厚煤层石灰岩顶板大断面沿空掘巷窄煤柱宽度及支护技术研究OA

In order to solve stability problem of narrow coal pillar stability control of large cross-section roadway excavation along goaf on limestone hard roof with thick coal seams,taking the 10107 stoping working face and 10109 transportation crossheading of the No.10 coal seam in Shanxi Dongtai Xinyuan Coal Industry as the engineering background,comprehensive methods such as theoretical analysis,numerical simulation,engineering practice were utilized,and the reasonable width of narrow coal pillars of large mining height and large cross-section roadway excavation along goaf with thick coal seams is determined to be 7.0 m.In view of the problem of lateral support pressure concentration caused by the fracture of the thick and hard limestone roof,pre-roof cutting and pressure relief technology is adopted,and a targeted comprehensive control technology of"strong sidewall and roof protection,bolt-mesh-cable collaboration,high pretension"anchoring for surrounding rock is proposed.The on-site mine pressure monitoring shows that the deformation tends to stabilize after 60 d of roadway excavation,and the phenomena of roof subsidence,two sides convergence,and roof layer separation are effectively controlled.Meanwhile,the reliability of the 7.0 m narrow coal pillar and support technology is fully verified,which can guarantee the long-term stability of roadways and meet the safety production demands of mines.