关键词: 道路工程, 半刚性基层, 有限元分析, 温度场, 温度应力

Abstract: Based on the semi-rigid base asphalt pavement with serious transverse crack in Gansu province, the temperature field and temperature stress of semi-rigid base asphalt pavement in this area were analyzed. With the help of ANSYS finite element software, the three-dimensional finite element model of semi-rigid asphalt pavement structure in Gansu was established and the heat loadings, such as the temperature and solar radiation, were applied. The variation rule of temperature field and temperature stress of semi-rigid asphalt pavement in Gansu was obtained by the solution, which provided some referential opinions to the designation of semi-rigid base asphalt pavement structure in Gansu. The results show that the change of the asphalt layer thickness has a great influence on the temperature stress and temperature field; the difference of temperature between the top and bottom of asphalt layer is increased with the increase of asphalt layer thickness, while the gradient of temperature distribution in the asphalt layer decreases with the increase of asphalt layer thickness; the asphalt surface layer is thicker, the faster the temperature stress of the upper half of asphalt layer diffuses, and the more slowly the temperature stress of the bottom half of asphalt layer diffuses.

Key words: highway engineering, semi-rigid basement, the finite element analysis, temperature field, temperature stress