Abstract:In the process of urban road construction, various geological conditions are usually encountered; soft soil foundation is one of the common geological problems. The subgrade of urban road is the foundation of pavement and should meet the requirements of strength, deformation and stability. Because soft soil has the characteristics of large natural water content, high compressibility, low bearing capacity and low shear strength, when soft soil is used as subgrade foundation, Various foundation reinforcement measures should be taken to treat the soft soil foundation to make the urban road meet the design requirements. Taking dangxiao Road (Dongliu road Fuxiang Road) in Changsha Economic Development Zone as an example, this paper establishes the corresponding numerical simulation with ABAQUS for the working condition of using geogrid and cement mixing pile to strengthen the soft soil to form a composite foundation, According to the situation of no reinforcement measures and composite reinforcement of Geogrid and cement mixing pile, the law of reinforcement performance of composite foundation is analyzed based on three indexes: vertical settlement, horizontal displacement and vertical stress. The research conclusion plays a good guiding role in soft soil foundation treatment of urban road construction.
