Abstract：Research purposes: Pile － slab structure as a new － type railway foundation of track undersurface can control its subgrade settlement effectively and has been widely applied in high speed railway construction． It is very likely that welded turnout is lie upon the Pile － slab structure that is increaseing used in high speed railway． To research the interaction between welded turnout and Pile － slab structure，this paper，with building the mode of welded turnout in pile － slab structure，mainly analyze the influence factors to subgrade settlement for different pile spacing，plates with different soil properties and different position． Research conclusions: The results show that: ( 1) the excessive pile spacing will be unfavorable to the mechanical behavior of the upper welded turnout． ( 2) without considering elastic supporting action of the soil under the plates，The underpants of pile － slab structure can also offer enough vertical stiffness to Welded turnout structure ． ( 3) Subgrade settlement will affect the basic Rail buckling force，especially between two adjacent pile － slab structure，but have little influence on others．
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Wang Ping，Liu Xueyi． Calculation Theory and Design Method of Welded Turnout［M］． Chengdu: Soutwest Jiaotong University Press，2007．
Zhan Yongxiang， Jiang Guanlu， Niu Guohui， Guo Jianhu． Theoretical Exploration on Design of Pile － plate Structure Subgrade in Steep Slope Section of High Side Slope on Wuchang － Guangzhou Railway Passenger Dedicated Line ［J］． Journal of Railway Engineering Society，2007( S) : 94 － 96．
2011, Vol. 28 
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