基于主客观赋权和功效系数法的膨胀土胀缩性评价  

Evaluation of swelling-shrinkage of expansive soil based on subjective and objective weighting and efficiency coefficient methods

作　　者：宋成林 张大亮 王迎超 徐杭 李青理 SONG Chenglin;ZHANG Daliang;WANG Yingchao;XU Hang;LI Qingli(Luan-Lu-Yu-Shan LLYSSG-2 Bid Project Management Department,CCCC Construction Group Co.,Ltd.,Sanmenxia Henan 472000,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou Jiangsu 221116,China)

机构地区：[1]中交建筑集团有限公司栾卢豫陕LLYSSG-2标项目经理部,河南三门峡472000 [2]中国矿业大学力学与土木工程学院,江苏徐州221116

出　　处：《地质科技通报》2024年第6期136-143,共8页Bulletin of Geological Science and Technology

基　　金：国家重点研发计划课题(2022YFC3003304);江苏省自然科学基金项目(BK20242087);中交建筑集团有限公司栾卢豫陕LLYSSG-2项目经理部科研项目(2023030018)。

摘　　要：膨胀土胀缩等级的分类是治理膨胀土工作中的首要问题,为了精确评价膨胀土胀缩性,便于现场安全施工,防灾减灾,将功效系数法应用于膨胀土胀缩等级的分类问题中。选用液限、胀缩总率、塑性指数、天然含水率和自由膨胀率为评价指标,采用德尔菲法和熵权法相结合的主客观赋权确定各指标的权重系数,通过计算样本总功效系数值来确定最终评价结果,建立了一个新的膨胀土胀缩等级评价模型,选取19组膨胀土实测数据进行了模型检验,其中有15组数据与其他方法进行了对比分析,有4组数据与实际情况进行对比分析。研究结果表明:与模糊数学、物元可拓法、变权靶心贴近度法和未知测度法对比分析的15组数据准确率达到93.3%;与实际情况对比的4组数据准确率达到了100%。研究成果证明了功效系数法用于膨胀土胀缩等级划分的合理性和有效性,对膨胀土现场安全施工具有指导意义。[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.

关 键 词：膨胀土 胀缩等级 熵权法 德尔菲法 功效系数法 主客观赋权法 

分 类 号：TU443[建筑科学—岩土工程]