Affected by the existence of weak aquifer in the lower strata of the roof,the phenomenon of long-term water leaching in the roof anchor hole of the roadway exists in some coal mines,which leads to the softening of the mud surrounding rock of the roof and the failure of the anchor cable supporting structure,which is easy to induce the safety accidents such as roof breakaway caving.In this pa-per,the main drainage area of coal return air tunnel 11 is taken as the research object.Through the mechanical property test of sur-rounding rock and drilling,it can be seen that the roof argillous rock surrounding rock has low strength,cracks are developed,and it is easy to encounter cement.Combined with site engineering conditions and anchor-injection support mechanism,external anchor-injec-tion support technology is proposed,and a reinforcement support scheme of external anchor-injection for roadway in flood area is de-signed.Through numerical analysis,field industrial test and field monitoring,the reinforcement support parameters and construction technology are optimized,and the deformation of separated layer of surrounding rock is reduced by more than 48%,and the roof water is reduced by more than 80%.It ensures the stability and safety of the roof surrounding rock in the drainage area of coal roadway in the development coal mine.
coal measure stratadripping roadwayanchor injection supportsurrounding rock controlmine pressure monitoring
万方数据
维普
