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1. 西藏农牧学院
2. 水电水利规划设计总院
Published:2025
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陈翔宇, 郭永刚, 周兴波, et al. 基于BO-GBDT的水库大坝震害快速评估[J]. Bulletin of Geological Science and Technology, 2025, 44(3): 242-254.
陈翔宇, 郭永刚, 周兴波, et al. 基于BO-GBDT的水库大坝震害快速评估[J]. Bulletin of Geological Science and Technology, 2025, 44(3): 242-254. DOI: 10.19509/j.cnki.dzkq.tb20240425.
水库大坝是重大生命线工程,地震发生后如何快速有效地进行水库大坝的震害评估,对抢险方案制定和灾后修复重建意义重大。为了快速准确地对遭受地震侵袭的水库大坝破坏程度进行评估,选取汶川8.0级大地震各水库大坝的震损详情,结合大坝的结构特点和地震强度构建了评估指标体系和数据集,使用k邻近插补法对样本的缺失值进行了处理,并判断样本特征相关性,提出了一种基于梯度提升树算法的水库大坝震害快速评估模型。使用网格搜索(grid search,简称GS)、粒子群搜索(particle swarm optimization,简称PSO)、贝叶斯搜索(Bayesian optimization,简称BO)和超带搜索(hyperband search,简称HS)4种超参数优化方法对梯度提升树(gradient boosting decision tree,简称GBDT)回归算法进行了参数优化,根据各模型的性能指标(决定系数R
2
、均方根误差RMSE、平均绝对误差MAE)进行了对比,并对最优模型的特征重要性进行了排序。结果表明:BO-GBDT模型能以最短耗时以及较高精度对水库大坝震害程度进行评估,其决定系数R
2
高达0.99,特征重要性分数表明最大缝宽是影响最大的因素。使用该模型与基于改进经验统计模型的土坝震害评估模型评估结果对比,准确度有进一步提高,验证了该模型在水库大坝震后震害快速调查评估应用中的可靠性。研究成果为水库大坝的震害评估提供了参考依据。
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