Abstract: In order to solve the problem of low recovery of wide coal pillar at large height mining face in deep mine, the effect of plastic area distributions of the two sides of coal pillar and driving disturbance on the roadway deformation under conditions of different width of narrow coal pillar when mining at large height mining face in deep mine have been studied by theoretical calculation, numerical analysis and site engineering measurement. Thus the reasonable width of narrow coal pillar is determined. The results show that the stability of coal pillar and the deformation of roadway surrounding rock affected by driving should be taken into consideration to determine the reasonable width of coal pillar. The coal pillar is seriously crushed when its width of roadway driving along goaf is 5 to 6 m while driving, but it can achieve stability when its width is not less than 7 m. The width needs no less than 8 m while mining, and consequently the deformation of floor and coal pillar is less severe. So it is the optimal decision when the width of coal pillar is 8 m. field monitoring indicates that,the maximum deformation of the two sides of intake airflow roadway in 11030 workface is 1 210 mm, and that of roof and floor is 620 mm, which can meet the requirements of safety production.

Key words: deep mine, large mining height, roadway driving along goaf, narrow coal pillar, plastic zone, numerical simulation