Periodic weighting judgment and rock burst danger control on fully mechanized top-coal caving face
In the process of fully mechanized caving of coal seam,the roof will be periodically weighted,which releases large energy vibration and induces shock behavior.Therefore,it is very important to accurately grasp the weighting law of the working face for the prevention and control of rock burst.In view of the large error in the analysis of the single method of pe-riodic weighting,a comprehensive determining method of"microseismic-support pressure-gas inrush"is proposed by analy-zing the microseismic monitoring indicators of"vibration frequency","source energy",change of gas emission amount,and the distribution cloud map of support pressure on the working face during the mining process.The method can precisely pre-dict the weighting cycle of the 250107-1 working face.We propose that adopting a combination of"roof failure-loosening"blasting to weaken the roof can effectively reduce the danger of rock burst.
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