Application of well-hole combined micro-seismic technique in working face monitoring

Abstract

Based on the mining process of 11916 working face in east well of Gequan Mine, Hebei province, the failure depth of 11916 working face and water-conducting crack in floor were monitored in real time by using well-hole combined micro-seismic monitoring technology. The method of firing calibration gun was used to calibrate the positioning parameters and verify the positioning accuracy, so as to ensure that the positioning accuracy of the micro-seismic monitoring system could meet the requirements, and the stoping length of the working face was 1 000 m during the monitoring period. The monitoring results show that in the stoping process of 11916 working face, the damage depth of the floor is within 20 m below the floor, and the fracture height of the roof is within 100 m above the roof. The monitoring results are basically consistent with other monitoring results of the mine. The results show that the combined well-hole micro-seismic technology can detect the depth of floor failure and the height of roof crack development.

Keywords

• well-bore combination
• micro-seismic
• real-time monitoring
• damage depth
• height of fracture development