Railway trackbed assessment using the GPR technique

Loizos, A; Silvast, M; Dimitrellou, S

dc.contributor.author	Loizos, A	en
dc.contributor.author	Silvast, M	en
dc.contributor.author	Dimitrellou, S	en
dc.date.accessioned	2014-03-01T02:51:10Z
dc.date.available	2014-03-01T02:51:10Z
dc.date.issued	2007	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35414
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84858062061&partnerID=40&md5=3cd7aa24b6af045cb938aa71773cd7fb	en
dc.subject.other	Air-coupled	en
dc.subject.other	Automatic processing	en
dc.subject.other	Frequency antennas	en
dc.subject.other	Geophysical sensors	en
dc.subject.other	Global position systems	en
dc.subject.other	GPR techniques	en
dc.subject.other	Ground Penetrating Radar	en
dc.subject.other	Ground penetrating radar (GPR)	en
dc.subject.other	Hard copies	en
dc.subject.other	High water content	en
dc.subject.other	In-situ measurement	en
dc.subject.other	Layer thickness	en
dc.subject.other	Maintenance operations	en
dc.subject.other	Multiple antenna	en
dc.subject.other	Non destructive	en
dc.subject.other	Radar image	en
dc.subject.other	Railway system	en
dc.subject.other	Subsurface drainage pipe	en
dc.subject.other	Technical universities	en
dc.subject.other	Technological advances	en
dc.subject.other	Transportation mode	en
dc.subject.other	Transportation system	en
dc.subject.other	Antenna grounds	en
dc.subject.other	Data handling	en
dc.subject.other	Geological surveys	en
dc.subject.other	Ground penetrating radar systems	en
dc.subject.other	Groundwater flow	en
dc.subject.other	Natural water geochemistry	en
dc.subject.other	Pavements	en
dc.subject.other	Railroad transportation	en
dc.subject.other	Railroads	en
dc.subject.other	Soil mechanics	en
dc.subject.other	Trenching	en
dc.subject.other	Antennas	en
dc.title	Railway trackbed assessment using the GPR technique	en
heal.type	conferenceItem	en
heal.publicationDate	2007	en
heal.abstract	The increasing demand for fast and economical transportation systems sets railways as one of the most important transportation modes. In addition due to technological advances new trains are increasingly fast. This fact requires an improvement to the construction as well as to maintenance operations of railway systems. Knowledge of applying geophysical sensor techniques on pavements was transferred to railways by taking advantage of the ability of ground penetrating radar to map substructure conditions on a continuous non-destructive basis. The study examines pilot sections, which are integrated in the National Railway System of Greece and are representative of the Greek Railways regarding structural and operational elements. For the present study a Ground Penetrating Radar (GPR) system as well as the Videocar of the National Technical University of Athens have been used. The GPR system consists of an air-coupled 1GHz frequency antenna and a ground coupled 400 MHz antenna. Data was acquired between concrete and wood ties as well as from the ballast shoulders beyond the ends of the ties, using the two antennas with multiple antenna orientations and polarizations. Automatic processing of the data was developed to quickly generate hard copy sections of radar images. Substructure conditions were observed such as thickness of the ballast and sub ballast layers, variations in layer thickness along the track, pockets of water trapped in the ballast, and soft subgrades from high water content. In addition, locations and depths of subsurface drainage pipes, trenches, and utilities were quickly and continuously mapped. In addition to in-situ measurements a Global Position System (GPS) was used in order to record exact coordinates of the sections under study. © 2007 Taylor & Francis Group, London.	en
heal.journalName	Advanced Characterisation of Pavement and Soil Engineering Materials - Proceedings of the International Conference on Advanced Characterisation of Pavement and Soil Engineering Materials	en
dc.identifier.volume	2	en
dc.identifier.spage	1817	en
dc.identifier.epage	1826	en