243 / 2018-07-27 08:21:41

Research on Electromagnetic Emission-Microseismicity Coupling Evaluation Method for Rockburst on Dynamic – Static Energy Principles

rockburst,energy principle,microseism,electromagnetic emission,coupling

矿山动力灾害 > 岩爆冲击

Field investigations and theoretical studies show that the dynamic damage of the coal and rock system is characterized by static-dynamic coupling loads. During the preparation and development of rockburst the electromagnetic emission can represent energy accumulation while microseismic events represent the output of energy which indicates microseismicity has a duality of energy release and dissipation. So it is unscientific if the electromagnetic emission strength which stands for the energy accumulation and microseism energy that presents energy release are separately used as the criterion for rock burst forecast. Based on energy principles the precursory rules of rock burst are studied in this paper combining with the electromagnetic emission and microseismic monitoring method, the coupling evaluation system was established based on the monitoring results of a specific rockburst colliery. The results show the precursory rules that the electromagnetic emission strength is much higher than normal and micro- seismic energy is continued lower as well as the activity number appears an increase tendency. Rockburst will hardly occur if the micro-seismic activities are on the steady energy release estate even though the electromagnetic emission strength is higher. The research outcomes also provide a foundation for the control and effect inspect of rock burst