurrence of hollows under the pavement,deformation will be reflected in the asphalt pavement layers in the form of crown under the action of gravity.

关 键 词：道路工程 道路拓宽 大比尺模型试验 差异沉降 附加变形 

分 类 号：U416.1[交通运输工程—道路与铁道工程]