Application of GT-DEMATEL-ANP Method in the Health Evaluation of Hydraulic Steel Gates

Abstract

Hydraulic steel gates are extensively utilized in water conservancy and hydropower projects. However, due to the serious issue of overdue service and sloppy operation and maintenance, many of them suffer from long-term operational issues, leading to frequent sudden accidents that endanger the safety of people's lives and property. Therefore, accurately evaluating the health state of hydraulic steel gates is crucial for ensuring their safe operation. Firstly, accident cases of hydraulic steel gates are collected, and the influencing factors are analyzed using Grounded Theory (GT). Then, a health evaluation index system consisting of 3 sub-objectives (safety, adaptability, durability), 9 primary indexes, and 23 secondary indexes is constructed. Secondly, the weights of evaluation indexes are determined by applying the Decision-making Trial and Evaluation Laboratory (DEMATEL) and Analytic Network Process (ANP) method. Finally, a health evaluation model is established based on the Fuzzy Comprehensive Evaluation (FCE) method, and the health assessment is carried out by taking the plain gate of a reservoir spillway tunnel as an example. The results show that compared to the Fuzzy Analytic Hierarchy Process (FAHP) weighting method or ANP weighting method alone, the GT-DEMATEL-ANP method comprehensively considers indicator applicability, correlation, and importance, enhancing weight calculation accuracy and scientific assignment, resulting in a more accurate health evaluation.