中文摘要：

首先,在深入研究基坑支护方案确定之影响因素基础上,确定出其主要影响因素及评价指标,并根据影响因素与评价指标的层次性和模糊性特点建立出基坑支护方案确定的综合优化评价模型;其次,针对评价指标取值不确定性特点提出采用区间数表示其属性值的方法,并通过探讨有关区间属性值与区间数权向量确定方法及区间关联分析方法等问题,从而建立出基坑支护方案的区间关联度分析方法;然后,引进相对优势度分析方法,建立出基坑支护方案确定的区间关联模糊优化方法;最后,通过工程实例计算,并与其它分析方法进行对比分析,表明了该方法的可行性与合理性。

英文摘要：

First, the main factors and evaluating indices were decided based on the deep researches on factors to determine support schemes for foundation pit, and a comprehensive optimization evaluation model was established according to their hierarchy and fuzziness. Secondly, an approach to represent the attribute value of evaluating indices by adopting interval numbers were suggested according to the uncertainty feature, and by studying such questions as the determining method of interval attribute values and interval weight vectors, as well as interval relative analytic method and so on, the calculating method of interval relative degree for support schemes of pit foundations was developed. Then, the analytic method of degree of relative superiority was introduced to set up the interval relative fuzzy optimization method to determinine support schemes for foundation pits. Finally, the feasibility and rationality of the proposed method was shown by the practical engineering calculation and comparative analysis with other methods.