Deformation And Stability Analysis Of The Reinforced Soft Soil Roadbed Under Traffic Loading In Coastal Area

Qingdao is one of the high-speed development cities in the eastern coastal areas.With the development of infrastructure construction, more and more highways, dams,airports and docks are being built on the soft soil foundation. So the stability of thefoundation requirements is improving continually. Because the soft soil have the basiccharacteristics like high water content, low density, low strength, high compressibility,low permeability and moderate sensitivity, the deformation and stability analysis of thesoft soil roadbed under the traffic load has been a universal concern problem in allengineering. It is also a topic that is worthy of further research.First of all, this article introduces the soft soil foundation reinforcement techniqueoften used in our country. It researches the optimal scheme of the foundationreinforcement in Qingdao high-tech zone. And the various physical and mechanicalindexes of the foundation after reinforcement was analyzed in this article. Afterwards,the article introduces the characteristics of the traffic load and the simulationimplementation. And the half-wave sinusoidal load is selected to simulate the trafficload. In the end, the deformation and stability of the soft soil roadbed under the trafficloading is studied by numerical simulation.In this paper, the deformation and stability analysis of the soft soil roadbed underthe traffic load is analyzed by theoretical analysis and numerical simulation, thefollowing results is obtained:(1) Move dead load and harmonic loads were used respectively to simulate thetraffic load. And by simplifying the roadbed for3D model, the transient response of theroadbed under the two loads was analyzed. Eventually, adopt the mobile harmonic loadto simulation the traffic load.(2) The dynamic response of the roadbed under the moving simple harmonic loadby numerical simulation was analyzed. And the change rule of the vertical displacement,acceleration and dynamic stress in the scope of different depth and width of the soilroadbed under the traffic load was obtained.(3) Research the vertical displacement, acceleration and dynamic stress change ruleunder the different driving load different driving speed different roadbed stiffness.The research method and results in the article can be used for the deformation andstability analysis of the soft soil roadbed under the traffic load.