Investigation on the effects of physical property and stress state of graded crushed stone on resilient modulus and permanent deformation

The graded crushed stone has been widely used in flexible pavement structures to reduce the reflective crack and optimize pavement performance. The most important performance indexes are the mechanical property characterized by resilient modulus and permanent deformation. This paper is aimed to study the effects of the physical property and stress state on the performance of graded crushed stone to provide the basis of the pavement design. The results show that: the fine gradation has a higher increasing magnitude as the bulk stress increases, indicating a more significant stress dependence, while the coarse and middle gradations have a similar changing trend. The increase in water content could reduce the resilient modulus and enhance permanent deformation due to the lubricating effect. The deviatoric stress has a prominent effect on the resilient modulus for coarse gradation, while the confining stress is for fine gradation. Then the permanent deformation is significantly affected by the stress ratio, in which accumulated permanent strain and deformation rate all increase with the increasing of stress ratio. The critical stress ratio should be determined to control the stress state of graded crushed stone to a limited range to prevent unstable failure.

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  • English

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  • Accession Number: 01891449
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 28 2023 9:34AM