STABILITY ANALYSIS OF SURROUNDING ROCK IN THE OPERATION PROCESS OF GOB-SIDE ENTRY RETAINING IN MAIN ROADWAY UNDER COAL MINING ENVIRONMENT

The deformation and collapse of the roadway in the coal mining process affect the normal underground mining of coal, threaten the lives of underground workers, and damage the underground operating environment. Related research failed to carry out critical analysis and exploration on the stability laws and mechanisms of underground main lanes. Based on this, by considering the creep characteristics of the soft coal seam, the force status of the surrounding rock of the main roadway in the Cartesian coordinate system is analyzed. At the same time, the influence of creep on the stability of the surrounding rock of the main roadway is compared and researched, and the influence of the direction and stress characteristics of the main roadway on the deformation of the main roadway is explored. The research has found that neglecting the creep of the surrounding rock of the muddy soft coal seam will significantly underestimate the deformation of the surrounding rock of the main roadway. When considering the creep characteristics of the surrounding rock, the deformation of the roadway is 1.29 times that when the creep characteristics are neglected. In addition, research also found that the stability of the surrounding rock will be significantly worsened when the direction of the main roadway gradually changes from north-south to east-west. When the direction of the roadway is east-west, the longitudinal space of the roadway is compressed by more than 41.33%. Finally, the research believes that the greater the difference between the in-situ stress components, the greater the possibility of instability of the surrounding rock of the roadway. When the minimum horizontal principal stress changes from 5.00MPa to 3.45MPa, the maximum deformation of the roadway will increase from 1.37m to 1.74m.