[Objective]Classifying the swelling-shrinkage degree of expansive soil is a critical issue in their man-agement of expansive soil.To prevent and mitigate engineering disasters,accurate evaluation of the swelling-shrink-age for expansive soil is essential.This study applies the efficacy coefficient method to classify the swelling-shrink-age grade of expansive soil.[Methods]Five factors(the liquid limit,total swell-shrink ratio,plastic index,water content,and free swelling ratio)are selected as evaluation indices to comprehensively assess the swelling-shrinkage characteristics.The weight coefficients of these indices are determined using both objective and subjective weighting method,namely the Delphi method and information entropy theory.The final classification is obtained by calculat-ing the total efficacy coefficient of the sample.A new model for evaluating the swelling-shrinkage grade of expansive soil is established using the efficacy coefficient method in combination with the subjective and objective weighting approach.The model is tested on 19 sets of field test data from relevant literature,with 15 groups of data compared to other methods and 4 groups of data compared to actual situation.[Results]The accuracy of the model,when compared with extension theory,the variable weight and the unascertained measurement method,reached 93.3％for the 15 groups of data.For the 4 groups of data compared with the real-world conditions,the accuracy reached 100％.[Conclusion]The proposed model is both reasonable and effective in classifying the swelling-shrinkage grade of expansive soil,offering valuable guidance for the safe construction of expansive soil projects.
维普
万方数据