Study on 5 m Deep Borehole Controlled Blasting Technology of Large Cross Section Mine Shaft
ZHANG Hao
HE Lei
MA Wei-qing
Abstract：According to low utilization rate of the 5 m deep controlled blasting borehole and poor blas‐ting quality in an auxiliary mine shaft of Sishanling Iron Mine ,optimized technical measures of the mine shaft wall quality control with the periphery boreholes combined with shallow boreholes along the external ring ,interval double pipes with forward and reverse charging and two stage vertical bore‐hole sectional cutting were provided and a site blasting trial was conducted. The results showed that after the optimization of the 5 m deep borehole controlled blasting ,the utilization of the blasting bore‐holes was over 90%. Thus the shaft wall overbreak or underbreak ,blasting flying rock and other prob‐lems were solved ,the blasting effect was improved and the technical and economic benefits were re‐markable.
Keywords：mine shaftdeep borehole controlled blastingshallow boreholes along external ringsec-tional slottingforward and reverse charge
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 27-32 )