Abstract：Research purposes: The design method for the rigid composite foundation is commonly used for the rigid composite foundation under embankment and the design result is big different from the actual situation． It brings about the high cost of the rigid pile composite foundation to cause the impact on the wide application of the rigid pile composite foundation． In order to better application of the rigid pile in the composite to enhance the bearing capacity of the embankment and bring the good bearing capacity of the rigid pile into play，the experimental research is done in large －scale on the design method for the rigid pile composite foundation under embankment．
Research conclusions: The research shows the design method for the rigid pile composite foundation under embankment should follow the two basic principles: one is to bring the rigid pile into the major play and the other is to bring the good bearing capacity of the rigid pile into play． In order to achieve these targets，the effective way is to determine the bearing ratio between the pile and as three，enlarge the distance between piles and enhance the replacement rate． If the rigid composite foundation is designed with the proposed method and the pile reaches at the supporting course，the settlement deformation of the embankment can be controlled to meet the specification requirement of the post － construction settlement for the bridgehead and the cost can be largely reduced．
Chen Renpeng，Xu Feng，Chen Yunmin，etc． Analysis of Behavior of Rigid Pile － supported Embankment in Soft Ground ［J］． China Journal of Highway and Transport，2005( 3) : 7 － 13．
Cao Weiping， Ling Daosheng， Chen Yunmin． Field Tests on Arching of Highway Embankments Reinforced with Rigid Piles and Their Comparison with Current Analytical Methods［J］． Chinese Journal of Geotechnical Engineering，2007( 10) : 1577 － 1581．
Zheng Junjie，Ou Jianhua，Yuan Neizhen，etc． A New Way to Calculate Modulus of Compressibility of Composite Foundation ［J ］． Journal of Railway Engineering Society，2003( 1) : 116 － 119．
Rui Rui，Xia Yuanyou． Research on Load Transfer Mechanism and Calculation Method of Embankment Supported by Piles［J］． Journal of Wuhan University of Technology，2009( 13) : 73 － 77．
Lou Yan，He Ning，Lou Bin． Effect Analysis of Deep Soft Foundation Stabilized by Pipe Pile Composite Foundation at End of a Bridge［R］． Nanjing: Nanjing Hydraulic Research Institute，2007．
Lou Yan，He Ning，Lou Bin． Effect Analysis of Deep Soft Foundation Stabilized by CFG Pile Composite Foundation at End of a Bridge ［R］． Nanjing: Nanjing Hydraulic Research Institute，2006．
Lou Yan，He Ning，Lou Bin． Application of Long － short Piles Composite Foundation in Strengthening Deep Soft Ground at the End of Bridge［J］． Construction Technology，2009( 10) : 90 － 93．
［11］ JTG D30—2004，公路路基设计规范［S］． JTG D30—2004，Specifications for Design of Highway Subgrades［S］．
2011, Vol. 28 
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