Study on the correlation between crustal deformation characteristics and rock burst in Hegang mining area based on...

Rock bursts are devastating hazards induced by the coupling of geological dynamic environments and mining-induced disturbances, which trigger a sudden release of energy when accumulated elastic strain exceeds the strength threshold of rock masses.As one of the key characterization parameters of the geological dynamic environment, the crustal deformation characteristics of the mining area can effectively reveal the dynamic evolution law of the overlying coal and rock mass structure from stress deformation to instability failure during the mining process of the underground working face.Based on the GNSS monitoring data of Junde mining area, through the analysis of the crustal deformation characteristics of Junde coal mine, it is determined that the crustal deformation of Junde coal mine area shows a trend of extrusion to the southeast as a whole, and its horizontal movement direction is consistent with the overall movement direction of the region as a whole, showing SEE direction, with an average movement rate of about 30 mm / a ; By comparing the vertical time series of 3 # station with the time series of energy events, most of the time periods show the phenomenon of rising and falling at the same time. It is determined that when the energy background value is high (exceeding 100 events/day), if the GNSS station exhibits a rapid vertical subsidence reaching 30 mm, the Junde Coal Mine faces a significantly increased probability of large-energy events. Through the analysis of the influence of the epicentral distance of the earthquake on the vertical movement of the crust and the characteristics of energy events, it is determined that the vertical rapid decline of GNSS stations is related to the epicentral distance. The farther the epicentral distance, the greater the rapid decline of GNSS stations before the occurrence of large energy events of the same magnitude.