Study on mechanism of inwall reinforcement of coal mine shaft wall

The safety production of coal mine is seriously threatened by the rupture of shaft wall.Shaft wall could be reinforced at inner wall to avoid failure.Based on the theory of elasticity,the analytic solution of stress components at inner wall of shaft wall of coal mine has been deduced.And the influence of reinforcement at inner wall on the value of stress components of inner wall has been studied.The mechanism and effect of reinforcement at inner wall has been discussed with case study.It can be found that the vertical stress of shaft wall decreased when reinforcement at inner wall,which enhanced the stability of shaft wall.Reinforcement at inner wall can be realized by assembling pressure steel plate at inner wall,with the characteristics of simple construction,short time of occupying the shaft wall and low cost.The key point of reinforcement at inner wall is to maintain the pressure of steel plate at design value.The results of this study would provide theoretical basis for inner wall reinforcement of shaft wall.