Abstract：Using the experimental system for collecting the charge-induced signal of coal and rock，the research is made on the characteristic of charge induction during the deformation and fracture process of coal and rock. Using the self-designed charge-induced instrument，field test is done in coal mine. The experimental results show that the charge-induced signal generates during the deformation and fracture of coal and sandstone. The higher the stress in the coal or rock is，the stronger the deformation and the failure are，and the stronger the charge-induced signal is. The strongest charge-induced signal generated near the peak stress of coal or rock and the strong signal generated when coal damage. The higher compressive strength of the coal is，the stronger the charge-induced signal is and the longer the signal duration is. 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. Field practice shows that there is a certain relationship of the charge induction value and the stress in the coal. The charge-induced amplitude is small in the stable period in the face，but the amplitude is large in the event of impact. The impact danger can be predicted by the charge induction method，but still the charge induction method is at an experimental stage. Charge induction forecasting techniques also need to continuously be validated and improved in the field. The reliable technical support is provided for the non-contact forecast to the mine dynamic disaster.
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2012, Vol. 31 
