Investigation of differential movement at railroad bridge approaches through geotechnical instrumentation  

作　　者：Debakanta MISHRA Erol TUTUMLUER Timothy D.STARK James P.HYSLIP Steven M.CHRISMER Michael TOMAS 

机构地区：[1]Department of Civil and Environmental Engineering,University of Illinois at Urbana-Champaign,Urbana,USA [2]HyGround Engineering,LLC,Williamsburg,Massachusetts,USA [3]National Railroad Passenger Corporation(Amtrak),Philadelphia,USA

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2012年第11期814-824,共11页浙江大学学报（英文版）A辑（应用物理与工程）

摘　　要：Railway transitions experience differential movements due to differences in track system stiffness,track damping characteristics,foundation type,ballast settlement from fouling and/or degradation,as well as fill and subgrade settlement.This differential movement is especially problematic for high speed rail infrastructure as the 'bump' at the transition is accentuated at high speeds.Identification of different factors contributing towards this differential movement,as well as development of design and maintenance strategies to mitigate the problem is imperative for the safe and economical operation of both freight and passenger rail networks.This paper presents the research framework and initial instrumentation details from an ongoing research effort at the University of Illinois at Urbana-Champaign.Three bridge approaches experiencing recurrent geometry problems were instrumented using multidepth deflectometers(MDDs) and strain gages to identify different factors contributing to the development of differential movements.Railway transitions experience differential movements due to differences in track system stiffness,track damping characteristics,foundation type,ballast settlement from fouling and/or degradation,as well as fill and subgrade settlement.This differential movement is especially problematic for high speed rail infrastructure as the ＇bump＇ at the transition is accentuated at high speeds.Identification of different factors contributing towards this differential movement,as well as development of design and maintenance strategies to mitigate the problem is imperative for the safe and economical operation of both freight and passenger rail networks.This paper presents the research framework and initial instrumentation details from an ongoing research effort at the University of Illinois at Urbana-Champaign.Three bridge approaches experiencing recurrent geometry problems were instrumented using multidepth deflectometers（MDDs） and strain gages to identify different factors contributing to the development of differential movements.

关 键 词：Track transition Differential movement Bridge approach Multidepth deflectometer(MDD) Bump at the end of the bridge Strain gage 

分 类 号：U442.2[建筑科学—桥梁与隧道工程]