Research On Blasting Parameters And Hole-by-hole Initiation Optimization Of 108 And 402 Sections Of Jinsha Mining

At present,blasting is the main means of rock breaking in metal mine engineering excavation and ore body mining in China,but the dynamic disturbance of blasting will have a negative impact on the normal life of nearby residents,especially the safety and stability of residential surface buildings.Under such circumstances,how to reduce and control blasting vibration,guarantee the stability of the surface houses,and guarantee the blasting effect and production efficiency is a technical problem that must be solved.Based on the"key technology research project of blasting parameter optimization and blasting vibration control in Jinsha mine of Yongshan County",the blasting scheme of 402 and 108 mines in Jinsha mine is optimized and designed.In this paper,an in-depth study is carried out.By the theory of Livingston blasting funnel,the experiment of blasting funnel is carried out.In 402 mine and 108 mine,the single hole blasting funnel test,the same section blasting funnel test with variable hole distance and the inclined bench test were carried out respectively.The results show that the hole network parameters of the 40mm hole diameter in402 mine are 1×0.85m,the unit consumption is 0.8kg/m~3,and the hole network parameters of the 76mm hole diameter in 26-28 mine are 1.1×0.8m,the unit consumption is 0.7kg/m~3.Based on the principle of delay time interference and vibration reduction,this paper analyzes the underground blasting vibration data by HHT method,and carries out the contrast test of different row and hole delay time in the underground.After blasting,the vibration measurement results are analyzed,and it is determined that when the delay between holes is25ms,the vibration is the minimum;and it is determined that when the delay between holes is75ms,the vibration is the minimum.The results show that:it is recommended that the delay time of underground blasting row in Jinsha mining is 75ms,and the delay time between holes is 25ms.At this time,the peak vibration speed of blasting vibration is the minimum,and the vibration duration is the shortest.For underground buildings Personnel and equipment are also the least hazardous.