软基沥青路面公路的超载损伤机理及预防

o find out the characteristics of overloaded freight, an axle load survey on the representative highways in the delta of Yangtze River is made. On the basis of its result, the design process of heavy duty pavement is discussed. Considered the road overload situation, we carry on the modeling computation to the highway pavement structure by using finite element software. A two-degree of freedom vehicle dynamic model is deduced. The virtual excitation method and the high precision direct integration scheme are employed to calculate the vehicle dynamic load acting on road under pavement roughness. This paper briefly introduces the theory of the ground-penetrating radar method, discusses the application of the geological radar in the detection of the highway disease and finally analyzes the cause of the geological disaster formation. Through analysis of early failure of highway at the delta of Yangtze River, based on the observation result with axle load testing equipment, the influence of vehicle overload on pavement design is analyzed and the design parameters applicable for heavy traffic are educed. By analyzing the character of overloaded vehicles, a suitable contact model between overloaded freight and asphalt pavement was established.