Abstract
The increasing excess pore pressure under rail tracks especially in coastal soft soil regions has been indicated as one of the major reasons causing numerous track issues such as mud pumping. When the excess pore pressure develops to a certain degree, it causes considerable increase in hydraulic gradient associated with hydraulic forces over the soil depth that results in upward migration of fines, i.e., mud pumping followed by severe loss of soil mass and excessive deformation of soil matrix. This issue is simulated in this paper by using the computational fluid dynamics (CFD) coupled with the discrete element method (DEM). Subgrade soil is built in DEM with respect to realistic soil profiles while an increasing hydraulic gradient is generated to model upward fluid flows in CFD. The study indicates soil fluidization develops from localized scale via soil piping to overall scale where all particles become suspended and migrate upwards (i.e., heave formation). The overall fluidization results in a severe degradation in the contact network of soil particles (i.e., soil fabric) and effective stress. The study also shows reasonable predictions of the CFD-DEM coupling on the hydraulic response of subgrade soils.
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References
Duong, T.V., Cui, Y.-J., Tang, A.M., Dupla, J.-C., Canou, J., Calon, N., Robinet, A.: Investigating the mud pumping and interlayer creation phenomena in railway sub-structure. Eng. Geol. 171, 45–58 (2014). https://doi.org/10.1016/j.enggeo.2013.12.016
Hudson, A., Watson, G., Le Pen, L., Powrie, W.: Remediation of mud pumping on a ballasted railway track. Procedia Eng. 143, 1043–1050 (2016). https://doi.org/10.1016/j.proeng.2016.06.103
Indraratna, B., Singh, M., Nguyen, T.T., Leroueil, S., Abeywickrama, A., Kelly, R., Neville, T.: A laboratory investigation on fluidization of subgrade under cyclic train loading. Can. Geotech. J. (2020). https://doi.org/10.1139/cgj-2019-0350
Kloss, C., Goniva, C., Hager, A., Amberger, S., Pirker, S.: Models, algorithms and validation for opensource dem and cfdem. Progress Comput. Fluid Dyn. Int. J. 12(2), 140–152 (2012)
Kuo, C., Hsu, C., Wu, C., Liu, P., Chen, D.: Study on the piping path and mechanism of mud pumping in railway subgrade. In: Proceedings of the 19th International Conference on Soil Mechanics and Geotechnical Engineering (ISSMGE), Seoul, pp. 1051–1054 (2017)
Nguyen, T.T., Indraratna, B.: Experimental and numerical investigations into hydraulic behaviour of coir fibre drain. Can. Geotech. J. 54(1), 75–87 (2017). https://doi.org/10.1139/cgj-2016-0182
Nguyen, T.T., Indraratna, B.: A coupled CFD-DEM approach to examine the hydraulic critical state of soil under increasing hydraulic gradient. ASCE Int. J. Geomech. 20(9), 04020138–1:15 (2020a). https://doi.org/https://doi.org/10.1061/(ASCE)GM.1943-5622.0001782.
Nguyen, T.T., Indraratna, B.: The energy transformation of internal erosion based on fluid-particle coupling. Comput. Geotech. 121, 103475 (2020). https://doi.org/10.1016/j.compgeo.2020.103475
Nguyen, T.T., Indraratna, B., Kelly, R., Phan, N.M., Haryono, F.: Mud pumping under railtracks: Mechanisms. Assessments and Solutions. Australian Geomech. J. 54(4), 59–80 (2019)
Skempton, A.W., Brogan, J.M.: Experiments on piping in sandy gravels. Geotechnique 44(3), 449–460 (1994)
Trani, L.D.O., Indraratna, B.: Assessment of subballast filtration under cyclic loading. J. Geotech. Geoenviron. Eng. 136(11), 1519–1528 (2010)
Zhao, J., Shan, T.: Coupled CFD–DEM simulation of fluid–particle interaction in geomechanics. Powder Technol. 239, 248–258 (2013). https://doi.org/10.1016/j.powtec.2013.02.003
Acknowledgements
This research was supported by the Australian Research Council (LP160101254) and ARC ITTC-rail centre. The financial and technical support from SMEC, Coffey, Sydney Trains and ARTC (Australian Rail Track Corporation) is much appreciated.
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Nguyen, T.T., Indraratna, B. (2021). Fluidization of Subgrade Soil Under Rail Tracks Through CFD-DEM Coupling. In: Barla, M., Di Donna, A., Sterpi, D. (eds) Challenges and Innovations in Geomechanics. IACMAG 2021. Lecture Notes in Civil Engineering, vol 126. Springer, Cham. https://doi.org/10.1007/978-3-030-64518-2_33
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