Application and analysis of seismic frequency resonance technology of hydraulic fracturing monitoring in roof of coal seam

Carrying out hydraulic fracturing engineering on the hard roof of coal seams has gradually become a green, safe and efficient technical means of mine tremors prevention and control. In order to evaluate actual effect of hydraulic fracturing more accurately, this paper uses seismic frequency resonance technology to detect the fracture space distribution of high hard roof before and after fracturing by taking the fracturing monitoring of the 63 upper 03 working face of Dongtan Coal Mine as the engineering background. The application results show that seismic frequency resonance technology can present an obvious low impedance zone on the interpretation section for the fracture zone formed after the hydraulic fracturing task, and the spatial extension direction of the fracture zone is shown through the gridded detection corridor, which is basically consistent with the maximum horizontal principal stress direction of the mining area. At the same time, by comparing the numerical differences of low-wave impedance bands, it can be further subdivided into fracture bands with water conduction function and microfracture bands without water conduction function. This engineering application shows that the seismic frequency resonance technology proves the technical feasibility of monitoring the wave impedance change caused by the fracture zone in the overlying layer, which is an innovative and effective geophysical detection method, and the research results can provide a reference for hydraulic fracturing in mines under similar conditions for mine seismic disaster prevention and control.