| Rock burst is one of the worst natural disasters in worldwide coal mine,forecast for it and take timely measures to prevent the regional and local risk is very important, charge induction signal change features predicts percussive ground pressure is a feasible method。The rules and influence factors of coal rock deformation process charge induction signal in indoor experiment and field test is studied in this paper。Experiment system of charge induction coal and rock deformation signal under Uniaxial Compression is established,and signal characteristics and the changing laws in different types of coal and rock in the same loading rate under charge induction is studied; signal characteristics and the changing laws in the same type coal and rock under different loading rate under charge induction is studied; the relationship of coal rock mass deformation process charge induction signal and compressive strength relationship is studied. It is shown that charge induction signal increased with enlarged loading rate in different loading rate and different types of coal and rock;amplitude of charge induction signal increased with enlarged ultimate stress in same loading rate and different types of coal and rock.Experiment system of charge induction signal influenced with temperature is established,and signal characteristics and the changing laws of coal and rock with change of temperature is studied. The results indicate that charge induction signal increased with enhanced temperature, and environmental temperature has almost no influence to charge induction signal predicts rock burst.Experiment system of charge induction signal influenced with coal rock friction is established, and signal characteristics and the changing laws in the process of coal and rock by friction is studied, and obtained charge induction signal and coal rock properties have larger relationship by friction in the process of coal and rock, the coal rock harder, the charge induction signal value in friction is higher.The experimental results demonstrate that the main mechanism of coal and rock charge generation is the coal rock particle, mineral particles and cementation things happen between sliding, fault dislocation, for the friction and produce charge in the process of coal rock being loaded.The information of coal rock charge induction signal reflects the main factors influenced rock burst comprehensively, The amplitude of charge induction signal reflects the level of coal and rock loaded and deformed. Using coal rock charge induction signal to assess and predict rock burst risk is feasible and efficiently, the monitoring results can determine the regional location rock bursts occurred in, it provided scientific basis for us to take corresponding and effective prevention measures. |
PDF Full Text Request