蔡伟铭  熊祚森
    （同济大学地下系  上海 200092）

[提要]  软土地基上的深基坑支护结构都采用多支撑形式，本文采用土体弹簧系数K=C v厂Z（即通常称之为“C”法），并考虑分步开挖逐层支撑的施工过程对支撑力、桩身内力及位移的影响，推导了以挠曲线方程为基础的计算方法，是继“m”法之后的又一发展。该法便于计算，对于少于三道支撑的情况，用手算也很方便，对于更多支撑的情况则可采用电算。“C”法比“m”系数法更适合于软土地基，计算结果与实测位移曲线很吻合。
[关键词]  支挡结构 多支撑 弹性曲线 弹簧地基 C模型 开挖过程

Multi-Braced retaining .structures have been widly employed in deep excavation. A calculating method using spring factor of K =Cv厂Z is presented in this paper, having taken into account the effect of staged excavation upon the bracing force, andthe internal force and displacement of retaining wall. This is a development following "m" method. For soft soil, the results calculated from "C" method are consistent with the measured value better than that form "m" method.
Keywords: retaining structure; multistorey bracing; staged excavation; "C" method