Deep Mining and Rockburst Research Institute,China Coal Research Institute
State Key Laboratory of Coal Mining and CleanUtilization
Coal Mining Research Institute Co.,Ltd.,China Coal Technology & Engineering Group
Shaanxi Coal and Chemical Industry Group Co.,Ltd.

Hard roof is a superior energy storage body but can easily induce rockburst as it releases a large amount ofelastic energy when breaking. Taking the central roadway of the Mengcun coal mine in Shaanxi as the research objectand considering its geological occurrence characteristics,coal seam physical mechanical properties,roadway spatial re⁃lationship and in⁃situ stress occurrence characteristics,it is found that its high ground stress occurrence,strong im⁃pact tendency,stress concentration caused by multi roadway arrangement,and overlying hard roof that is prone to storeenergy are the main factors leading to the frequent occurrence of rock burst in the central roadway. Based on this,the roof strip weakening method is proposed to create a strip weakening range parallel to the axis of the roadway along thebedding direction to prevent the roadway rockburst. According to the mechanical model and analysis, it isdemonstrated that the method can effectively reduce energy storage,increase energy dissipation and local structure ad⁃justment. Additionally,the ultra⁃long hole hydraulic fracturing technique is used to form the weakening area of the roofstrip in the hard roof in the central roadway. By employing the SOS microseismic monitoring system,the energy leveland appearance characteristics of microseismic events in a certain area before and after the measures are compared.The results show that there are no occurrence of microseismic events with energy greater than 104 J in the monitoringarea,and the energy of other magnitudes also decreases significantly,the energy concentration zone changes corre⁃spondingly. These results demonstrate that the roof strip weakening method can effectively contain the potential ofrockburst,and provide a new technical means for roadway rockburst prevention.