A Positioning Method of the Partial Stretch of Spiral Parallel Cable

Abstract

How to identify the partial deformation position is an important issue in the use of the time domain reflection technique based on spiral parallel cables to monitor the hazards of landslide, debris flow and other geotechnical engineering. Hence, this paper presents a new method to identify the edge of partial tensile deformation of the spiral parallel cable. Firstly, the reflected voltage waveform of the spiral parallel cable is recorded before the partial tensile deformation, and then the reflected voltage waveform of the spiral parallel cable is recorded after partial tensile deformation. Subsequently, the waveform of the deformation is subtracted from the waveform before the deformation, and the difference waveform is obtained. Finally, the measurement blind zone in the difference waveform is removed. In that case, the minimum point of the remaining closed range corresponds to the left edge of the tensile deformation, the first extreme point behind the minimum point corresponds to the right edge of the tensile deformation.