A Study of Rock Burst Hazard Prevention Method |
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| Authors: | Xiangxi Meng Weitao Liu Hui Zhang |
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| Institution: | 1.Shandong University of Science and Technology,Qingdao,China;2.Yan zhou Coal Group Co. Ltd,Jining,China |
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| Abstract: | In order to determine the rock mechanics characteristics, a uniaxial compression experiment for the hard sandstone in the 6305 working face of Jining No.3 Coal Mine was designed. The experimental results show that the bending energy is weakly impacted and the bending energy index is 66 kJ. To crack into the hard roof to prevent roof formation of rock burst with the Polish hydraulic fracturing technology. According to on-site hydraulic fracturing test, hydraulic fracturing radius of 6305 working face can reach 5–15 m. Finally, there is a little vibration, and energy is mainly concentrated range from 1000 to 10,000 J from the characteristics of mine waveform and spectrum distribution through microseismic monitoring system during the fracturing process. It shows that some microseismic events induced by hard roof after hydraulic fracturing have achieved the purpose of slow relief of hard roof and prevent the occurrence of rock burst. |
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