Study on Shakedown Behavior of Subgrade Red Clay under Cyclic Loading

This paper describes the shakedown, hysteretic and plastic behavior of cohesive subgrade soil under cyclic loading. Based on the energy dissipation principle, the various mechanic behaviors of subgrade red clay are discussed by repeated loading test. The test was performed in various conditions of subgrade soil. Different moisture content, stress level, the number of repeated loading and stress path are taken into account during the test. According to the test results, the factors that contribute to various mechanic behaviors of subgrade soil are analyzed in detail. In addition, the study presents a discussion on stress-strain relation and plastic deformation model of subgrade red clay with deforma- tion principle. The mechanism of permanent deformation is explained in light of shakedown and hysteretic behavior.