砂土地震液化势的变权重二级模糊综合评判方法研究

On a Two-stage Fuzzy Synthetic Judgment with Changing Weight Value for Seismic Liquefaction of Sands

考虑砂土地震液化影响因素的层次性和模糊性的特点,引入模糊数学理论.解决模糊数学中隶属度的确定问题,并运用层次分析法确定各因素权重,考虑实际情况对各因素进行变权处理,从而建立砂土液化势的二级模糊综合评判模型.通过工程实例计算,并与实测结果相比较,验证了该方法的可行性和合理性.

Considering the gradation of liquefaction factors of sands and the fuzzy characteristics of the factors, the author employs a fuzzy mathematical method to determine the values of degrees of membership for all the affecting factors and adopts AHP to determine the basic weight value of all the affecting factors and considers the practical condition to deal with the basic weight values through changing weight value, and establishes a model of synthetic judgment on the two- stage fuzzy classification of liquefaction of sands Through analysis and calculation with an engineering example, it shows the proposed classification method is both practicable and reasonable.