Research on the correlation between crustal deformation characteristics and impact geopressure in Hegang Mining Area based on INSAR monitoring

Rock burst is the result of the coupling effect of geological dynamic environment and mining engineering disturbance. The crustal deformation characteristics of mining area are one of the important influencing factors of geological dynamic environment, which can directly reflect the dynamic evolution characteristics of stress deformation-instability of overlying coal and rock mass structure in underground working face mining. The disturbance of mining engineering increases the stress of coal and rock mass and accumulates energy. When the critical condition of coal and rock is reached, it is easy to induce the instantaneous release of energy and cause the disaster of rock burst. Therefore, there is a close relationship between the regional crustal deformation characteristics and rock burst in the mining area. In order to deeply analyze the relationship between the crustal deformation characteristics and the micro-seismic energy events of rock burst in the mining area, based on the InSAR monitoring data of Hegang mining area, the temporal and spatial evolution characteristics of surface deformation in Fuli coal mine, Xing’an coal mine and Junde coal mine were studied. Taking the second section of the working face of the 17-layer three-four area of Junde coal mine as an example, the InSAR monitoring results of 10 points in the region were selected, and the average crustal deformation characteristics and the total energy of rock burst micro-seismic were comprehensively analyzed, and the “time-space-strong” characteristics of the occurrence of high-energy micro-seismic events and regional crustal deformation were quantitatively determined. The research shows that the vertical deformation of the crust in the mine field of Junde Coal Mine is consistent with the total energy change trend of the 17-layer microseismic events, reaching 69%, and there is a high consistency in time frequency. The energy of 24 large-energy microseismic events in the typical period (2020−12−02—2021−12−28) and the average deformation of 10 monitoring points were selected for Pearson correlation analysis. It was concluded that the magnitude of microseismic energy was positively correlated with the average deformation, and the correlation coefficient was 0.56. The epicentral distance was negatively correlated with the average deformation, and the correlation coefficient was −0.75, which reflected the spatial and intensity relationship between crustal deformation characteristics and rock burst. It shows that InSAR monitoring has a high degree of matching with microseismic events in time, space, deformation and microseismic monitoring.