基于经验模式分解和相空间重构的采空区地表动态变形混沌性态及时变规律研究

Law of time-dependent deformation and chaos characteristics of goaf surface based on empirical mode decomposition and phase space reconstruction technique

采空区地表动态变化过程受到诸多地质及采矿条件的影响,为研究其细部动态变形过程,结合某矿区地表变形的动态监测资料,基于经验模式分解(EMD)信息提取技术提取地表变形趋势信息能力和相空间重构技术的数据处理特点,提出了地表动态时变规律分析方法:利用EMD技术,提取出地表的时效变形;采用相空间重构技术对时效变形重构相平面,研究地表随时间的沉降演变规律。结果表明,应用该方法可以清晰地分析出地表随时间变化过程中细部动力学过程,得出地表变形的时变规律。

surface dynamic deformation of goaf surface is effected by a series of geological and mining conditions;in order to study the details of the process of dynamic deformation,based on information extraction technologies of the empirical mode decomposition（EMD） and phase space reconstruction technologies,and using the data of surface deformation monitored,the laws of surface deformation of dynamic time-varying are put forward.First,the EMD technology was applied to extract the law of the time-dependent deformations of goaf surface;then the phase planes of goaf surface are constructed by using phase space reconstruction technique for studying the evolution of surface deformation.The practice shows that the variation of time-dependent deformation of goaf deformation can be clearly found out by using the above method.