Abstract: Large deformation accidents occur frequently in deep inclined strata roadways.In order to study the deformation and failure characteristics and mechanism of surrounding rock in 45 degree inclined strata,FLAC3D numerical simulation method is used to study the deformation and failure process of the surrounding rock in the 45-degree inclined strata.Distribution characteristics of displacement field,stress field and plastic zone of surrounding rock in this type of roadway are obtained.The obtained roadway deformation trend is consistent with the project site results.It is concluded that the deformation of the roadway will cause a certain range of rock stratum sliding; the unconformity of the normal deformation of the rock stratum near the roadway will lead to the bending and shearing of the rock stratum.The subsequent formation of the mobile structure is the direct cause of roadway deformation and instability.Through this study,the deformation and failure law of surrounding rock in inclined rock stratum roadway is obtained,which can provide reference for roadway support of similar projects.

Key words: 45°, inclined rock, Surrounding rock deformation, FLAC3D numerical simulation