Finite Element Analysis Of The Compaction Quality About The Small Vibratoy Compactor

In order to the stress distribution regularities of soil under vibratory-drum, The three-dimensional finite element model for vibrating compaction had been developed and it is analyzed how vibration frequency, vibration amplitude and rolling speed affects the stress distribution.The thesis analysed the intensity characteristic and the stress-strain relationship of graded soil by making direct shear test and dynamic triaxial test. The results shows that the higher water content is, the lower Cohesive force and Internal friction angle is. However, the higher dry density is, the higher Cohesive force and Internal friction angle is. Consolidation stress, dry density and water content had a great effect on the relationship with dynamic stress and dynamic strain of graded soil when the graded soil was applied to vibrating load. Especially, dynamic stress had the linear relation with dynamic strain when the consolidation stress is low.The three-dimensional finite element model for vibrating compaction had been developed for the nonlinearity of soil, the geometric nonlinearity due to large deformation, the nonlinear contact boundary conditions between vibratory drum and soil. The thesis analyzed the distribution regularities and attenuation characteristic of stress-strain of soil, when vibration frequency, vibration amplitude and rolling speed were changed. The results indicated that vibration amplitude and the compactness state is the very important factors to affect the stress distribution regularities of soil. It was obvious to increase the stress by augmenting the vibration amplitude. The rolling speed has a great effects on the stress of the surface soil.During the construction of roadbed, it was helpful to increase the compaction efficiency by improving the rolling velocity with the compaction pass.