Fully-mechanized coalface periodic weighting analysis based on the SOS micro-seismic monitoring system

In order to effectively prevent the roof caving accidents occurs of the old roof weighting, the SOS microseism monitoring and measuring system was applied to the full time monitoring and measuring on the working face since the beginning of coalface mining start. Statistical analysis of micro earthquake events, incident frequency and event total energy periodic changes, thus deduce the old roof fracture periodicity. The results showed that coalface periodic weighting and event total energy periodic changing existence corresponding relationship. Before the strong micro-seismic activity occurred, there would be a weak seismic activity period and the weak seismic activity would play the role of energy accumulation to the strong seismic occurred. Releasing of the total energy in periodic weighting fluctuates in a certain range fluctuations, but the instability of fluctuation changes enhanced.