Research on interval variable weight fuzzy evaluation method for subgrade stability in seasonal frozen area

摘要

There are limitations and shortcomings by using the fuzzy evaluation method to estimate the subgrade stability in seasonal frozen area at present. Based on the consideration of the fuzziness and hierarchy of the main factors for the subgrade stability, a fuzzy synthetic evaluation model for the subgrade stability in seasonal frozen area is established. By use of the variable weight principle, the interval mathematics theory and the relative superiority degree method of interval number matrix, the interval fuzzy evaluation theory for subgrade stability in seasonal frozen area is developed, which can reduce the subjectivity of evaluation and reflect the influence on the assessment results when the actual value of evaluation indexes change. So the method makes the evaluation for subgrade stability in seasonal frozen area much more rational and easier to operate. The calculated results of practical engineering and its comparison with other methods show that the proposed method is practicable and reasonable.