摘要
By the microseismic (MS) monitoring system of Sanhejian Coal Mine,the detail MS activity rules in the entire mining process of 9202 strong rockburst working face were studied,following main conclusions were obtained.(1) The strong correlation between MS activity and the region stress gradient was revealed.The higher the region stress gradient, the stronger the MS signal is,and the frequency-spectrum moves to lower frequency band the amplitude begins to add gradually.(2) The different types of MS signals have the cor- responding frequency-spectrum character.Such as relieve-shot MS signal shows the wide frequency-spectrum,multi-peak high frequency character,while rockburst omen signal shows the low frequency and amplitude,the mainshock signal has relatively higher fre- quency and amplitude.(3) To monitor and recognize rockburst dangerous region,the strong consistence between the MS signal intensity and the amplitude of electromagnetic emission (EME) signal and drilling bits measured was observed.On above,the weakening and controlling technology of MS intensity was put forward.
By the microseismic （MS） monitoring system of Sanhejian Coal Mine, the detail MS activity rules in the entire mining process of 9202 strong rockburst working face were studied, following main conclusions were obtained. （1） The strong correlation between MS activity and the region stress gradient was revealed. The higher the region stress gradient, the stronger the MS signal is, and the frequency-spectrum moves to lower frequency band the amplitude begins to add gradually. （2） The different types of MS signals have the corresponding frequency-spectrum character. Such as relieve-shot MS signal shows the wide frequency-spectrum, multi-peak high frequency character, while rockburst omen signal shows the low frequency and amplitude, the mainshock signal has relatively higher frequency and amplitude. （3） To monitor and recognize rockburst dangerous region, the strong consistence between the MS signal intensity and the amplitude of electromagnetic emission （EME） signal and drilling bits measured was observed. On above, the weakening and controlling technology of MS intensity was put forward.
基金
the National Key Project of Scientific and Technical Supporting Programs(2006BAK04B02,2006BAK03B06)
