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This paper provides an insight into the impact of water content and aging on shear strength and cyclic plastic deformation of ballast. The ballast layer is designed as a free draining layer, but aging and generation of fines severely affect its deformation behavior and shear strength. To gain a better understanding of the shear strength characteristics, a series of monotonic loading triaxial compression tests were conducted on the aged ballast. The finding indicated that, with aging the shear strength of the ballast decreases. Moreover, it was also observed that the increase in water content negatively affects the shear behavior of the ballast. In order to comprehend the cyclic plastic deformation of the aged ballast, a series of cyclic loading triaxial compression tests were performed. The results revealed that the permanent deformation of ballast was significantly affected by both aging and water content. Thus, to understand the deformation behavior of ballast it is important to evaluate the synergistic effect of aging and water content. Furthermore, the applicability of the University of Illinois at Urbana-Champaign model (UIUC model) was evaluated to predict the cyclic plastic deformation of the aged ballast.

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A Simple Prediction Method for Cyclic Plastic Deformation of Aged Ballast in Consideration of Water Content Variation

  • 会议论文

  • 发表日期：

    2025年

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  • Abhay Kumar,
  • Tatsuya Ishikawa,
  • Namit Jain,
  • Erol Tutumluer

摘要

This paper provides an insight into the impact of water content and aging on shear strength and cyclic plastic deformation of ballast. The ballast layer is designed as a free draining layer, but aging and generation of fines severely affect its deformation behavior and shear strength. To gain a better understanding of the shear strength characteristics, a series of monotonic loading triaxial compression tests were conducted on the aged ballast. The finding indicated that, with aging the shear strength of the ballast decreases. Moreover, it was also observed that the increase in water content negatively affects the shear behavior of the ballast. In order to comprehend the cyclic plastic deformation of the aged ballast, a series of cyclic loading triaxial compression tests were performed. The results revealed that the permanent deformation of ballast was significantly affected by both aging and water content. Thus, to understand the deformation behavior of ballast it is important to evaluate the synergistic effect of aging and water content. Furthermore, the applicability of the University of Illinois at Urbana-Champaign model (UIUC model) was evaluated to predict the cyclic plastic deformation of the aged ballast.