Abstract: In view of the non-conformity of discontinuous structure of surrounding rock of deep half coal rock roadway and deformation, taking the specific engineering geological conditions of a coal mine 92105 working face in the half coal rock roadway as background, Abaqus software has been used to build the half coal rock extraction roadway model, study the stress, displacement and plastic zone distribution under the main controlling factors such as different coal and rock interface position and coal rock interface dip, and reveal the mechanism of deformation and failure of surrounding rock of deep soft rock roadway. It shows that the large deformation occurs in the tunnel in coal seam at the position of the side seam location; with the increase of the coal seam inclination, the concentration area of the principal stress difference gradually shift to the roadway's sides, which causes the decrease of the overall deformation of roadway, and the large deformation only appears in the coal seam location. In response to the asymmetric deformation and failure characteristics of half coal crag tunnel surrounding rock, the asymmetric coupling support countermeasure in key parts has been put forward, and the results show that: this support countermeasure can effectively control the non-conformity of the rock deformation failure in half coal rock roadway, guaranteeing the stability of the roadway surrounding rock.

Key words: half coal rock roadway, non-continuity, failure mechanism, Abaqus