Combined Detection of Collapse Columns through In-seam Wave Velocity Tomography and Wavelet Analysis

摘要

Some collapse columns have nearly the same wave impedance as the surrounding coal rock,and are hard to be detected by conventional methods.Using high accuracy AART algorithm to compute the group velocity of Airy phase,in-seam wave tomography has the ability to detect this kind of collapse column anomaly.Wavelet analysis can decompose in-seam wave signal into multi-scale signals,and under proper scale,the edge of collapse column can be detected.In this paper,in-seam wave tomography and wavelet analysis are used together to detect collapse columns,and the detection result on real data is very good.