Study On Seepage Safety Evaluation Of Concrete Gravity Dam Based On Extension Cloud Model

Seepage safety is the basis for ensuring safe and stable operation of concrete gravity dams.Therefore seepage safety assessment is a key issue in the safety assessment of concrete gravity dams.However,the factors affecting the safety and stability of seepage in concrete gravity dams are complex.How to build a reasonable safety evaluation index system for seepage safety and comprehensively consider the influence of correlation between indexes on index weight coefficient is the difficulty of seepage safety assessment.At the same time,because of the fuzziness of the classification grade of seepage safety grade,randomness will be generated in the process of obtaining data and data through monitoring instruments.How to solve the uncertainty problem in the process of seepage safety assessment is a key issue in related research.These problems lead to the current seepage safety evaluation method which can't effectively evaluate the seepage safety of concrete gravity dams.In order to solve these problems,this study takes the seepage safety evaluation of concrete gravity dam as the main line,constructs the seepage evaluation index system based on DSR model,and combines the influence matrix and the correlation coefficient weighting method,puts forward the subjective and objective comprehensive empowerment method.And considering the uncertainty of the seepage safety evaluation,the seepage safety evaluation model of concrete gravity dam based on the extension cloud theory is proposed in this study.The specific research results are as follows:1.The DSR(Driving-State-Relevance)model is used to establish the percolation evaluation index system which considers the relationship between the environmental factors and the indexes.In order to solve the problem of the seepage safety evaluation of the concrete gravity dam,the number of evaluation indexes,the complex relationship and the difficult to construct a scientific and reasonable evaluation index system are solved.Most of the studies on safety assessment index system for concrete gravity dams have focused on existing monitoring data.The evaluation index system can not reflect the environmental factors and the correlation and change rate among the indexes,and the index system is too simple to effectively reflect the true state of the seepage safety of the concrete gravity dam.In view of the above problems,a safety evaluation index system for concrete gravity dam based on DSR model is proposed and established.The dam seepage evaluation index system is divided into environmental driving force index,dam seepage monitoring state index and monitoring quantity correlation response index,thus the seepage safety evaluation index system of multi level and multi index concrete gravity dam is established.2.In order to solve the problem that the index weighting in the seepage safety evaluation of concrete gravity dam is easy to ignore the influence of the correlation among the indexes,and the weight coefficient is difficult to match the actual situation,this study adopts the subjective and objective comprehensive empowerment method based on the subjective weight of the influence matrix and the objective weight based on the correlation coefficient weighting method.Most of the existing studies on the weight of evaluation index only consider the subjective weight of the index or the objective weight,which is one-sided,or consider the subjective weight and the objective weight,and ignore the repeated calculation of the weight coefficient caused by the correlation among the indexes,which leads to the irrational empowerment of the index,resulting in the inaccuracy of the evaluation results.In order to solve the above problems,the subjective and objective weighting method based on the subjective weight of the influence matrix and the objective weight based on the correlation coefficient weighting method is used in this study,which can obtain more practical weight coefficients and improve the accuracy of evaluation results,taking account of the correlation among indexes.3.In order to solve the fuzziness of hierarchical boundary in the evaluation process and the uncertainty of randomness produced in the process of obtaining data and data through monitoring instruments,this study proposes a seepage safety evaluation model based on the extension cloud theory to evaluate the seepage safety of concrete gravity dam.Because of the fuzzy relationship between the evaluation indexes and the results of the evaluation,the relationship between the indexes and the final evaluation results is not clear.The seepage safety evaluation is a multi index comprehensive evaluation problem with many uncertainties.The seepage safety of the concrete gravity dam has been found.The study of evaluation often ignores a large number of uncertainties in the evaluation process.In view of the above problems,a seepage safety evaluation model based on extension cloud theory is put forward to evaluate the seepage safety of concrete gravity dams,which deals with fuzziness and randomness in the evaluation process,and makes the evaluation results more reasonable and accurate.Finally,an example of a concrete gravity dam is verified.The above research method is used to evaluate the seepage safety of the project,and the evaluation results are compared with other methods,which proves the effectiveness and superiority of the evaluation method.