基于动态权重的土质岸坡稳定性模糊评价方法
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摘要
库岸边坡稳定性的快速评价对工程建设及灾害治理具有重要意义。针对传统综合评价法存在指标权重相对固定的不足,提出了一种基于动态权重的边坡稳定性综合评价方法。首先建立土质岸坡的多层次多指标稳定性评价体系,然后采用简单关联函数和层次分析法分别计算指标客观权重和主观权重,通过主客观综合赋权确定一个随指标取值变化的指标动态权重,最后引入可变模糊集理论提出基于动态权重的土质岸坡稳定性多级可变模糊评价方法。运用该方法分析了三峡库区周家坡滑坡在3种库水位下降速率时的稳定性,并采用极限平衡法验证了评价结果,实证研究表明动态权重法简便实用、科学合理,计算结果比传统的静态权重法更贴近工程实际。
Evaluation of reservoir bank stability is very important in engineering construction and landslide disaster control.In order to avoid the deficiency of the fixed index weights of traditional comprehensive evaluation,a new evaluation method for slope stability based on dynamic weight is proposed.First,the index system and grading criterion for reservoir bank slope are established;second,the index objective weight and subjective weight are calculated by integrating simple relevance function and analytic hierarchy process(AHP),hence the dynamic synthetic weight,which varies with the index characteristic values,is determined by synthesizing the index objective weight and subjective weight;finally,by introducing the theory of variable fuzzy sets,the evaluation method for reservoir bank stability using multi-level variable fuzzy sets based on dynamic weight is presented.With this method,the stability of Zhoujiapo landslide under three different water level drawdown velocities is evaluated,and the evaluation results are validated by means of limit equilibrium method.The results show that the new method based on dynamic weight is simple and practical,and it gives more reasonable results which correspond to the actual projects than the traditional method does.
Evaluation of reservoir bank stability is very important in engineering construction and landslide disaster control.In order to avoid the deficiency of the fixed index weights of traditional comprehensive evaluation,a new evaluation method for slope stability based on dynamic weight is proposed.First,the index system and grading criterion for reservoir bank slope are established;second,the index objective weight and subjective weight are calculated by integrating simple relevance function and analytic hierarchy process(AHP),hence the dynamic synthetic weight,which varies with the index characteristic values,is determined by synthesizing the index objective weight and subjective weight;finally,by introducing the theory of variable fuzzy sets,the evaluation method for reservoir bank stability using multi-level variable fuzzy sets based on dynamic weight is presented.With this method,the stability of Zhoujiapo landslide under three different water level drawdown velocities is evaluated,and the evaluation results are validated by means of limit equilibrium method.The results show that the new method based on dynamic weight is simple and practical,and it gives more reasonable results which correspond to the actual projects than the traditional method does.
引文
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[2]谈小龙,徐卫亚,梁桂兰.可拓方法在岩石边坡整体安全评价中的应用[J].岩石力学与工程学报,2009,28(12):2503-2509.(TAN Xiao-long,XU Wei-ya,LIANG Gui-lan.Application of Extenics Method to Com-prehensive Safety Evaluation of Rock Slope[J].ChineseJournal of Rock Mechanics and Engineering,2009,28(12):2503-2509.(in Chinese))
[3]陈昌彦,王思敬,沈小克.边坡岩体稳定性的人工神经网络预测模型[J].岩土工程学报,2001,23(2):157-161.(CHEN Chang-yan,WANG Si-jing,SHENXiao-ke.Predicting Models to Estimate Stability of RockSlope Based on Artificial Neural Network[J].ChineseJournal of Geotechnical Engineering,2001,23(2):157-161.(in Chinese))
[4]唐海,万文,刘金海.基于未确知测度理论的地下洞室岩体质量评价[J].岩土力学,2011,32(4):1181-1185.(TANG Hai,WAN Wen,LIU Jin-hai.E-valuation of Underground Cavern Rock Quality Based onUncertainty Measure Theory[J].Rock and Soil Mechan-ics,2011,32(4):1181-1185.(in Chinese))
[5]谢全敏,朱瑞赓.岩体边坡稳定性灰色聚类空间预测方法[J].金属矿山,1997,21(2):97-101.(XIEQuan-min,ZHU Rui-geng.The Grey Classification Clus-tering Method for Space Prediction of the Stability of RockMass Slope[J].Metal Mine,1997,21(2):97-101.(in Chinese))
[6]陈守煜.工程可变模糊集理论与模型——模糊水文水资源学数学基础[J].大连理工大学学报,2005,45(2):308-312.(CHEN Shou-yu.Theory and Model ofEngineering Variable Fuzzy Set:Mathematical Basis forFuzzy Hydrology and Water Resources[J].Journal ofDalian University of Technology,2005,45(2):308-312.(in Chinese))
[7]陈守煜,王子茹.基于对立统一与质量互变定理的水资源系统可变模糊评价新方法[J].水利学报,2011,42(3):253-261.(CHEN Shou-yu,WANG Zi-ru.Wa-ter Resource Systems’Variable Fuzzy Sets EvaluationNew Method Based on the Opposites Unity and Quantity-Quality Exchange Theorem[J].Journal of Hydraulic En-gineering,2005,42(3):253-261.(in Chinese))
[8]陈守煜,胡吉敏.可变模糊评价法及在水资源承载能力评价中的应用[J].水利学报,2006,37(3):264-271.(CHEN Shou-yu,HU Ji-min.Variable Fuzzy As-sessment Method and Its Application in Assessing WaterResources Carrying Capacity[J].Journal of HydraulicEngineering,2006,37(3):264-271.(in Chinese))
[9]冯文凯.库岸公路边坡稳定性风险分析[D].成都:成都理工大学,2005:77-79.(FENG Wen-kai.RiskAnalysis of Stability of Highway Bank Slopes[D].Chengdu:Chengdu University of Technology,2005:77-79.(in Chinese))
[10]黄祥志,佘成学.基于可拓理论的围岩稳定分类方法的研究[J].岩土力学,2006,27(10):1800-1804.(HUANG Xiang-zhi,SHE Cheng-xue.Research onMethods of Surrounding Rock Masses Stability Classifica-tion Based on Extension Theory[J].Rock and Soil Me-chanics,2006,27(10):1800-1804.(in Chinese))
[11]SAATY T L.Modeling Unstructured Decision ProblemsTheory of Analytical Hierarchies[J].Mathematics andComputers in Simulation,1978,20(3):147-157.
[12]朱杰兵,汪斌,李聪,等.三峡库区高速公路库岸再造防治技术研究[R].武汉:长江科学院,2011.(ZHU Jie-bing,WANG Bin,LI Cong,et al.Researchon the Prevention and Control Technology of HighwayBank Rebuilding in Three Gorges Reservoir Area[R].Wuhan:Yangtze River Scientific Research Institute,2011.(in Chinese))