Research on Coal and Gas Outburst Prediction by Electromagnetic Emission (EME) Method Based on the Coupling Between EME and Stress

摘要

According to the relationship between EME signal and loading stress during deformation and fracture of coal or rock, the concept of the coupling between EME and stress during the deformation and fracture of rock or coal is given in this paper firstly. Then based on the laboratory experiments, theoretical analysis and numerical simulation methods, the EME method for the prediction of rock or coal outburst in light of the coupling between EME and stress is researched in this paper. The research results show that: the coupling method between EME and stress can correctly simulate the distribution rules of EME signal in coal or rock stratum. The EME signals are mostly come from the stress concentrating area. The changing of EME intensity reflects the changing of inner stress after excavation. The practical measured results of EME have the same changing tendency as the simulated results, which also testify the feasibility of the coupling method. It is offered a kind of new research approach to electromagnetic emission monitoring technology for the purpose of the application of monitoring EME in the prediction of dynamical catastrophes phenomena such as coal and gas outburst. It has important meaning for perfecting the EME monitoring and detecting theory and promoting the related disciplines. Finally this paper gives a prospect for the research on the EME method for rock or coal outburst prediction in the future.