Technology of Roof Control During Terminal Mining of Fully-mechanized Coal Face with 7m High Cutting Height

In order to prevent the hydraulic powered support jammed and roof fall accident during terminal mining of fully- mechanized coal face with 7 m high cutti ng height, based on the experiences and roof control technology of first fully- mechanized coal face with 7 m high cutting height in Daliuta Coal Mine, the paper researc hed the roof control technology during terminal mining of second fully- mechanized coal face with 7 m high cutting height. The analysis showed that the roof hanging dis tance too long, the position of wire mesh unreasonable, the hanging wire mesh time too long and Lower bracket supporting performance were the main reasons of roof control difficulty during terminal mining in coal mining face. The preventive measures of strengthening mineral pressure observation, strengthening coal by pre-grouting marithan, determining the position of wire mesh reasonable, improving supporting performance and shortening the hanging wire mesh time were used to solve the probl em of roof control difficult, hydraulic powered support jammed and roof fall during terminal mining of fully- mechanized coal face with 7 m high cutting height, to ensure fully- mechanized coal face with 7 m high cutting height through terminal mining safety.