Abstract: In order to optimize the width of coal pillar,improve the coal production rate of mining area and ensure the mining speed of working face,combined with the actual mining conditions of 2—106 working face of Xuehugou Coal Mine,the combination method of theoretical analysis and numerical simulation is proposed to study the reasonable width of roadway production coal pillar of 2—106B working face.Through limit equilibrium calculation,the reasonable wide of coal pillar should not be less than 20.32 m.By numerical simulation analysis,the surrounding rock deformation characteristics under the width conditions of 25,22,20,15,10 m of the protection coal pillars are analyzed,the results show that when the width of coal pillar is 22 m,the concentrated vertical stress in coal pillar gradually transits to distribution shape of the stable asymmetric arch,certain shear failure and tension failure are produced in both sides of coal pillar,but the scope of the area has not been expanded in the middle of coal pillar,the stability of coal pillar is good.When the width of coal pillar is 22 m,the stress of roadway protection coal pillar is monitored in the period that the hydraulic support 2—106B working face is removed.The results show that surrounding rock of roadway is stable,the stability of roadway is good.

Key words: End coal pillar, Retaining width, Theoretical calculation, Numerical simulation