|
Abstract Taking No.1605 return airway of Guhanshan Mine as the research object, the fracture line position of overlying main roof strata was obtained by theoretical calculation, and the reasonable width range of coal pillar was determined. A large three-dimensional numerical model was established to study the distribution of deviatoric stress and plastic zone of roadway surrounding rock at different positions of advanced working face during mining, and the reinforcement range of advanced working face was determined. The plasticization degree and deviatoric stress distribution characteristics of the roof, solid coal and coal pillar side of the gob-side roadway after the mining stability of the working face were obtained, and the failure mechanism of the surrounding rock of the gob-side roadway in the deep thick coal seam was revealed. The comprehensive control technology of the surrounding rock of ' long and short anchor cables in the roadway side with solid side + roof bolt with long and short anchor cables combined with roof control ' was put forward, which made the deformation of the surrounding rock of the roadway within the safety limit.
|
