Application of High Water Content and Quick Setting Material to Ultra High Roof Failing Control of Mine Gateway

In order to handle the ultra high roof failing occurred by the fault,according to the quick setting,initial high strength,good flowability,adjustable setting time and high permeability and other features of the high water content material,the high water content material was successfully applied to handle the ultra high roof failing in-550 m level south wing transportation roadway of Xinqiao Coal Mine.A roof failing cave with about 8.5 m height was sealed and the surrounding rocks of the roof failing zone were reinforced.The integrality and the stability of the broken surrounding rocks were improved and the re-failing and caving of the failing cave could be effectively prevented and controlled.