Mechanism study on compound disaster of rock burst and gas outburst

In order to study the compound disaster of rock burst and gas outburst in high gas coal seam, taking the circular section roadway of high gas coal seam as an example, and the transportation roadway of high gas thick coal seam in Fuxin Hengda Coal Mine as the engineering background, the occurrence conditions of the compound disaster of rock burst and gas outburst were obtained by analytical analysis, andthe influence of relevant factors on the radius of critical plastic zone and critical load was analyzed.The results show that the radius of critical plastic zone increases with the increase of modulus ratio, decreases with the increase of Poisson ratio, decreases with the increase of dilation angle and decreases with the increase of internal friction angle; the critical load increases with increaseof modulus ratio, decrease with increase Poisson’s ratio and dilation angle, and increases with increaseof internal friction angle,linear increase with increase cohesion, effective stress coefficient, support resistance coefficient,and original gas pressure,and linearly decreases with the increase of gas pressure on the inner wall of the roadway,and increases with the increase of gas pressure difference.