MC桩组合支护结构稳定性分析

针对按照传统水泥土挡墙稳定性分析方法来计算MC桩组合支护结构稳定性的不足，根据极限平衡理论，结合MC桩组合支护结构的特点，建立了新的抗倾覆稳定性计算方法，分析了不同因素对组合支护结构抗倾覆稳定性的影响。结果表明，C桩宜布置在组合支护结构前侧，转动点位置宜选取在C桩桩端以上，并可适当增加M桩的长度、宽度以及C桩长度来提高稳定性。最后，运用分析的结果和实际工程经验，建议了MC桩组合支护结构的设计参数。

Stability analysis of MC composite support structure

Aimed at the lack in traditional analysis method used in soil-cement wall stability, when it is applied to stability analysis of MC composite support structure, a new computing way for anti-overturning stability was developed based on the limit equilibrium theory in combination with the characteristics of MC piles. According to the new method, various factors affected anti-overturning stability of MC piles were analyzed. The results indicate that, C pile is reasonably located in front side of the composite support structure; and the rotation point of overturning is reasonably located above on the end of C pile. Furthermore, the length and width of M pile, length of C pile can be properly increased to enhance the stability of MC piles. Finally, some advices on designing parameters of MC piles are given in terms of the conclusions of analysis and actual experiences in practices.