Abstract：Research purposes: As the embankment of the Yingkou Station of Harbin － Dalian High － speed Railway is situated on the base of the littoral precipitation facies with thickness of 55m，there is no hard soil bedding as the supporting bedding to the CFG pile． The bearing characteristics of the foundation and deformation characteristics are not good for construction of the high － speed railway． In order to ensure the subgrade settlement meets the the code requirement，the new composite structure of CFG pile ( long pile) ，MIP pile ( short pile) ，bedding and reinforced concrete was used for the first time to reinforce the foundation of Harbin － Daling High － speed Railway． The measurement and analysis of the bearing situation and settlement deformation of this composite structure were made．
Research conclusions: In this new composite foundation，the CFG piles bears the most loads of the soiling filling of subgrade，the MIP pile bears some loads of the soil filling of the subgrade and the soil between piles bears a little load of the soil filling of the subgrade． They bear the load together and it satisfy the bearing capacity of the subgrade and fit to the design concept of the composite foundation． This new composite structure can control the total settlement and uneven settlement while make the rapid completion of the foundation settlement to ensure that the post － construction settlement can meet the code requirement and the track stability of high － speed railway is good during the operation． The research result is of the great significance and reference to the design and construction soft soil foundation．
张先军，赵世运. 哈大高速铁路新营口车站组合桩复合地基的应用研究[J]. 铁道工程学报, 2011, 28(5): 34-39.
Zhang Xianjun Zhao Shiyun. Reseach on Application of Composite Foundation of Composite Pile for New Yingkou Station of Harbin － Dalian High － speed Railway. 铁道工程学报, 2011, 28(5): 34-39.
Chang Hao． Research on the Application of Long Spiral Pump Pressure CFG Pile in Reinforcing Soft Soil Subgrade of Passenger Dedicated Line［J］． Journal of Railway Engineering Society，2010( 1) : 29 － 32．
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［3］ 张耀东，王晓东． CM 长短桩复合地基的设计与应用［J］．铁道建筑技术，2002( 2) : 41 －44．
Zhang Yaodong， Wang Xiaodong． Design and Application of CM Pile Composite Foundation ［J］． Railway Constrution Technology，2002( 2) : 41 － 44．
Wang Xianzhi，Ou Jianhua，Zheng Junjie． Application of Multi － element Composite Foundation Formed by CFG and Cement － soil Piles ［J］． Rock and Soil Mechanics，2002( 10) : 117 － 119．
Zhao Minghua，Zhang Ling，Yang Minghui． Settlement Calculation of the Long － short － pile Composite Foundation with Shear Displacement Method ［J］． Chinese Journal of Geotechnical Engineering，2005( 9) : 994 － 998．
China Academy of Railway Sciences． The Evaluation Technical Guidelines for Laying Continuously of Passenger Special Line Ballastless Slab ［K］． Beijing: China Railway Publishing House，2009．
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2011, Vol. 28 
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