Abstract：Against the severe deformation of return-air roadway of workface 150101 during tunneling in Sucun coal mine,the characteristics and failure mechanism of tunnel deformation were analyzed by using numerical simulation and theoretical analysis. The result shows that the stress distribution and deformation of gob-side entry retaining roadway is affected by the width of coal pillars. Too large or too small coal pillar size is not conducive to the stability of surrounding rock; the reasonable width of return airway of workface 150101 of Sucun coal mine is 5 ~ 6 m. Based on the above and combined with reasonable reserve width of the coal pillar,the changed-width coal pillar along goaf surrounding rock control technology is come up with,and the different strength supports of each segment were supported by different strength. The result of surrounding rock deformation monitor shows that the technology has a perfect effect on the surrounding rack of each segment roadway. It can be used in the coal with similar geological conditions.

Keyword：gob-side entry;increased-width coal pillar;surrounding rock deformation;deformation mechanism;failure characteristic;