关键词: 平原水库, 多阶段设计变更, 协同优化, 技术-经济-安全, 动态权重

Abstract: To address the challenge of imbalances in technical, economic, and safety objectives caused by multi-stage design changes for plain reservoirs, this study takes Dongxing reservoir on the Eastern Route of the South-to-North Water Diversion Project as an example and aims to develop a method for the synergistic optimization of technical, economic, and safety factors. Through literature review, case analysis, and quantitative modeling, an evaluation system comprising 12 indicators across three dimensions is established, and a multi-stage synergistic optimization model based on dynamic weighting is developed. The results show that applying this model to optimize dam height, seepage control, and spoil disposal schemes can increase the technical compliance rate by 12.3%, save 19 464 400 yuan in investment, and reduce the risk of dam failure by 31.7%. This model can effectively balance conflicting objectives during multi-stage design changes and provide a theoretical basis and practical tools for the refined design and full life-cycle management of similar plain reservoir projects.

Key words: plain reservoir, multi-stage design change, synergistic optimization, technology-economysafety, dynamic weight