Detection of Railway Ballast Damage by Vibration Measurement
作者单位：Department of Civil and Architectural EngineeringCity University of Hong Kong
会议名称：《The 16th Annual Conference of Hong Kong Society of Theoretical and Applied Mechanics 2012、The 1st Mainland-Hong Kong Youth Forum on Mechanics 2012、The 8th Shanghai-Hong Kong Forum on Mechanics and Its Application 2012》
会议日期：2012年
学科分类：08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程]
基 金：supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region China(Project No.CityU 115510)
关 键 词：Detection of Railway Ballast Damage by Vibration Measurement
摘 要：With the advent of high speed and high capacity railway systems,damage of the railway ballast(i.e.,the crash of ballast into smaller sizes) has become more and more *** main function of ballast is to hold the sleepers and rails in *** ballast damage will lead to rail buckling and so as to increase the chance of ***,the damage detection of the railway ballast plays an important role in railway *** railway companies mainly rely on visual inspection and destructive core test for ballast damage ***,visual inspection is only effective to detect ballast damage on the surface,the ballast damage under sleepers is impossible to be detected in this way,thus a practical railway ballast damage detection method is in *** the ballast under the sleeper is damaged,the stiffness of the ballast in supporting the sleeper will be *** change in stiffness will alter the vibration characteristics of the concrete *** the literature,some researchers propose to use in-situ vibration measurement(Lam et al.2010;Lam and Wong 2011) to estimate the change in ballast stiffness by following a model-based *** paper reports the results of the numerical and experimental case studies of the research work in Lam and Wong(2011).In the proposed method,the rail-sleeper-ballast system is modeled as a Timoshenko beam on elastic *** ballast stiffness is represented by the stiffness of the elastic *** reduction in ballast stiffness can then be estimated by model updating of the rail-sleeper -ballast system using the measured vibration data of the in-situ sleeper. To test the proposed method,a full-scale ballasted track was built in an indoor test panel.A series of well-designed impact hammer tests was carried out on the intact in-situ *** updating of the undamaged rail-sleeper-ballast system was employed to identify a representative model to represent the real *** this comput