Dynamic Response Analysis Of Asphalt Pavement In Stress-Seepage-Temperature United Field

For the asphalt pavement too much weight and travel over the material can damage it, beyond that changing temperature and high pore water are also important factors of destruction. Temperature itself not only affects the performance of pavement structure material.And the periodic changes of it in pavement produce repeated tension and compression stress, making pavement structure layer produce fatigue failure. Pore water due to the vehicle loads can form high pore water which will continuous scours internal material.Long-term effects can make the bonding material gradually from aggregate surface, leading to the loss of cohesive force between them,and finally result to such phenomenon as pavement appear loose, potholes and other forms failure. In order to explore the deep reasons of the pavement destruction, it is necessary to carry out dynamic response research under the joint action of pore water stress and temperature.By using the finite element software ABAQUS, the paper first establish models of separately stress field, temperature field and seepage field of the pavement structure.then it extract each limit state unit stress of temperature and seepage as initial stress of the joint action of pavement structure response, finally it input the initial stress data to stress field model, conducting the joint action simulation of three fields. It analysis vertical stress, transverse stress, shear stress and its strain during different structure layer. At last it compared the consequence with the separate action of stress field.Research shows that under the separate action of stress, The stress and strain of the road has the characteristics of volatility and instantaneity.The stress increases a certain extent with the increase of depth of the different structural layers. Due to joint action of moisture and temperature, the upper and middle layer has more influence compared with single stress. Because of far distance between road table and subbase, stress function change is not obvious compared with the separate effect due to smaller temperature stress and seepage action. At last, it set up test road to verify simulation results. Through contrast of all sorts of actual monitoring data and the simulation results, the results show that the simulation and actual pavement response has the same rule. Analog data can accurately reflect the actual conditions of pavement response, thus illustrating the rationality of the model.