Study On The Charge Induction Rules During Deformation And Fracture Of Coal Or Rock

Rockburst, a serious natural disaster, is considered as a dynamic destabilization phenomenon of the rock mass in mining activities. The research history of rockburst nearly has been 100 years in China and abroad, however it still hasn't been preferably solved. China is one of the countries where rockbursts are serious, which makes it an urgent task to research into the monitoring technique of rockburst. The deformation and fracture mechanism of coal or rock is studied. The charge induction instrument which includes the charge sensor and data collector's hardware & software is independently developed. The rule of charge induction during the rock and coal deformation and failure is researched by combining experimental study with theoretical analysis. Based on the experimental results and the mechanisms of coal or rock deformation and fracture, the mechanism of charge induction during coal or rock deformation and fracture is analyzed and studied. With the self-designed charge induction instrument, the mine dynamic phenomenon is predicted.The results indicate that the charge induction instrument has been able to monitor the produced charge of coal or rock deformation and fracture. There is the charge in the process of coal or rock deformation and fracture. The charge induction signal priors to the occurrence of magnetic signals during the coal or rock deformation and fracture. Charge induction signals and acoustic emission signals are not fully synchronized. Charge induction and acoustic emission aren't homologous radiation, and there isn't identical generation mechanism between them. The charge induction signal is relation to the compressive strength, the structure and the loading method of coal rock mass. The charge induction signals on all sides aren't in the same step, and their magnitude is different. Sudden loading and unloading, there will be charge induction signal generation, but the signal intensity is very small, the strongest signal is emerged at the time of fracture. The deformation and fracture process of non-homogeneous coal or rock is not continuous process, is paroxysmal. The charge induction signal is not continuous, paroxysmal too. Our result suggests that the charge production during the process of coal or rock deformation and fracture is relation to the deformation and fracture of coal or rock. The generated mechanism of the charge includes piezoelectric effect, friction, crack-tip charge separation because of micro-rupture, dislocation theory, and electro-kinetic effect in the process of coal or rock deformation and fracture. But the primary principles of charge generation in the process of coal or rock deformation and fracture are friction and crack-tip charge separation because of micro-rupture. The application of the technology of charge induction in the prediction of catastrophic dynamic phenomena is feasible.The method of the charge induction should be a very potential method to exploring the rock failure process and predicting catastrophic dynamic phenomena, it is worth to studying.