分形-V/S法在大坝位移安全监测资料分析中的应用  

Application of Fractal V/S in Dam Displacement Safety Monitoring Data Analysis

作　　者：柳志坤 周兰庭[1] LIU Zhi-kun;ZHOU Lan-ting(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水电能源科学》2021年第5期97-101,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51209078)。

摘　　要：大坝位移受多种因素的影响,其监测序列往往呈现明显的非平稳性。对此,基于分形理论将V/S分析法应用到大坝位移序列的长程趋势性分析中,剖析了位移序列的分形特性及演变规律,并基于Hurst指数和分形维数定量表征测点时间序列的内在特征,据此评价大坝变形性态和安全状况,取得了较好效果。分析结果表明,位移序列虽然局部波动,但整体发展态势良好,且具有良好的记忆性和长程相关性,未来变化趋势将与过去保持一致,发展过程具有持久性,变形受确定性因素影响较大,变形以线弹性为主兼具随机性,测点位移状态基本稳定,并有朝稳定性方向发展的趋势。研究成果可为类似工程提供参考。Dam displacement was affected by many factors,and its monitoring sequence often presented obvious nonstationary.Based on the fractal theory,the V/S analysis method was applied to the long-range trend analysis of the dam displacement series,and the fractal characteristics and evolution law of the displacement series were analyzed.The intrinsic characteristics of time series of measuring points were quantitatively characterized by using Hurst index and fractal dimension.Therefore,the deformation behavior and safety status of the dam were evaluated accurately,and good results were achieved.The results show that although there are local fluctuations in the displacement series,the overall development trend is good,and has good memory and long-range correlation.The change of the future trend will be consistent with the past,and the development process will be durable.The displacement change is greatly affected by the deterministic factors,and the deformation is mainly linear elastic,accompanied by random characteristics.The displacement state of the measuring point is basically stable and tends to be stable.The research results can provide reference for the similar projects.

关 键 词：大坝位移 时间序列 分形理论 V/S 性态分析 安全评价 

分 类 号：TV698.1[水利工程—水利水电工程]