中文摘要：

对深基坑支护方案和所选支护类型细部结构的设计计算两个方面的优化进行了探讨。运用多目标决策模糊集理论和层次分析法来优选具有多种属性和模糊特性的深基坑支护方案。通过确定决策变量、目标函数、约束条件（如强度、尺寸、位移等）和优化算法等来优选所选定的支护类型细部结构，达到成本最低的目的。利用软件Matlab 6．5比较容易求解这样一个非线性有约束的多元函数的最小值。工程实例研究表明：在优化深基坑支护方案和支护类型的细部结构方面有很好的效果。

英文摘要：

The optimization methods including schemes of the supporting system and the detailed calculation and design of the selected program for deep foundation pit, are studied. Using multi-objective decision making fuzzy set analysis and analytical hierarchy process, the optimized project of the retaining system that is of the multiple attribute and fuzzy property is selected. Through the selection of decision variables, objective function, constraint condition （i.e. strength, size, displacement etc.） and optimization algorithm, the detailed structure of the selected program can be optimized in order to minimize the cost of construction. By the software Matlab 6.5, it is easy to solve this minimized value of nonlinear constraint minimization value. A practical example study shows that there is better effect on both selecting the retaining program and deciding the detailed structure.