Abstract：Research purposes: Control of post construction settlement under poor geological condition is the key issue in high - speed railway design. The greater post construction settlement will have bad effects on the operation of high - speed railway. Using finite element method (FEM)，this paper studies on the CFG pile composite foundation treatment of the soft soil subgrade settlement properties of the high - speed，as an example of Wuhan comprehensive test section of Wuhan - Guangzhou high - speed railway.
Research conclusions ： The result shows that ： ( 1 ) The settlement amount gradually increases with the enhancing of height of the embankment. The settlement amount of composite foundation of CFG pile end decreases with the increasing of distance from the center of embankment，and rapidly decays in the outside of the top width of the subgrade. (2) The stress ratio between CFG pile and soil decreases with the increasing of the height of embankment，the load is becoming more uniform of CFG pile and soil. The stress ratio of CFG pile and soil increases with the distance from the center of embankment，embankment centers force of piles and soil are more uniform. (3) Subgrade pore water pressure increases rapidly accompanied with the increase of embankment height， and begins to dissipate after completion of loading
process. A year after the subgrade construction，embankment center pore water pressure almost spreads evenly,and its number is about 38 kPa. (4) The research result can provide a reference for the settlement control of soft soil composite foundation of high - speed railway.
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ZHANG Feng, LIU Ying, XU Zhao -yi, LI Zhi -yi. Research on the Settlement of Soft Soil Composite Foundation for Wuhan Experimental Section of Wuhan - Guangzhou High - speed Railway. Journal of Railway Engineering Society, 2015, 32(9): 30-34.
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2015, Vol. 32 
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