Research on grouting reinforcement and support technology of return airway in residual mining face
In order to solve the problem that the return airway of No.7615 residual mining face in Wuyang Mine is in the middle of the coal pillar stress concentration area,in the process of mining unloading,the roadway is in front of the working face,the surrounding rock on the mining side is deformed,the coal body on the side is seriously squeezed out,and the anchor cable anchorage failure is difficult to guarantee the production.The internal conditions of No.7615 working face are analyzed,and the problems existing in the original support are discussed.The grouting reinforcement technology and the long and short anchor cables of the roof are proposed to strengthen the support.After the numerical simulation verification,the industrial test is carried out.The results show that the displacement of the roof and floor and the displacement of the two sides are reduced by 82.20％and 69.75％respectively.The new grouting reinforcement and support technology effectively controls the shrinkage of roadway section and maintains the long-term stability of roadway.
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