Research On Engineering Geological Condition Evaluation Of Dam Site Based On Interval Number Fuzzy Analytic Hierarchy Process

The scale of the hydraulic engineering is huge,and the pros and cons of the engineering geological conditions at the dam site will greatly affect the important aspects of the engineering's construction cycle,project cost,and future operational safety.Once engineering geological problems occur,the lighter ones will delay the construction period,leading to increased investment;the serious ones will affect the operation of the project,or lose benefits;moreover,the hydraulic engineering will cause damage to the national construction and the safety of people's lives and property.Therefore,we must attach great importance to the evaluation of engineering geological conditions and provide corresponding reference for the selection of reasonable sites for hydraulic construction.At present,the related research on the evaluation of engineering geological conditions for dam sites of water conservancy projects is not comprehensive enough.This paper analyzes and selects the engineering geological evaluation indicators of the dam site,constructs the corresponding evaluation index system,and establishes the evaluation model by using the improved fuzzy analytic hierarchy process,and validates the model with examples,and draws the corresponding evaluation results.The main research work and results are as follows:(1)This paper analyzes and summarizes the current status of domestic and international research in engineering geological evaluation.Combined with the characteristics of hydraulic engineering,the interval number fuzzy analytic method is adopted,which comprehensively utilizes the respective advantages of the fuzzy analytic hierarchy process(FAHP),interval number theory and TOPSIS method to calculate the analysis and evaluation process simple and reliable.(2)In this paper,the suitability of the engineering geological conditions of the dam site is used as the target layer,and 7 criteria layer indexes,such as topography,lithology,and rock structure,and the corresponding 21 lowest-level indexes are used to establish an index system of engineering geological conditions for the dam site.Based on the evaluation index system,an improved fuzzy analytic hierarchy process is used to introduce the entire analysis and calculation process of engineering geological conditions evaluation at the dam site in detail to complete the engineering geology of the dam site establishment of evaluation model.(3)The dam site engineering geological condition evaluation model constructed in this paper is applied to Zhangjiapo Reservoir engineering example to verify the scientificity and feasibility of the evaluation model.It is concluded that the engineering geological conditions of the middle dam site are better and suitable for engineering construction.The research results have certain reference significance for the evaluation of similar engineering geological conditions.