Objectives:Because of high frequency of extreme weather,railway subgrade disaster shows a trend of increasing,great harmfulness and is hard to detect in advance.Even a small-size subgrade disaster may cause railway paralysis,which prevents the development of transportation.Many incidents illustrate that the earliest subgrade disaster always appeared in areas where no case ever reported before.It means that traditional monitoring methods are hard to detect hidden danger area.Thus,a promising method is ur-gent to be proposed for meeting the monitoring requirement for railway safety.Methods:First,the charac-teristics of subgrade disaster are summarized under different disaster-pregnant environments,and the advan-tages of various monitoring methods are discussed to find a collaborative applications method for early iden-tification of subgrade disaster.The potential hazards that may cause damage to subgrade structure and the deterioration degree of subgrade are considered as the main monitoring object of subgrade service status,in-cluding subgrade deformation monitoring,structural health monitoring,geological hazard monitoring along the railway,track irregularity,and external environmental monitoring.Second,an investigative approach based on the integration of space-air-train-ground muti-source techniques is proposed to detect the geohazards and monitor the service status of railway subgrade.It means that collaborative application of different moni-toring methods,cooperative analysis of different scales and resolutions data and collaboration of between various railway departments are required.Two monitoring schemes for subgrade disasters and service sta-tus of subgrade are proposed based on the integration of multi-source and multi-scale monitoring technique.Finally,the development direction of subgrade service status monitoring is discussed.Results and Conclu-sions:This monitoring system has been applied in the identification of subgrade service status in the Shang-hai-Nanjing high speed railway,which can quickly investigate the location of the disasters and the deteriora-tion degree of subgrade.
关键词
铁路路基/地质灾害/早期识别/服役状态/天-空-车-地调查技术/多源协同/监测体系
Key words
railway subgrade/geohazard/early detection/service status/space-air-train-ground investi-gation techniques/multi-sensor collaborative detection/monitoring system
维普
万方数据