Abstract:In order to explore the deformation and instability characteristics of the surrounding rock in the large mining height mining roadway, through the 3DEC numerical simulation software, with the 22204 auxiliary transportation roadway as the background, the characteristics of cracks development, stress distribution, displacement distribution and plastic zone distribution in the surrounding rock of the roadway are analyzed respectively. Results show that the cracks development and deformation of surrounding rock in large mining height roadway are asymmetric. As the working face advances, the displacements of the roadway continue to increase. Among them, the larger horizontal displacement is transferred to the middle and upper part of the roadway and the roof position, and the horizontal displacement of the roadway near the coal pillar side and the development of cracks are more significant; Under the influence of mining, the surrounding rock of the roadway undergoes a certain degree of shear failure, which leads to the release of the stress of the coal and rock mass. In addition, the coal pillar is in a state of high stress for a long time, so the plastic failure of the roadway side and roadway roof near the coal pillar is more serious and frequent. Based on this, the key prevention and control areas for surrounding rock deformation of large mining height mining roadways are defined, which provides a reference for the stability control of such roadways.
