Support technology research and application inside roadway of gob-side entry retaining

Abstract：According to the situation of gobside entry retaining with the large and uneven deformation and poor sup port effects, took gobside entry retaining in Qinxin colliery as engineering background, dealt with the numerical simu lation analysis the relationship between support inside roadway, surrounding rock deformation and stress distribution, and the obtained support mechanism inside roadway of gobside entry retaining are as follows：with the application of support with high resistance and yielding, increasing carrying capacity and deformation resistance of surrounding rock in roadway, adapting to large deformation and stress adjustment. The developed support technologies inside roadway of in gobside entry retaining are：①basic support：using highstrength bolt and anchor support owning high prestress force, increasing carrying capacity of surrounding rock and adapting to large deformation;②reinforced support：within a certain range behind working face, in gobside entry retaining, the hydraulic support with high resistance and yielding is used to strengthen roof and floor support, which means that in the intense stage of roof breakage and stress adjust ment of surrounding rock of gobside entry retaining, the hydraulic support can be used to support the roof and floor ef fectively and reduce the rotating, sinking of roof and floor heave, maintaining the stability of surrounding rock in gob side entry retaining;③after the surrounding rock deformation stability in gobside entry retaining, the hydraulic sup POrt used as reinforced support can be. remnved