Deformation and failure characteristics and the control technology of main roadway in extra-thick coal seam
In view of the problems in characteristics analysis and control technology of deformation and failure of the main roadway in the extra-thick coal seam,we took the second level return air roadway in Yanbei Coal Mine as the research background,analyzed the geo-mechanical test results and the deformation-failure characteristics and mechanism of the roadway surrounding rock,proposed a comprehensive surrounding rock control technology with full section grouting reinforcement and high pre-stress support,formulated an implementation plan of the roadway repair and reinforcement,and determined the corresponding technical parameters.According to the underground industrial test results,the roadway deformation tended to be stable about 35 days after the repair and reinforcement,the maximum side-to-side and roof-to-floor convergence were 63.5 mm and 79.8 mm,respectively.After grouting,the cement slurry was fully cemented with the seam cracks and broken areas of the roadway side,the surrounding rock cracks were significantly reduced,and the drilling forming effect was significantly improved.It shows that after adopting high pre-stressed bolt support and full section grouting reinforcement,the anchor-grouting reinforced body forms in the roadway surrounding rock,which improves the stability and deformation resistance of the roadway surrounding rock and the mechanical properties of the shallow anchor(cable)anchoring foundation,thus the surrounding rock deformation can be controlled.
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