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MULTI_SCALE ANALYSIS OF GEOTECHNICAL DEFORMATION MONITORING SIGNALS BY TIME DOMAIN REFLECTOMETRY BASED ON WAVELET TRANSFORM
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摘要: 为更加充分、准确、高效地利用TDR法岩土体变形监测过程中实时得到的同轴电缆反射信号,提出以Haar小波变换对该信号进行多尺度分析,利用大尺度下细节信号特征识别后期岩土体变形失稳发生区域,并将其应用于两个工程实例中。结果表明:运用小波变换分析电缆反射信号不仅能从岩土体变形初期TDR测试仪接收信号中较为准确地突显后期导致岩土体失稳的剪切变形区域或位置,而且可以通过多个不同时点原始信号小波分析结果的对比,直观地获知岩土体内部相应时段内发生运动变形的区域。因此,运用该方法可充分挖掘同轴电缆反射信号中内含的岩土体变形信息,对有效实现岩土体早期变形失稳预警具有积极的意义。Abstract: In order to study the reflected signal in coaxial cable of time domain reflectometry deformation monitoring fully,accurately and efficiently,it is proposed to use Haar wavelet transform for analyzing these reflected signals and to distinguish instability region in soil and rock according to detail signal of large scale.Two engineering cases show that the shear deformation region giving rise to instability of soil and rock can be visualized highlightly by this method and the area deforming in certain time interval can be observed directly through contrasting the results of wavelet analysis received in correspondence time interval.So,this method has positive significance to realize early warning of excessive deformation of soil and rock effectively.
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