Research On Influence Of Static Pressure Pile Construction For Adjacent High-speed Railway Subgrade And Bridge

There are more and more founfation reinforcement of soft soil to the nearby exsiting railway, one of the common ways of foundation reforcement is the application of static pressure pile, however, the soil squeezing effect will cause negative impact on the nearby exsiting railway. The research on influence of static pressure pile construction for adjacent high-speed railway subgrade and bridge is carried out in this paper including the following concrete content:(1) The mechanism and theory of cavity expansion were systematic exposited, and the effect of single pile’ssoil squeezing was calculated according to the formulation of cavity expansion theory.(2) A three-dimensional simulation analysis was made to research soil squeezing effect of pile group by Abaqus, and the differences of soil squeezing effect under different pressing pile order was discusseded.(3) Combined with the actual project, static pressure pile construction’s effect on existing line subgrade and bridge was simulated by the application of the finite element method, and its role in law was analyzed.(4) The function of stress release holes to prevent extrusion was studied by FEM, the results show that:the stress release holes can reduce the displacement and stress caused by the soil squeezing, and the reducement of stress is moret obvious.(5) The measures to reduce the effect on existing line were discussed, and the static pressure pile construction monitoring methods were suggested emphatically.