Abstract:

Abstract: The stress distribution and the stability of the roadway surrounding rock is deferent from the typical gob-side entry driving when keeping small coal pillar to dig the lane along the gob-side entry retaining. It will benefit to the stability of the coal pillar and decrease the width of the coal pillar because of the high strength filling wall of the gob-side entry retaining works to support the roof of the goaf. In this paper numerical calculation software was used to research the stability of small coal pillar along the gob-side entry retaining and the effect on the deformation of the surrounding rock in driving tunnel with different width of coal pillar and different anchoring strength of rock bolts, a conclusion was drawn that the width of the coal pillar is the decisive factor which affects the stability of the coal pillar and the deformation of surrounding rock, and the high system support strength can control the deformation of surrounding rock efficiently. According to the engineering background of the 1111(1) working face’s track drift in ZhuJi coal mine, the vertical stress of the coal pillar is low with a small influence circle and the deformation of the coal pillar and the roadway, it’s stability is best of all when the coal pillar is 3m wide. The high strength bolt supporting scheme was determined based on that basis. The stability of coal pillar and the big driving tunnel deformation were successfully controlled.

Key words: Key words: gob-side entry retaining, width of coal pillar, driving roadway along goaf, numerical simulation, bolt support