Grouting reinforcement technology of surrounding rock of retraction tunnel for large mining height working face
Aiming at the problems of severe mine pressure and difficult roadway support during the final mining period of the large mining height working face,the surrounding rock control of the final mining retraction tunnel was studied against the background of the 112204 working face of Xiaobaodang No.1 Coal Mine.The method of on-site investigation was used to an-alyze the deformation of the surrounding rock of the 112204 retraction tunnel,clarify the grouting reinforcement mechanism,and determine the reasonable grouting parameters.The maximum subsidence of the roof of the 112204 retraction tunnel after grouting reinforcement was reduced by 88.75％compared with that of the 112201 retraction tunnel,and the final mining fin-ishing work was completed 5.5 days earlier.The results show that the grouting reinforcement of the retraction tunnel of the large mining height working face can effectively control the deformation of the roadway in the final mining stage,which is of great significance for achieving safe,efficient,economical and reasonable retraction.
large mining height working faceretraction tunnelroof supportsurrounding rock deformationgrouting rein-forcement
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