Abstract
Ballast materials forming part of railway structures are subjected to cyclic loads. As a result of these loads, ballast densification, aggregate degradation, and lateral spread of the ballast material underneath the ties takes place inducing permanent deformations on the railways. Maintenance and rehabilitation costs of railtracks due to problems related with ballast performance are substantial, and millions of dollars are annually spent around the world in these activities. Understanding the crushable behavior of railtrack ballast could lead to the design of better railways that will reduce these costs. This paper presents the results of two discrete element method simulations intended to study the effect of crushing on the behavior of a simulated track ballast material forming part of a simulated track section. Even though the two simulations consider the same idealized material, crushing was allowed only in one simulation. The simulated track sections were subjected to a cyclic load, and the values of permanent deformation as a function of number of cycles were recorded. The obtained results showed that the induced permanent deformation strongly increased when considering particle crushing even though only a few particles were broken. Moreover, it was found that crushing concentrated underneath the simulated sleepers. Snap shots of the track sections are presented allowing a visualization of the evolution of crushing.
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References
Anderson W.F., Key A.J. (2000). Model testing of two-layer railway track ballast. ASCE J Geotechni Geoenviron Eng 126(4):317–323
Astrom J.A., Herrmann H.J. (1998). Fragmentation of grains in a two-dimensional packing. Eur Phys J B 5:551–554
Boucher D.L., Selig E.T. (1987). Application of petrographic analysis to ballast performance evaluation. Transport Res Rec 1131:15–25
Cheng Y.P., Nakata Y., Bolton M.D. (2003). Discrete element simulation of crushable soil. Geotechnique 53(7):633–641
CP Rail Specification for Ballast: Appendix of the transportation research record, vol.1131, pp.59–63 (1987)
Cundall P.A., Strack O.D.L. (1979). A discrete numerical model for granular assemblies. Geotechnique 29(1):47–65
Harireche O., McDowell G.R. (2003). Discrete element modelling of cyclic loading of crushable aggregates. Granular Matter 5:147–151
Indraratna B., Ionescu D., Christie H.D. (1998). Shear behavior of railway ballast based on large-scale triaxial tests. ASCE J Geotechn Geoenviron Eng 124(5):439–449
Indraratna B., Lackenby J., Christie D. (2005). Effect of confining pressure on the degradation of ballast under cyclic loading. Geotechnique 55(4):325–328
Itasca Consulting Group, Inc.: PFC2D (Particle flow code in two dimensions) version 3.0; sections: theory and background; FISH in PFC, (2002)
Jensen R.P., Plesha M.E., Edil T.B., Bosscher P.J., Kahla N.B. (2001). DEM simulation of particle damage in granular media – structure interfaces. Int J Geomech 1(1):21–39
Klassen M.J., Clifton A.W., Watters B.R. (1987). Track evaluation and ballast performance specifications. Transport Res Rec 1131:35–44
Lim W.L., McDowell G.R. (2005). Discrete element modelling of railway ballast. Granular Matter 7:19–29
Lim W.L., McDowell G.R., Collop A.C. (2004). The application of Weibull statistics to the strength of railway ballast. Granular Matter 6:229–237
Lobo-Guerrero S., Vallejo L.E. (2005a). Crushing a weak granular material: experimental numerical analyses. Geotechnique 55(3):245–249
Lobo-Guerrero S., Vallejo L.E. (2005b). Analysis of crushing of granular material under isotropic and biaxial stress conditions. Soils Foundations 45(4):79–88
Lobo-Guerrero, S., Vallejo, L.E., Vesga, L.F.: Visualization of crushing evolution in granular materials under compression using DEM. ASCE Int J Geomech (in press) (2005)
McDowell G.R., Harireche O. (2002). Discrete element modelling of yielding and normal compression of sand. Geotechnique 52(4):299–304
McDowell G.R., Lim W.L., Collop A.C. (2003). Measuring the strength of railway ballast. Ground Eng 36(1):25–28
McDowell G.R., Buchanan J., Lim W.L. (2004). Performance of ballast mixtures. Ground Eng 37(10):28–31
Raymond G.P. (2000). Track and support rehabilitation for a mine company railroad. Can Geotechn J 37:318–332
Raymond G.P., Bathurst R.J. (1987). Performance of large-scale model single tie-ballast systems. Transport Res Rec 1131:7–14
Selig E.T., Boucher D.L. (1990). Abrasion tests for railroad ballast. Geotechn Test J 13(4):301–311
Suiker A.S.J., de Borst R. (2003). A numerical model for the cyclic deterioration of railway tracks. Int J Numer Meth Eng 57:441–470
Suiker A.S.J., Fleck N.A. (2004). Frictional collapse of granular assemblies. J Appl Mech 71:350–358
Suiker A.S.J., Selig E.T., Frenkel R. (2005). Static and cyclic triaxial testing of ballast and subballast. ASCE J Geotechn Geoenviron Eng 131(6):771–782
Tsoungui O., Vallet D., Charmet J.C. (1999). Numerical model of crushing of grains inside two-dimensional granular materials. Powder Technology 105:190–198
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Lobo-Guerrero, S., Vallejo, L.E. Discrete Element Method Analysis of Railtrack Ballast Degradation during Cyclic Loading. Granular Matter 8, 195–204 (2006). https://doi.org/10.1007/s10035-006-0006-2
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DOI: https://doi.org/10.1007/s10035-006-0006-2