Study On Dynamic Response Characteristics Of Pipes Under The Coupling Of Vehicle-Road-Soil

Along with the continuous expansion of the city scale and the growing demand for industrial and agricultural production,more and more pipelines are directly buried under the road or covered by extended roads.The vehicle load is caused by the unevenness of the pavement.The vehicle load acts on the buried pipeline through the pavement and the soil,causing serious deformation and damage of the pipeline.It has a great impact on the normal use and safe operation of buried pipelines.In this paper,the vehicle,pavement,soil and pipeline are regarded as a whole dynamic system.For the steel pipeline buried under the typical asphalt concrete pavement in the urban area,the finite element analysis model of road-tube-soil system was established by using finite element analysis software ABAQUS,which take full account of the structure of asphalt concrete pavement system,the soil elastic-plastic and viscosity,the pipeline elastic-plastic and pipe-soil contact characteristics.The combination of finite element and infinite element is used to build the model.The boundary effect problem is discussed.The application method of multiple random loads of vehicles is discussed.The finite element analysis model of the road-tube-soil system under the vehicle-road-soil coupling is established.The dynamic response of horizontal and longitudinal buried pipeline is analyzed.The response characteristics of the equivalent stress of buried pipelines when different vehicle speeds,different vehicle loads and different pipeline depths are discussed.The mechanism of multi-wheel random dynamic load passing through the road-soil-to-pipe is revealed.The research results in this paper provide an effective method for finite element modeling of road-tube-soil system under vehicle load,and have important reference value for further research on fatigue damage of buried pipelines.