Land settlement produced by groundwater exploitation may cause larger deformation of the high-speedsubgrade. To meet the settlement control requirements after construction of the high standard of high-speed railwaysubgrade, Pile-Slab composite foundation treatment technology keeps developing and applying in high-speed railwayconstruction. However, the settlement deformation calculation theory of Pile-Slab composite foundation is not mature, inparticular, the research for Pile-Slab composite foundation deformation caused by groundwater exploitation is seldom,which is far behind the requirements of engineering practice. To study the effect of exploiting groundwater near the highspeedrailway on Pile-Slab composite foundation deformation, in this paper, we establish 3D fluid-solid coupling modelusing ABAQUS, analyze the effect of different groundwater exploiting quantities on high-speed railway subgrade whenCFG piles are used to strengthen the foundation, and compare to the result with no CFG piles. The analysis shows that inthe condition of pumping water, CFG Pile-Slab composite foundation has a significant effect on decreasing subgradelateral deformation and settlement which are reduced by 70%.
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