摘要
The coal rock charge induction test system under the condition of uniaxial compression is established by use of the self-developed charge induction instrument.And the charge induction laws under different loading rate of coal,granite,sandstone are researched.The experiment results show that the maximum value of coal rock charge induction appears before the stress reaches its peak,and with the increase of loading rate,the time of maximum charge value preceding the strength limit tends to be shorter.The maximum value of coal rock charge induction differs greatly among the coal rock of different properties.The maximum value of granite charge is greater than that of coal charge,and maximum value of coal charge is greater than that of sandstone.Weak charge signals are generated when the stress is small;when the stress reaches about 90% of the ultimate stress of coal rock a large amount of charge signals are generated,it illustrates that stress threshold exists in the coal rock charge induction.So the charge induction method is feasible for the forecast of dynamic disaster and it worth to be researched deeply.
