Prediction of Extra Confinement Offered by Cellular Inclusion Under Three-Dimensional Stress State

Springer International Publishing
Publication Type:
Challenges and Innovations in Geomechanics, 2021, 126, pp. 850-858
Issue Date:
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The granular substructure layers in a ballasted railway track often undergo a large amount of lateral deformation due to insufficient confinement. This deformation results in a loss of track geometry and demands expensive maintenance work to ensure passenger safety and comfort. The cellular inclusions such as scrap tires and geocells can provide confinement to the granular substructure layers and increase their strength and stiffness. It is inevitable to evaluate the magnitude of improvement in strength and stiffness provided by these inclusions before their in-situ application. This article presents a mathematical model to determine the magnitude of extra confining pressure offered by the inclusions under the three-dimensional stress state. The model is validated by comparison with the results of experimental investigations on the cellular inclusion reinforced soils. The parametric study of the variables affecting the performance of cellular inclusions reveals that the magnitude of additional confinement significantly depends on the stress state, inclusion and infill soil properties. The present model can be employed for the selection of optimum material parameters for achieving the desired magnitude of confinement from the cellular inclusions.
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