基于主客观组合赋权-云模型的边坡稳定性评价

Evaluation of the slope stability based on the CRITIC-G1 cloud model

边坡工程在外力作用下易造成滑坡、泥石流等地质灾害,严重影响周边的人民生命财产安全。选取边坡角、边坡高度、天然容重、孔隙水压力比、黏聚力、内摩擦角等6个评价指标,运用CRITIC法和序关系分析法(G1法)分别计算6个评价指标的客观权重和主观权重,并用博弈论对权重进行组合赋权,最后确定综合权重。结合正向云发生器,计算出边坡不同等级的隶属度,并与CRTIC法评价结果及实际等级进行对比,结果表明:边坡稳定性评价的准确率与权重息息相关,利用CRITIC-G1云模型所得的组合权重准确率高达91.7%,而CRITIC法的准确率仅为75%。随机抽取5组数据检验CRITIC-G1云模型的合理性和可靠性,结果显示CRITIC-G1云模型的边坡稳定性等级评价结果与实际边坡稳定性等级相吻合,证明该方法可以用于边坡稳定性的分析与评价。

Slope engineering is prone to geological disasters such as landslides and mudslides under external forces seriously,affecting the safety of people's lives and property in the surrounding area.Six evaluation indexes such as slope angle,slope height,natural bulk density,pore-water pressure ratio,cohesion force and internal friction angle are selected.The objective and subjective weights of the six evaluation indexes are calculated respectively by CRITIC method and order relationship analysis method(G1 method).The weights are combined and weighted by game theory,and finally the comprehensive weight is determined.Combined with forward cloud generator,the membership degrees of different grades of slopes are calculated and compared with the evaluation results of the CRITIC method and the actual grades.The results show that the accuracy of slope stability evaluation is closely related to weight.The accuracy of combination weight obtained by CRITIC-G1 cloud model is as high as 91.7%,while the accuracy of CRITIC method is only 75%.Five groups of data were randomly selected to test the rationality and reliability of CRITIC-G1 cloud model.The results show that the evaluation results of slope stability grade of CRITIC-G1 cloud model are consistent with the actual slope stability grade,which proves that this method can be used for the analysis and evaluation of slope stability.