路桥过渡段路基工后沉降监测试验研究  

Research on the In-situ Monitoring of Post-construction Settlement of Bridge-subgrade Transition Section

作　　者：贾亮[1] 梁荣 姚凯[2] 

机构地区：[1]兰州理工大学,兰州730050 [2]新加坡国立大学,新加坡117576

出　　处：《铁道工程学报》2017年第9期18-21,82,共5页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51568044);兰州理工大学中青年骨干教师出国交流基金项目

摘　　要：研究目的:台背路基沉降是路桥过渡段差异沉降和桥头跳车的主要原因。为探讨路桥过渡段路基在自重应力和汽车荷载作用下的工后沉降,在兰永一级公路某一路桥过渡段布置单点沉降计对过渡段路基工后沉降进行长期监测,即分别在桥梁台背行车道和路肩位置布置两列沉降计,对路基的沉降及稳定性做长期观测,分析路基沉降随时间和空间的变化规律,从而为公路建设中路桥过渡段沉降研究提供基础数据。研究结论:(1)路肩位置沉降大于行车道位置沉降;(2)路基沉降随时间增加而增大,过渡段路基填筑结束1年后沉降趋于稳定;(3)汽车荷载作用下路基沉降不会出现较大的增长趋势;(4)对数模型能较真实地反映路基工后沉降规律;(5)本研究结论可为路桥过渡段的设计和施工提供指导。Research purposes： The settlement of back fill behind abutment is the main cause for the differential settlement and the vehicle bumping at bridge - head. To explore the post - construction settlement of bridge - subgrade transition section under self weight and vehicle load, in - situ monitoring of subgrade settlement is carried out on the Lanyon highway. Settlement cells are embedded in various depths of the driveway and the shoulder of highway. Long - term settlement monitoring is conducted to investigate the variation of settlement with time and space, to provide a basic data for future research on bridge -subgrade transition section in highway construction. Research conclusions： （ 1 ） The settlement of highway shoulder is greater than that of the driveway ; （ 2 ） The settlement of subgrade will increase with time, while the settlement of bridge - subgrade transition section tends to be stable after one year; （ 3 ） The vehicle load has insignificant effect on the subgrade settlement ; （4） Logarithm models can predict the post - construction settlement of the subgrade accurately ; （5） This research achievements can provide the reference for the design and construction of bridge - subgrade transition section.

关 键 词：路桥过渡段 试验研究 工后沉降 

分 类 号：TU476[建筑科学—结构工程]