急斜特厚煤岩体耦合致裂应用研究

doi:10.13722/j.cnki.jrme.2014.0791

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Abstract To better achieve fracturing effect in coal and make up for the shortcomings of blasting and water injection，a method of coupled cracking were put forward. The coupled cracking was applied to a steeply dipping and extra-thick coal layer. The caving ability(U) of coal after coupled cracking was forecasted with the method of BP neural network and the differences of U obtained with the different methods were compared. The effect of pressure relief in rock was analyzed with the method of microseismic monitoring. The coupled-cracking technology was found to be an effective to improve the caving ability and to relieve stress concentration for steeply dipping and extra-thick coal layer. The effect of coupled-cracking was evaluated with the analysis process of coupled cracking. The prediction with BP neural network still had a certain degree of reliability for the cross regional of high stage and conventional stage coal mass and the assessment of coupled cracking effect for coal mass was realized. The number of low level microseismic event rose slightly during the water injection and after water injection and blasting，but the energy caused by the decreasing of high level event was more than the energy of new low level event. The released energy after injection water was only 12.5% of the released energy before injection water. The total energy after the ground blasting was reduced by 51% compared with the energy before blasting. Coupled-cracking effect was manifested in the conversion of the small number of microseismic events of high energy into more events of low energy，which reduced the frequency and extent of dynamic disaster and promoted the slow release of high pressure. The coupled-cracking shifted the dynamic disasters to slow static release.

Key words： mining engineering steeply dipping and extra-thick coal-rock coupled cracking micro-seismic monitoring neural network

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.0791 OR http://www.rockmech.org/EN/Y2015/V34/I08/1569

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