公路交通桥头跳车成因探讨  

Research on the Causes of Bump at Bridge-head in Highway Traffic

作　　者：吴福泉 王国华 廖碧海[2] 黄远亮 

机构地区：[1]江西省赣粤高速九景管理处,九江市332000 [2]华中科技大学,武汉市430074

出　　处：《公路》2014年第7期90-94,共5页Highway

基　　金：江西省交通运输厅重点科技项目;项目编号2011C0053

摘　　要：对某市40座现有桥梁桥头损伤的情况进行了调查,结果表明17.5%的桥头存在中等程度以上的跳车现象。用有限元软件对桥头路基建模分析表明,桥头后背填土与路面结构间存在脱空。埋设压力盒对桥头路基应力的监测表明,桥头后背填土横向应力随路面荷载增大而减小。这表明桥台结构和桥台后背填土间存在分离现象,造成路面结构在桥台处弯曲破坏,形成开裂和沉陷,引起车辆通过时发生跳车现象。In this paper, investigations to bridge-head damages for 40 bridges are made in one city, and the results show that bumping phenomenon exist on more than 33% of the bridges. Modeling for the bridge-head subgrade by finite element software indicates that there is cavity between bridge-head backfill and road surface structure. The stress data of bridge-head subgrade which is monitored by the buried pressure cells show that the transverse stress of bridge-head backfill decreases while the road load increases. It means that there is separation between abutment structure and abutment back fill, which has caused road surface structure bending around the abutment, then crack and sinking happen, which may cause bumps when cars passing by.

关 键 词：桥头跳车 成因 调查 测试 横向应力 

分 类 号：U416.1[交通运输工程—道路与铁道工程]