Present situation and problems of coal mine rock burst prevention and control in China

With the increase of mining depth and intensity of coal mining,the number of rock burst mines and risk degree of rock burst increase significantly in China. Due to more attention paid to rock burst hazard,a series of important progress has been made in the field of prevention and control of rock burst,and the rock burst related accidents can be controlled in most of the rock burst mines in China. Based on the valuable research achievements of rock burst,this paper presents a comprehensive overview of the research progress and development trends of rock burst in terms of regulation construction,occurrence mechanism,monitoring and early warning of rock burst,and identifies the challenges of rock burst prevention and control in the future. In terms of regulations and standards,a system of regulations centered on the Coal Mine Safety Regulations and Rules for Prevention and Control of Rock Bursts in Coal Mines has been formed. The regulations have been continuously improved towards their concretization and standardization. In terms of occurrence mechanism of rock burst,multiple mechanisms such as “three factor” theory,dynamic and static combined load inducing rock burst theory coexist,which describe the disaster causing process of rock burst from multiple perspectives,showing diversified development trend. In terms of the prediction and forecast of rock burst,a composite prediction and warning system,which integrates multiple factors,multiple systems and multiple precursor indexes,has been developed,and the warning efficiency has been improved continuously. In terms of roadway support of rock burst mines,the three level supporting theory system has been established,which enhances the roadway stability and the ability of resistance to dynamic load disturbance. In terms of the management of personnel limit in rock burst mines,intelligent personnel limit has been realized. In terms of rock burst prevention and control,a technical system combining regional prevention and local disaster control has been derived,and the disaster prevention and control capacity has been continuously improved. At present,China has established a relatively sophisticated theory and technology system of rock burst prevention and control,and some remarkable prevention effects of rock burst has been achieved. However,due to the vibration,instantaneousness,complexity and unpredictability of rock burst,there are still some problems such as vague relationship between mine tremors and rock burst,uncertainty in the rock burst risk prediction methods,and low accuracy of the monitoring methods remains to be solved.