Behavior of Railway Embankment Constructed on Soft Deltaic Deposits under Varying Train Speeds

Abstract:

This study employs 2D finite element modeling using Plaxis to investigate the behavior of the railway embankment constructed on the active Ganges-Bramhaputra floodplain. The parametric study considers three different train speeds, 100, 120, and 170 km/hr, and two different soil profiles along different chainages, chainage 82 km+183 m (Ch1) and 84 km+102 m (Ch2) of Padma Bridge Rail Link. Pseudo-static trainloads have been applied and the settlement of the ballast bottom (BB) and embankment bottom (EB) have been determined and compared along with the factor of safety (FS). From the obtained results, the maximum settlement of EB in Ch1 ranged between 27.45 cm to 29.2 cm which is lower by 9.2 cm from Ch2 on average. For BB, greater settlements have been observed as they varied between 33.25 cm to 36.20 cm for Ch1 and 42.80 cm to 45.31 cm for Ch2. Thus in both cases, Ch2 shows greater settlements. Also in both chainages, the settlements exceed the allowable range. As the train speed increases from 100 to 170 km/hr, the increase in the settlement is noticeable for the ballast bottom but not for the embankment bottom. Considering the FS, the embankments are assessed to be safe in all considered cases with an FS> 1.2, without any significant effect of train speeds.

• Periodical: Advanced Materials Research (Volume 1174)
• Pages: 81-88
• DOI: https://doi.org/10.4028/p-j7627z
• Online since: September 2022
• Authors: Shamontee Aziz*, Joya Rani Mallick, Iram Lamiya Hoque, Md. Arifuzzaman Nayeem, A.F.M. Saiful Amin
• Keywords: Factor of Safety, Railway Embankment, Settlement

References

[1] EIA Report (July 2010). BAN: Padma Multipurpose Bridge Project, Bangladesh Bridge Authority.

[2] Sánchez, M., Wang, D., Briaud, J.L., and Douglas, C. (2014). Typical geomechanical problems associated with railroads on shrink-swell soils. Transportation Geotechnics, 1(4), pp.257-274.

DOI: 10.1016/j.trgeo.2014.07.002

[3] Likitlersuang, S., Pholkainuwatra, P., Chompoorat, T., and Keawsawasvong, S. (2018). Numerical modelling of railway embankments for high-speed train constructed on soft soil. Journal of GeoEngineering, 13(3), pp.149-159.

[4] Madshus, C.C., and Kaynia, A. (2000). High-speed railway lines on soft ground: dynamic behaviour at critical train speed. Journal of Sound and Vibration, 231(3), p.689–701.

DOI: 10.1006/jsvi.1999.2647

[5] Wong, R. C., Thomson, P. R., and Choi, E. S. (2006). In Situ Pore Pressure Responses of Native Peat and Soil under Train Load: A Case Study. Journal of Geotechnical and Geoenvironmental Engineering, 132(10), p.1360–1369.

DOI: 10.1061/(asce)1090-0241(2006)132:10(1360)

[6] American Railway Engineering and Maintenance-of-Way Association (AREMA) (2002). Chapter 1: Roadway and Ballast, Manual for Railway Engineering, USA.

[7] Mestat, P.H., Bourgeois, E., and Riou, Y. (2004). Numerical modelling of embankments and underground works. Computers and Geotechnics, 31(3), pp.227-236.

DOI: 10.1016/j.compgeo.2004.01.003

[8] Zeng, S.G. (1997). Railway Granular Ballast, China Railway Press (in Chinese).

[9] Sawangsuriya, A., Wachiraporn, S., and Sramoon, W. (2008). Assessment of Modulus and CBR of Pavement Materials for Design and Construction, Seminar of Bureau of Materials, Department of Highways, 31-50.

[10] Brinkgreve, R.B.J., Engin, E., and Swolfs, W.M. (2012). Plaxis User's Manual, Plaxis BV, Netherlands.

[11] Wang, C., Zhou, S., Guo, P., and Wang, B. (2014). Experimental analysis on settlement controlling of geogrid-reinforced pile-supported embankments on collapsible loess in high-speed railway. International Journal of Pavement Engineering, 15(9), pp.867-878.

DOI: 10.1080/10298436.2014.943130

[12] Aziz, S., and Islam, M.S. (2022). Mechanical Effect of Vetiver Grass Root for Stabilization of Natural and Terraced Hill Slope. Geotechnical and Geological Engineering, pp.1-20.

DOI: 10.1007/s10706-022-02092-y