摘要
为了对堰塞坝的稳定性快速作出定量评价,通过分析历史案例并进行相关性分析,选取堰塞坝坝长、坝宽、坝高、回水长度、库容量作为堰塞坝稳定性评价因素,并进行主成分分析。将单一变量按照主成分大小及权重进行组合,得到坝高因子,高宽比,水流冲击系数,湖面形状系数,坝体形状系数五个复合因素,在此基础上提出一种定量分析堰塞坝稳定性的快速评估模型,同时引入稳定性系数来反映堰塞坝的稳定程度,进行等级划分,并对汶川大地震中形成的小岗剑(上)堰塞坝应用模型进行评估。结果表明所提出的模型判定准确率达89.9%,可以为堰塞坝应急处理提供参考。小岗剑(上)堰塞坝判定为不稳定,需及时采取泄流措施避免灾害损失。
In order to quantitatively evaluate the stability of landslide dams quickly, the length, width, height, backwater length and reservoir capacity of the dam were selected as the evaluation factors of the stability of landslide dams through the analysis of historical cases and correlation analysis. Then the principal component analysis was carried out to choose the most influential factors. Evaluation factors are combined according to the size and weight of the principal component to get five composite factors as dam height factor, height-width ratio, flow impact coefficient, lake surface shape factor and dam body shape factor. On this basis, a rapid assessment model for quantitative analysis of dam stability is proposed. Besides, stability coefficient is introduced to reflect and classify the degree of the stability of dam. This model is applied to the evaluation of Xiaogangjian(upper) landslide dam which is formed in Wenchuan Earthquake. Results indicate that the accuracy of the model proposed is 89.9%, which can provide a reference for the emergency treatment of the landslide dams. The result shows that Xiaogangjian(upper) landslide dam is unstable, so quick discharge is necessary to avoid disaster losses.
作者
石振明
程世誉
张清照
薛丹璇
SHI Zhenming;CHENG Shiyu;ZHANG Qingzhao;XUE Danxuan(Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China;Ministry of Education Key Laboratory of Geotechnical and Underground Engineering,Tongji University,Shanghai 200092,China;North China Municipal Engineering Design&Research Institute Co.,Ltd.,Tianjin 300110,China)
出处
《水利与建筑工程学报》
2020年第2期95-100,146,共7页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金项目(41731283)。
关键词
堰塞坝溃决
快速评估模型
稳定性系数
landslide dam breach
assessment model
stability coefficient
