Abstract
Land settlement produced by groundwater exploitation may cause larger deformation of the high-speed subgrade. To meet the settlement control requirements after construction of the high standard of high-speed railway subgrade, Pile-Slab composite foundation treatment technology keeps developing and applying in high-speed railway construction. However, the settlement deformation calculation theory of Pile-Slab composite foundation is not mature, in particular, 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 highspeed railway on Pile-Slab composite foundation deformation, in this paper, we establish 3D fluid-solid coupling model using ABAQUS, analyze the effect of different groundwater exploiting quantities on high-speed railway subgrade when CFG piles are used to strengthen the foundation, and compare to the result with no CFG piles. The analysis shows that in the condition of pumping water, CFG Pile-Slab composite foundation has a significant effect on decreasing subgrade lateral deformation and settlement which are reduced by 70%.
Highlights
Over exploitation of groundwater is the main cause of land settlement
According to CFG piles foundation reinforcement engineering example in Jing-Hu high-speed railway and pumping groundwater actual conditions near railway, 3D fluid-solid coupling model is established, and comparison for the calculation results can be seen in the figures
Comparing using CFG piles to nonpiles, we can find that the lateral displacement presents a significant decline by 70%, for example, in the condition of pumping yield 750m3/d, the largest lateral displacement is Groundwater Exploitation on High-Speed Railway Pile-Slab Structure Subgrade
Summary
Over exploitation of groundwater is the main cause of land settlement. At present, land settlement in more than half of the provinces in China is caused by excess exploitation of groundwater, among them, more than fifty cities are faced with serious settlement, north china plain where Beijing is located has been the largest groundwater funnel area in the world [1]. To satisfy the requirements of foundation strength, deformation and seismic behavior, especially for meeting the settlement control requirements after construction of the high standard of high-speed railway subgrade, Pile-Slab composite foundation treatment technology keeps developing and applying in high-speed railway construction [6, 7]. Because the technology of Pile-Slab composite foundation is complicated, the settlement deformation calculation theory of Pile-Slab composite foundation is not mature, in particular, the research for PileSlab composite foundation deformation caused by groundwater exploitation is seldom, which are far behind the requirements of engineering practice. We establish 3D fluid-solid coupling model using ABAQUS, analyze the effect of different groundwater exploiting quantities on high-speed railway subgrade when CFG piles are used to strengthen the foundation, compare to the result with no CFG piles, and provide theory guidance for high-speed railway construction and operation maintenance
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