Application of Surface Ground Grouting Backfill Reinforcement Technology to Mine Shaft Sinking Passing Through Multi Mining Goaf
ZHOU Jian-feng
Abstract：In the mine shaft sinking operation of the mine auxiliary shaft and the mine air return shaft in Majiliang Mine ,the two shaft sinking operations were passed through the mining goaf in Jurassic Sys-tem No.2 seam and No.11 seam.Before the mining goaf of the seam exposed in the mine shaft sinking operation ,a surface ground grouting backfill reinforcement technology with cement and fly ash grout was applied to the treatment of the mining goaf.There were 4 circles of the grouting boreholes made around the surface ground of each mine shaft ,the diameters of the circles were 24 ,30 ,60 and 72m , there were 4~6 boreholes set in each circle and the grouting pressure was 2.0~3.0MPa.There were 16 750m3 of the cement and fly ash grout totally injected in the mine auxiliary shaft ,there were 17 235 m3 of the cement and fly ash grout totally injected in the mine air return shaft and an effective backfill reinforcement was obtained in the mining goaf.In the mine shaft sinking operations of the two mine shafts ,all two mine shafts were safely and rapidly passed through the mining goaf.
Keywords：mine shaftmining goafsurface ground groutingcement and fly ash grout
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 8-12 )