Technology of Gob- side Entry Retaining and Roadside Filling Support in Hard Roof and Hard-thin Coal Seam

In order to solve the problem of large amount of excavation in coal- rock roadway in the mining process of hard roof and hard-thin coal seam, this paper i ntroduced the gob- side entry retaining and roadside flling support technology. Through the theoretical analysis of the support mechanism, the authors determined the r oadway reinforce support project, developed the high- efficient flling materials, optimized the support design parameters of roadside flling body and simplify the constr uction process. Practical results showed that the effect of this support technology was remarkable, the flling body could contact to the roof tightly and contacting roof ra te was not less than 95%, the initial setting time of flling body was less than 40 minutes and its early strength could be achieved around 2 MPa, it also had some certai n shrinkage. The max deformation value of the two sidewalls could be controlled within 123 mm and the max deformation value of the roof- to- floor convergence could be controlled within 114 mm, the support effects reached the anticipated requirement.