STUDY ON MINING-INDUCED MICROSEISMIC ACTIVITY AND ITS MONITORING METHOD IN THE HONGTOUSHAN COPPER MINE

摘要

Mining-induced seismicity is directly related to the interaction of mine excavations and geological structures with regional and local stress fields. In this paper, the ground pressure characteristics and hazards of deep ore bodies, especially rockburst etc, at the Hongtoushan copper mine in China are summarized briefly. The velocity of P- and S-waves in the rockmass were measured by using wave analyzing instruments. In order to obtain the activity rule of ground pressure, a six-channel microseismic monitoring system called Hyperion (including the 3-monodirectional and one tndirectional sensors) was established and employed to monitor the rockburst activity in the Hongtoushan copper mine. The microseismic monitoring technique is a good tool to detect the activity rule of ground pressure for deep bedding ore bodies, and it can monitor the occurring time and position of rockburst events in the stope continuously and in-real-time. By using a Simplex location algorithm, the microseismic event can be determined by AH sensors from first arrival times. Source location errors are tested by artificial blasts. The monitoring results show a locating error which is less than 5-10 meters within the sensors array and the perfect source locating performance of the system. The monitoring data can be transmitted far distances, and the source location figure is presented for analyzing the activity law of ground pressure (including the rockburst etc.). The monitoring results have been contributed to the prediction of the occurrence deposition of rockburst to guarantee safe production in Hongtoushan copper mine.