Abstract:
In order to solve difficult support problems of gob-side entry driving in deep high stress disturbance of surrounding rock, an example of the fourth mining area auxiliary track tunnel in -808 m of Guotun Coal Mine is presented, through analyzing the roadway surrounding rock deformation and failure characteristics and influencing factors of the deformation, the “the high strength and high pretension yieldable bolt + anchor + metal mesh + ladder” of asymmetric network and cable support scheme is proposed to optimize the supporting ways and supporting parameters. By using the finite difference software FLAC
3D, the numerical simulation is carried out for gob-side entry driving in the deep high stress disturbance surrounding rock. The stress of the surrounding rock is significantly lower than that of the original scheme, and the deformation of top and floor and the two walls are effectively controlled. The field application and observation results show that the stress distribution of the surrounding rock of the tunnel is better than that of the non-symmetrical anchor net.