Three-Stage Permanent Deformation Behavior of Subgrade Soils
The development of the permanent deformation of subgrade soils under repeated load tests may consists of three stages, namely the primary, secondary and tertiary stages, but the existing models can not describe this behavior very well, so a new model is required to be developed. Based on the creep equation of the soil under static load, a mechanistic model is developed to describe the development of the permanent deformation of the soil under repeated load tests. Triaxial repeated load tests are conducted for silty soils and results show that, under some conditions, the development of the permanent deformation of silty clay consists of three stages and the number of load repetitions corresponding to the initiation of the tertiary stage is 330,0000. The new model is used to fit the test results and the comparison of test results and fitting results prove that this model can describe all three stages of permanent deformation.
Hui Li, Yan Feng Liu, Ming Guo, Rui Zhang and Jing Du
R. Fang et al., "Three-Stage Permanent Deformation Behavior of Subgrade Soils", Advanced Materials Research, Vols. 374-377, pp. 1942-1946, 2012