[提要]  深基坑支护系统方案的优化设计是一个相当复杂的系统工程优化问题。根据长江一级阶地的工程地质和水文地质特点构造层次结构模型，采用层次分析方法建立起深基坑支护系统方案的评价体系。通过对各种可行方案的定量评价对比，优选出最佳方案以达到深基坑支护系统方案优化设计的目的。并对评价指标进行了规一化处理。
[关键词]  基坑支护 方案  优化 指标 权重 规一化

It is very difficult to optimize the bracing project of deep foundation pit. By the analytical hierarchy pro-
cess method, the project evaluation system is set up in accordance with engineering geological and hydrological geological condition of the first Yangtze River's terrace. The optimal plan is elected by appraising all possible projects qualitatively. The qualitative and quantitative evaluation targets are dealt with by the normalized method.
Keywords: bracing; foundation  pit; project; optimization; target; relative  weight  number; normalization