基于改进层次分析-可拓学模型的库岸稳定评价

Evaluation of reservoir bank slope stability based on improved analytic hierarchy process and extension model

针对库岸边坡稳定性评价过程中指标权重获取繁琐与主观干扰共存的问题,构建了一种基于改进的层次分析法与可拓理论相结合的评价模型。以三峡库区上游长寿至丰都段库岸为研究对象,在遥感解译及实地调查的基础上,结合库区上游岸坡特征,选取地形地貌、地层岩性、岸坡结构等11个因素作为评价指标,采用改进的层次分析法来确定评价指标权重,运用可拓学理论构建经典域物元、节域物元和关联函数,建立库岸稳定性评价的层次分析法-可拓理论模型,并应用于调查区域内库岸稳定性评价。评价结果表明:库岸以稳定性好和较好为主,占库岸总长度的77.8%,稳定性较差和稳定性差的库岸段占22.2%,与实际调查结果有较好的吻合度。研究结果可为库区地质灾害防灾减灾、监测预警提供合理的科学依据。

Aiming at the coexistence of complicated and subjective interference in obtaining index weights in the process of evaluating the stability of reservoir bank slope,a new model is built to evaluate the bank slope stability based on improved analytic hierarchy process and extension theory.Taking the bank of Changshou to Fengdu section in the upper reaches of the Three Gorges Reservoir area as the research area,based on the remote sensing interpretation and field investigation,and combined with the characteristics of the bank slope,11indicators such as topography and landform,stratigraphic lithology and slope structure etc.,are selected as evaluation indexes.By using the improved analytic hierarchy process(AHP)to determine the weight of the evaluation index and the extension theory to construct classical domain matter-element,node domain matter-element and correlation function,the AHP-extension theory model for the evaluation of reservoir bank slope stability is established and used to evaluate the stability of the bank slopes in the investigation area.The evaluation results show that the stability of reservoir bank slopes are mainly stable,accounting for77.8%of the total length of the studied banks,and the poor stability accounts for22.2%,which are in good agreement with the actual investigation.The results could provide reasonable and scientific basis for disaster prevention and mitigation,monitoring and early warning in reservoir area.