Abstract: As a key channel in the downward drift mining,the reasonableness of the structural parameters of the layered roadway is a key factor to ensure operational safety and efficiency. Therefore,in order to achieve the safe and efficient mining of the stope,the structural parameters of the layered roadway in each working area need to be unified and optimized. The simply supported beam model,Winkler model and the field convergence deformation monitoring test method are comprehensively used in this paper. It investigates the influence of the width of layered roadway and the un-roof-contact conditions of filling body on its stability,determining the best theoretical values of the structural parameters of the layered roadway,and verifies the reliability of the theoretical analysis by field test. The results show that the maximum tensile stress of the un-roof-contact height decreases gradually with the decrease of the height and width of the layered roadway,and the safety factor to the height of the un-roofcontact is more sensitive than that of the width. The maximum bending moment of the layered roadway roof appears in the middle of the span,and bending moments still exist at the supporting roof of the deformable foundation of the two sides of the rock, which gradually decreases with the increase of the depth of the side and the height of the roof. The maximum average convergence rate of the layered roadway monitoring surface is 0. 072 m/ d to 0. 174 mm/ d,the deformation rate is low and gradually tends to 0. 02 mm/ d,indicating the overall stability of the layered roadway. When the width of the layered roadway is less than or equal to 5 m,it has good stability. When the width ranges from 5. 0 m to 5. 4 m it is in an unstable state. Effective support measures can be taken to maintain its stability. In the actual production,the width of the layered roadway should be strictly controlled and the quality of the filling roof should be improved to ensure the safety of the mining operation. 

Key words: cemented filling mining method,simply supported beam model,Winkler model,convergence deformation monitoring,stability