三貴口鉛鋅礦中深孔爆破參數優(yōu)化研究與應用
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紫金(長(cháng)沙)工程技術(shù)有限公司

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Optimisation and Application of Medium and Deep Hole Blasting Parameters at Sanguikou Lead-zinc Mine
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Zijin (Changsha) Engineering Technology Co., Ltd.

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    摘要:

    為了解決三貴口鉛鋅礦采用分段鑿巖階段空場(chǎng)嗣后充填法對礦塊進(jìn)行回采時(shí)出現的大塊率較高、二步采時(shí)兩側充填體及頂柱破壞嚴重、礦石貧化率較大等問(wèn)題,對原有爆破參數進(jìn)行了優(yōu)化研究,改用直徑為76mm的炮孔,通過(guò)理論計算得到排距為1.8m,孔底距為2.1m歪茉;或者排距為1.9m,孔底距為2.0m。現場(chǎng)工業(yè)試驗采場(chǎng)相對使用原爆破參數的采場(chǎng),其貧化率降低了19.8%,損失率降低了4.6%,炸藥單耗降低了12.2%,大塊率降低了34.8%哈爹;同時(shí)結合LS-DYNA有限元軟件對優(yōu)化前后爆破效果的模擬結果表明:采用優(yōu)化后的爆破參數進(jìn)行爆破時(shí),大塊率較小剩蟀,對兩側的充填體、頂柱及鑿巖巷道眉線(xiàn)的損傷較小。

    Abstract:

    In order to solve the problems of high block rate, serious damage to the filling body and roof column on both sides during two-step mining, and large ore depletion rate, etc., which appeared when the ore block was mined back in the Sanguikou lead-zinc mine by the filling method after the rock drilling stage, the optimization of the blasting parameters was carried out, and the blasting holes with diameter of 76mm were used instead, and the theoretical calculations showed that the distance between the rows of holes was 1.8m, and the distance between the bottoms of the holes was 2.1m; or the distance between the rows of holes was 1.9m, and the distance between the bottoms of the holes was 2.0m. Compared with the original blasting parameters, the depletion rate of the on-site industrial test quarry was reduced by 19.8%, the loss rate was reduced by 4.6%, the unit consumption of explosives was reduced by 12.2%, and the block rate was reduced by 34.8%; at the same time, combined with the simulation results of the blasting effect before and after the optimization by LS-DYNA finite element software, the results show that: when using the optimized blasting parameters for blasting, the chunk rate is smaller, and the blasting effect on both sides of the hole is more effective than the original one. The block rate is smaller, and the damage to the filling body on both sides, the top pillar and the brow line of the rock-cutting roadway is smaller.

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  • 收稿日期:2024-05-23
  • 最后修改日期:2024-06-20
  • 錄用日期:2024-06-24
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