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Permanent deformation characteristics of coarse-grained subgrade soil under train load

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Document pages: 15 pages

Abstract: This paper presents the results of a laboratory test to describe the permanent deformation characteristics of coarse-grained soil. In order to evaluate the effects of cyclic stress amplitude, initial average stress and initial stress ratio on permanent axial deformation, six series of repeated load triaxial tests were carried out. The results show that the permanent deformation of coarse-grained soil increases with the increase of cyclic stress amplitude. Especially, for the relatively low cyclic stress level, the cumulative rate of permanent deformation gradually decreases with the increase of the number of cycles, and finally reaches the equilibrium state. The initial stress ratio also significantly promotes the formation of axial deformation because it means higher deviatoric stressn pressure kept constant. As the initial stress ratio was less than the slope of static failure line, the experimental results indicated that the increase of initial mean stress enhanced the capability of resisting deformation. A simplified mechanistic empirical prediction model was proposed, which predicted the permanent deformation as product of four independent functions about cyclic stress amplitude, initial mean stress, initial stress ratio, and number of load cycles. Satisfactory predictions of the permanent deformation behavior of coarse grained soils were obtained with the proposed model.

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