Research On Assessment And Prevention Of Rock Burst About Mining Depth Of Coal Face Over One Kilometer In The No.3 Hongyang Coal Mine

With the increase of mining period,mining depth is increasing,geological conditions and mining conditions are becoming increasingly complex,and the threat of rock burst disaster is also increasing.Once the occurrence of rock burst will not only affect the mine production,and may cause equipment damage and casualties,is one of the major dynamic disasters in coal mine,it is necessary to discuss in depth and study systematically the risk assessment and control technology of rock burst.The main research object of this paper is 1206 working face of two mining area in the No.3 Hongyang coal mine,in this paper,the methods of numerical calculation,theoretical analysis and field monitoring are applied to study the burst risk assessment and control technology in Km deep 1206 working face.First of all,according to the geological data of 1206 working face,by setting up the calculation model,the lateral abutment pressure of working face is calculated by numerical calculation,the lateral abutment pressure distribution and its influence range are obtained in gob side coal.Secondly,using the method of theoretical analysis,considering enough rock burst influencing factors of 1206 working face,impact risk comprehensive index method and rock burst possibility index diagnosis method was used for macroscopic evaluation of rock burst,it shows that working face has the stress condition of rock burst and the strong impact risk.At the same time,the use of theoretical analysis and field test method for evaluation of multi factor coupling on impact risk of working face from many aspects including coal and rock structure,weight,geological structure and spatial structure of overlying strata,it is concluded that 1206 working face has great danger during mining period,and the impact danger areas are classified.Finally,the method of field monitoring combined with classify of dangerous area of working face is applied to discussed on prevent and control of rock burst in 1206 working face.According to the actual requirement of 1206 working face,the concrete protection measures are put forward for rock burst in 1206 working face.The research of this paper has practical guiding significance for prevention of rock burst in mining working face which is more than 1000m depth in No.3 Hongyang coal mine in future,it provides technical support for safe production of working face,and lays a foundation for the prevention and control of rock burst.