The Theoretic And Experimental Studies On The Highway Circular Culvert Under The Vibratory Roller's Action

In this thesis, the following contents about the response of the circular culvert, which is buried in the highway and under the action of vibratory roller, have been studied. The main contents are as follows:1. Through describing the vibrator's working principles, the vibratory function is demonstrated. Also dose the distinction between vibratory roller and static one.2. Lot kinds of models about the vibratory roller-soil are analyzed considering the roller design. Among them, the Tai-SungYoo' model is adopted ordinarily as the standard one in vibratory roller's design. According to the model, the dynamic differential equations are established. With the application of software MatLab, the solutions of the equations are achieved, then the dynamic load which roller applies to the soil is determined.3. By corresponding assumptions, another dynamic load is presented by this thesis. The load's numerical value equals to the sum of vertical centrifugal force and the weight supported by the front drum. Using it the calculation in the chapter back indicates the load is in accord with the actual conditions.4. In the field test, the response of the culvert under the action of vibratory roller and different soil height are measured. It is found with the rise of the soil height the response of the culvert becomes weaker and weaker.5. Considering the interaction of soil and structure, the soil is taken as part of the whole 3D model with culvert. The FEM analysis of the whole model has been completed by using the analytic software-ANSYS. The rationality of the whole model is confirmed by the result comparison of calculate conclusion and field test.6. The expression of the strain on top culvert is achieved through regression analysis and the comparison of different soil heights and load grades in the culvert axis-upright direction. Based on the expression, the critical soil heights under the combination of different load gradesand roller's weights are achieved.7. Corresponding with the vibratory action, the static analysis is processed, and the impact factor is got through the comparison of the two calculated conclusion. The same time, the impact factors given by the corresponding codes are smaller comparatively. The factor presented in the thesis is recommended.