摘要
探索土石坝形变规律及稳定性分析是全球水利工程所关注的一个重大问题,对保障人民群众生命安全和经济健康发展具有重大意义。采用2017年3月至2021年9月小浪底土石坝55景Sentinel-1A卫星SAR影像,利用PS-InSAR技术,监测到小浪底土石坝近5年从坝顶至坝底呈现“阶梯状”形变趋势,最大形变量达到-86.09 mm;并结合库水位、降雨量等因素,发现坝体整体呈现“夏急冬缓”的季节性形变趋势。进一步采用二维有限元方法,对小浪底土石坝的模拟模型进行渗流、应力分析。在高库水位情况下,相较于低水位情况,坝体渗流量更大、形变速率更大;在应力分析部分,发现坝体的垂直向形变趋势与InSAR监测结果相吻合,亦呈现“阶梯状”形变。研究成果不仅为小浪底土石坝运行稳定性分析及形变历史回溯提供理论基础和决策依据,也说明PS-InSAR技术与二维有限元模型模拟技术在水利工程监测方面具有巨大的应用潜力。
Exploring the law of deformation of soil and rock dams and analyzing the stability is a major issue of concern for a large number of water conservancy projects worldwide,which is of great significance to ensure the safety of people′s lives and the healthy economic development.Using 55 Sentinel-1A satellite SAR images of Xiaolangdi soil and rock dam from March 2017 to September 2021,and PS-InSAR technology,it was detected that Xiaolangdi soil and rock dam showed a ″stepped″ deformation trend from the top of the dam to the bottom of the dam in the past 5 years,and the maximum deformation amounted to-86.09 mm.Combined with the reservoir water level,rainfall and other factors,it is found that the dam body as a whole shows a seasonal deformation trend of ″rapid in summer and slow in winter″.The simulation model of Xiaolangdi soil and rock dam was further analyzed for seepage and stress using two-dimensional finite element method.In the case of high reservoir water level,the seepage flow and deformation rate of the dam body are larger than that of low reservoir water level.In the stress analysis part,it is found that the vertical deformation trend of the dam body is consistent with the InSAR monitoring results,and the deformation also presents a ″stepped″ shape.The research results provide theoretical basis and decision-making basis for the operation stability analysis and deformation history tracing of Xiaolangdi soil and rock dam.It shows that PS-InSAR technology combined with 2D finite element model simulation has great potential for application in water conservancy project monitoring.
作者
刘辉
朱梦源
赵文飞
李葛爽
周泊辰
LIU Hui;ZHU Mengyuan;ZHAO Wenfei;LI Geshuang;ZHOU Bochen(College of Surveying and Geo-informatics,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Hebei Institute of Investigation&Design of Water Conservancy&Hydropower Group Co.,Ltd.,Tianjin 300250,China;Henan College of Surveying and Mapping,Zhengzhou 450015,China)
出处
《华北水利水电大学学报（自然科学版）》
北大核心
2024年第1期1-10,共10页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
国家自然科学基金项目(41901411)
河南省重点研发与推广专项(科技攻关)(212102310052)
河南省高等学校青年骨干教师培养计划项目(2021GGJS073)
河南省青年人才托举工程(2020HYTP010)
智慧中原地理信息技术河南省协同创新中心和时空感知与智能处理自然资源部重点实验室基金资助项目(211103)
河南省空间信息生态环境保护应用重点实验室开放课题(22-FW-07-0107)。
关键词
PS-INSAR
土石坝
形变监测
稳定性分析
库水位
PS-InSAR
soil and rock dam
deformation monitoring
stability analysis
reservoir water level
