大坝变形实测数据的多重分形特征解析方法  

Multifractal feature analysis method for measured data of dam deformation

作　　者：周兰庭[1] 柳志坤 ZHOU Lanting;LIU Zhikun(College of Water Conservancy and Hydraulic 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：《水利水电科技进展》2021年第6期18-24,共7页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51209078)。

摘　　要：为更好地分析大坝变形实测数据的波动特征进而评价变形的整体性态,以某混凝土重力坝的实测数据为凭,将多重分形理论应用于大坝变形性态分析中,利用MF-DFA、MV-MFDFA和A-MFDFA解析变形性态的多重分形特征及其非对称性。结果表明,无论是多测点或单测点,实测序列均具有明显的多重分形特征,并且这种多重分形特征具有明显的非对称特性;实测序列从多测点到单测点、从整体波动到局部趋势均表现出良好的记忆性和长程相关性特征,在水位等大波动因素的影响下,该坝坝顶水平位移发展良好,大坝整体状态稳定。In order to better analyze the fluctuation characteristics for the measured data of dam deformation,and then to evaluate the overall deformation behavior,the measured data of a concrete gravity dam was taken as an example.The multifractal theory was applied to the analysis of dam deformation behavior,and the multifractal characteristics and asymmetry of deformation behavior were analyzed by using MF-DFA,MV-MFDFA and A-MFDFA.The result shows that the measured data has obvious multifractal characteristics for both multiple measuring points or a single point,and the multifractal feature has obvious asymmetric characteristics.The measured data shows good memory and long-range correlation characteristics from multiple measuring points to single point,from overall fluctuation to local trend.Under the influence of large fluctuation factors such as water level,the horizontal displacement of the dam crest develops well and the overall state of the dam is stable.

关 键 词：大坝位移 多重分形理论 滑动时间窗 MF-DFA MV-MFDFA A-MFDFA 

分 类 号：TV53[水利工程—水利水电工程]