Abstract
In order to accurately identify the distribution of the karst water conduction channel after water inrush, the ground penetrating radar (GPR) is used for fine detection of development of karst water conduction in front of the heading surface after water inrush, and the instantaneous amplitude, instantaneous phase and instantaneous frequency are extracted from the radar signal by Hilbert transform. Then, the three instantaneous properties are combined for multi-parameter comprehensive analysis of the karst water conduction channel. As shown in the study results, the instantaneous amplitude can better show the boundary characteristics and morphological size of the karst water conduction channel. The instantaneous phase can clearly show the heterogeneous characteristics inside the karst water conduction channel. The instantaneous frequency can reflect the water richness of the karst water conduction channel from the angle of energy decay. The combination of the three instantaneous attributes can avoid the explanatory bias due to the analysis of single waveform characteristics, and effectively improve the resolution and accuracy of the detection of the karst water conduction channel.
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