Abstract: The application of the glass fiber reinforced plastics mortar pipe in highway culvert becomes more and more extensive. However, due to the lack of micro-mechanical analysis of the pipeline, the application of the pipe in highway culvert engineering lacks some corresponding standards and basis. In this paper, the numerical simulation software ABAQUS was used to establish the model of surface-pipe-soil. Then, the deformation of the pipe and the stress of the bottom layer of the pavement under different conditions were analyzed. Through optimizing the thickness of the pipe wall, the optimal diameter ratio range of the pipe is obtained under the stress of the bottom layer at the critical splitting strength in different condition. Under the safety of the pavement and pipe structure, it provides some reliable analysis basis for minimizing the cost of project.

Key words: glass fiber reinforced plastic, vehicle load, bottom tensile stress at the bases level, optimum diameter ratio