Experimental Study on Pre-splitting Blasting Technology Based on Initiation Characteristics of Digital Electronic Detonator
The approach filling mining method divides the orebody into ore room and pillar,and adopts a two-step mining method,that is,one step first returns to the mining pillar and fills,and then the two-step room mining is carried out after the filling body reaches the design strength.Under this mining method,if the ore-rock conditions are relatively poor and the drilling and blasting parameters are unreasonable,it will not only lead to poor forming effect of the side wall contour of the stope after the mining of the ore room,serious over-excavation and under-excavation,large ore loss rate and dilution rate,but also large harmful effect of blasting vibration,serious damage and collapse of the filling body,which deteriorates the working conditions of the stope and seriously restricts the mechanization and large-scale mining of the mine.In order to solve such problems,this pa-per takes an underground mine as an example,and uses the detonation characteristics of high-precision digital electronic deto-nators to carry out one-step mining downward hole pre-splitting blasting technology research and field test work.The study re-sults show that:① After adopting the digital electronic detonator pre-control interface blasting test scheme,the pre-control in-terface of the stope side is clearly visible,the half-wall hole mark rate can reach more than 60%,and the over-under-excavation amount can also be controlled within 20 cm,creating favorable conditions for the two-step room mining.② The peak value of blasting vibration is greatly reduced,the filling body near the blasting area is effectively protected,and the collapse phenome-non is greatly reduced.③ The noise and shock wave generated by the exposed detonating cord in the explosion process are a-voided,which is harmful to the blasting personnel.The physical and mental health of the blasting personnel is effectively pro-tected,and the working environment is significantly improved.④ The consumption of civil explosives is reduced by 0.46 yuan/m3,which effectively reduces the blasting cost and has significant economic benefits.The above study results can provide experience for similar mines.
underground minemine blastingdigital electronic detonatorspresplitting blastingsurrounding rock control
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