| With the rapid development of the highway,the design of high embankment disadvantage is more and more obvious,high cost,construction difficulty,long cycle and post-construction settlement is big,therefore,people gradually adopt the low embankment design concept instead of the highway high embankment.Low embankment design reduces the weight of the structure,reduce land occupied,but the reduction of filling height may cause the scope of vehicle load into the foundation soil,especially in the coastal soft soil area,is more remarkable.So it is very important to analyze the problems in the design of low embankment on soft ground.In this paper,the Road Surface Roughness and the cause of dynamic load are introduced.Dynamic load coefficient and sine wave road function are derived by using a quarter vehicle vibration model.The relationship curve between the dynamic load coefficient and the pavement wavelength,the road surface amplitude,speed and load is presented.Combining with the project of Tianjin coastal new-region west outer ring,the stress and deformation of Subgrade under different conditions are analyzed.Secondly,the asphalt pavement is simulated by elastic multi-layer system.The pavement structure was established based on ANSYS,three dimensional finite element model,combining with the actual data,the deformation and the stress of the soft soil foundation caused by heavy load vehicles are analyzed,and the influencing factors are analyzed.The influence of different axle load,embankment height,driving speed and other factors influence on the low embankment of the coastal soft soil area is analyzed,subgrade settlement curves are obtained.Finally,the influence of vehicle load and its dynamic load on the depth of the subgrade work area is analyzed,and the engineering measures are suggested to reduce the deformation of low embankment on soft soil foundation,which provides a beneficial reference for the design and construction of low embankment in soft soil area. |
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