Geotechnical auscultation of a French conventional railway track-bed for maintenance purposes
| Autor: | Yu-Jun Cui, Francisco Lamas-Lopez, Nicolas Calon, S. Costa D׳Aguiar |
|---|---|
| Přispěvatelé: | Laboratoire Navier (navier umr 8205), École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), SNCF, SNCF : Innovation & Recherche |
| Rok vydání: | 2016 |
| Předmět: |
Ballast
Engineering medicine.diagnostic_test business.industry 0211 other engineering and technologies Stiffness Modulus 020101 civil engineering 02 engineering and technology Structural engineering Subgrade Auscultation Track (rail transport) Geotechnical Engineering and Engineering Geology Penetration test 0201 civil engineering [SPI]Engineering Sciences [physics] medicine Geotechnical engineering medicine.symptom business Elastic modulus 021101 geological & geomatics engineering Civil and Structural Engineering |
| Zdroj: | Soils and Foundations Soils and Foundations, Japanese Geotechnical Society, 2016, 56 (2), pp.240-250. ⟨10.1016/j.sandf.2016.02.007⟩ |
| ISSN: | 0038-0806 |
| DOI: | 10.1016/j.sandf.2016.02.007 |
| Popis: | International audience; Prior to renewal or maintenance works on a railway track it is required to perform a proper investigation of the stiffness thickness of each material constituting the track-bed. In practice, different techniques are used for this purpose. In this study, a comparison of two methods of determining the stiffness of track-bed materials (dynamic penetration dynamic plate load) is made for a representative French conventional railway line, aiming at optimising the use of different geotechnical auscultation techniques for the railway applications. Firstly, results from geo-endoscopic tests are analysed to define the thickness nature of the different materials found in the track. Then, dynamic penetration tests (PANDA tests) are performed to evaluate the stiffness of the different layers. Statistical distribution of soil stiffness is analysed for each layer. In addition, the elastic moduli of different materials are estimated from their stiffness using empirical equations. Secondly, dynamic plate load tests using a light weight deflectometer device (LWD) are carried out on surfaces (on tracks service paths) in order to estimate the dynamic static moduli of ballast subgrade. A statistical analysis of the obtained results shows a low dispersion rate a satisfactory repeatability. The static moduli estimated from LWD tests are found to be consistent with the elastic modulus estimated from PANDA tests, showing that different auscultation methods give complementary information about the mechanical properties of the materials constituting the conventional tracks. (C) 2016 The Japanese Geotechnical Society. Production hosting by Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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