Study on interval relative fuzzy optimization method to determinine support schemes for foundation pits

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.