Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Dynamic & Cyclic behaviour of ballast in the long term as detrermined in Cedex¿s track box
Year:2013
Research Areas
  • Civil engineering
Information
Abstract
The 6 cylinder servo-hydraulic loading system of CEDEX?s track box (250 kN, 50 Hz) has been recently implemented with a new piezoelectric loading system (±20 kN, 300 Hz) allowing the incorporation of low amplitude high frequency dynamic load time histories to the high amplitude low frequency quasi-static load time histories used so far in the CEDEX?s track box to assess the inelastic long term behavior of ballast under mixed traffic in conventional and high- speed lines. This presentation will discuss the results obtained in the first long-duration test performed at CEDEx?s track box using simultaneously both loading systems, to simulate the pass-by of 6000 freight vehicles (1M of 225 kN axle loads) travelling at a speed of 120 km/h over a line with vertical irregularities corresponding to a medium quality lin3e level. The superstructure of the track tested at full scale consisted of E 60 rails, stiff rail pads (> 450 kN/mm), B90.2 sleepers with USP 0.10 N/mm and a 0.35 m thick ballast layer of ADIF first class. A shear wave velocity of 250 m/s can be assumed for the different layers of the track sub-base. The ballast long-term settlements will be compared with those obtained in a previous long-duration quasi- static test performed in the same track, for the RIVAS [EU co-funded] project, in which no dynamic loads where considered. Also, the results provided by a high diameter cyclic triaxial cell with ballast tested in full size will be commented. Finally, the progress made at CEDEX ?s Geotechnical Laboratory to reproduce numerically the long term behavior of ballast will be discussed.
International
Si
Congress
Ballast: Issues & Challenges (Railway track. Science & Engineering)
960
Place
París (Francia)
Reviewers
Si
ISBN/ISSN
978-0-9565951-9-5
Start Date
05/12/2013
End Date
06/12/2013
From page
32
To page
32
Railways Track Science and Engineering International Workshop Ballast: Issues & Challenges Parí, 5-6 December 2013
Participants
  • Autor: V. Cuéllar (CEDEX)
  • Autor: P. Mira (CEDEX)
  • Autor: Jose Estaire Gepp (UPM)
  • Autor: M. Rodríguez (ADIF, Spain)
  • Autor: A. Pieringer (RailOne, Germany)
  • Autor: R. Garburg (D.B., Germany)
  • Autor: E. Bongini (SNCF, France)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Mecánica de Rocas
  • Departamento: Ingeniería y Morfología del Terreno
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)