MC桩组合支护结构设计与应用研究

水泥土重力式挡墙与混凝土桩组合支护结构（MC桩）近年来开始在支护工程中得到应用，但由于缺乏对其工作机理和变形特性进行研究，实际工程多采用经验设计法，缺乏理论依据。通过对组合支护结构相关问题的研究，特别是对MC桩组合支护结构设计中几个关键问题进行分析，提出了M桩、C桩的设计方法；结合MC桩组合支护结构的特点，建议了新的稳定性计算方法，可供组合支护结构设计时参考。通过将此设计方法应用于实际工程，验证了其可行性。

Design of MC composite retaining structure and its application

The composite retaining structure of soil-cement pile and concrete pile (named MC pile) is applied to the projects in recent years. Due to lack of researches in view of service mechanisms and deformation characteristics of the composite retaining structure, experience design method that lacks of theoretical basis is usually applied to design composite retaining structure in practical project. Through studying some problems of composite retaining structure, especially several key issues about designing MC pile retaining structure, the methods to design M pile and C pile are put forward; with the characteristics of the MC pile composite retaining structure, a new stability calculation method for the composite structure design is proposed. Finally, applying the design method to actual project, the results demonstrate the feasibility of the method.