庙沟铁矿露天转地下开采爆破参数优化

为给庙沟铁矿露天转地下开采设计提供最优的爆破参数，结合矿山设计的具体情况，在选定爆破抵抗线长度为1.8 m的基础上，以孔底距为主要参数，对地下开采无底柱分段崩落法的爆破参数设计了4个方案。对设计的4个中深孔爆破方案分别进行了数值模拟计算和爆破效果的综合评价分析。数值模拟结果表明，4个方案的爆破有效应力均能达到矿岩破碎的效果，孔底距长度对爆破有效应力值没有显著影响。以炸药成本、采幅、适宜块度率为评价爆破效果的主要因素，通过模糊综合评价，得出矿山的最优爆破参数是孔底距为2.52 m，为矿山的施工提供了数据依据。

Blasting Parameter Optimization Research of Miaogou Iron Mine from Open-pit to Underground Mining

In order to provide optimal blasting parameters for Miaogou Iron Mine transmitted from open-pit to underground mining，combining the practical situation of the mine design，four schemes are designed on blasting parameters of underground sublevel caving，where the length of blasting resistance line is 1.8 m and the hole bottom distance is taken as main parameters.For the four medium and deep hole blasting schemes，numerical simulations along with comprehensive evaluation and analysis of blasting effect are carried out.Numerical simulation shows that all the four kinds of blasting effective stress can break the rock.The hole bottom distance has no significant influence on blasting effective stress.Explosive cost，mining sites and suitable block rate are taken as main factors to evaluate blasting effect.Through fuzzy comprehensive evaluation，it is concluded that the blasting parameter is optimal when the hole bottom distance is 2.52 m，which provides data basis for mine construction.