Study on Failure Features of Surrounding Rock in Mine Gateway Under Different Horizontal Stress

In order to control the failure features of the surrounding rock in mine gateway under different horizontal stress, a simulation test method with similar mat erial was applied to study the deformation and failure features of the gateway surrounding rock in a bolt I steel mesh 1 anchor 1 shotcreting + U type steel support gatew ay under different horizontal stress. The results showed that with the horizontal stress increased, the gateway deformation was firstly occurred in the arch abutment and floor corner, the cracking of the surrounding rock had an occurrence-expanding-breakthrough process and a failure degree of the gateway sidewalls was lower than the failure degree of the roof and floor. When a side pressure coefficient was 1. 6 and a horizontal stress was 28. 0 MPa, a sliding shear failure was occurred in the floor of the mine gateway and the obvious deformation occurred on the U type steel support. When the side pressure cofficient was 2.2 and the horizontal stress was 38.5 M Pa, the deformation value of mine gateway would be the max 120 mm.