MC桩组合支护结构在淤泥质土基坑工程中的应用分析

结合某淤泥质土环境基坑支护工程实例，采用有限元数值分析方法，探讨水泥土桩与混凝土桩组合支护结构（MC桩）力学变形特性，包括MC桩截面参数对支护结构水平位移、地表沉降以及坑底隆起量影响．研究结果表明，MC桩组合支护结构在淤泥质基坑中，有利于控制基坑变形，增加基坑稳定性；M桩挡墙宽度对减小支护结构变形效果明显，增大墙宽可以减小墙身弯矩以及支护结构墙体倾斜变形并且可降低坑底隆起量和坑外地表沉降量．而且，在同挡墙宽度情况下，有无C桩对控制支护结构变形和基坑变形也有很大的作用．

Analysis of Application of MC Pile Composite Retaining Structure in Muddy Soil Foundation Pits

This paper explores the mechanical deformation characteristics of cement soil pile and concrete pile composite retaining structure （ MC pile） by analyzing a muddy soil foundation pit project using finite element analysis method. The mechanical deformation characteristics involve the effects of MC pile section parameters on the horizontal displacement of supporting structure, the settlement of ground surface and the swell of pit bottom. The results show that the MC pile composite retaining structure can control the deformation of the muddy soil foundation pit and increase the stability of the pit; the M pile retaining wall width has a dramatic impact on reducing the deformation of the retaining structure; the increase in the wall width can reduce the bending moments in the wall, the inclination and deformation of supporting structure walls, the bottom heave and pit field surface settlement. Moreover, C piles play a key role in controlling the deformation of the retaining structure and that of the foundation when the wall widths are the same.