Stability analysis of roadway surrounding rock considering the influence of structural plane

Aiming at the asymmetric failure phenomenon of inclined strata roadway, theoretical analysis and FLAC^3D numerical simulation method are used to study the bearing capacity and deformation and failure law of roadway under the influence of different strata dip angles and different positions of roadway, and the asymmetric deformation and failure mechanism of surrounding rock of inclined strata roadway is revealed. The results show that the bearing capacity of different positions around the roadway is different under the condition of different strata dip angles. The existence of structural plane reduces the stability of surrounding rock of roadway. When the shear stress at this position is greater than the shear strength, slip failure will occur. When the position of the roadway is fixed, there is the most unfavorable strata dip angle β_min. When the position of the structural plane coincides with β_min, the bearing capacity of the surrounding rock is the weakest, which is the most unfavorable to the stability of the roadway. Through the optimization of the roadway support scheme, the design of “anchor net + 36 U shed + anchor cable beam + grouting” composite support scheme is designed, and the deformation of surrounding rock is effectively controlled.