【摘要】 为了对砂土震动液化势进行预测,采用模糊综合评判理论建立了砂土液化可能性的模糊综合评判数学模型。选取标准贯入锤击数、地下水位、地震烈度、粘粒含量等4个实测特征指标作为模糊综合评判的因素集,对4个因素构造了相应的隶属函数,建立模糊关系矩阵,并依据4个因素在判别中的不同作用,拟定了对应的权重,运用N(·,+)算子对模糊矩阵进行运算,依据评判等级进行最终判别。通过对历史地震中砂土液化的实测数据进行综合评判验证,获得了非液化的判别正确率为85%,液化判别正确率为88%的较好结果。研究结果表明,模糊综合评判方法可有效地预测砂土液化势,可以作为砂土液化预测的方法之一。更多还原

【Abstract】 In order to forecast the liquefaction of sand soil,fuzzy comprehensive evaluation model which is based on fuzzy comprehensive evaluation theory was established for forecasting the possibility of sand liquefaction.Four factors,i.e.blow number of standard penetration test,groundwater level,seismic intensity,and clay content were selected as the discriminant factors of the fuzzy comprehensive evaluation model.Corresponding membership functions and fuzzy relation matrixes of 4 factors were constructed.Based on the 4 factors in the discrimination of different roles,corresponding weights were made.The operation of N(·,+) was applied to calculate fuzzy matrix.Final judgment was made on the basis of evaluation grades.A series of historical earthquake data of sand liquefaction measured were judged with the fuzzy comprehensive evaluation.The correct rate of nonliquefaction was 85% and the correct rate of liquefaction was 88%.The results show that the fuzzy comprehensive evaluation model is one of the efficient methods for prediction of sand liquefaction.更多还原