Research On The Influence Of Different Sizes Of Coal Pillars On The Rock Burst Occurrence In 7302 Working Face Of Xinglongzhuang Coal Mine

Rock burst is a worldwide complex problem.In recent decades,with the increase of mining depth and mining intensity of coal mine in our country,the occurrence of rock burst is becoming more and more frequent.Due to geological conditions is complex,the stress situation is changing and the theory and technology is not perfect,it is necessary to conduct a systematic and in-depth study on the prediction of rock burst.In this paper,the influence of different sizes of coal pillars on rock burst in the 7302 working face of Xinglongzhuang coal mine are studied by means of empirical analogy,theoretical analysis,numerical simulation and field monitoring.In this paper,the methods of empirical analysis and theoretical analysis are used to analyze strata behavior regularity in 7301 working face and 7303 working face adjacent to 7302 working face and microseismic regularity of 7303 working face,and the conditions for the occurrence of rock burst are analyzed.Coal seam and its roof have impact tendency is determined by using theoretical analysis and mechanial calculation,the simulation of working face mining process is carried out by means of computational simulation for analyzing the distribution and evolution regularity of the internal stress in single side and two side of coal pillar.The maximum stress of the single side mining is 45MPa,the stress will be reduced to 38.2MPa when the stress is released in the single working face mining,but the coal pillar is still stable.When the two sides mining were finally pushed into formatting 20m coal pillar,the stress superposition rapidly and the stress increased sharply to 65 MPa.Based on the above factors,the occurrence condition of rock burst is analyzed,then use the comprehensive index method,"three conditions" method,etc.multi factors are apply to analyze,finally forecast 7302 working face belongs to medium impact risk,according to geological conditions and mining technical condition,the rock burst prediction and control scheme is designed.Study on the influence of different size of the coal pillar on rock burst,it is of guiding significance to set fault coal pillar coal mine and provide technical support for coal mining seam in geological condition similar to Xinglongzhunag,at the same time,it lays a certain foundation for research of coal pillar setting in coal seam mining of rock burst under the same situation.