摘要
为了减少安家岭露天矿爆破成本和提高爆破效果,用LS-DYNA软件模拟真实的现场环境和爆破过程,探讨并获得了30 m高度台阶的合理炮孔顶部充填长度和炸药单耗量。结果表明：在炮孔充填长度分别为7 m、7.5 m、8 m、8.5 m和9 m时,通过比较岩石最不利破碎点Y方向上拉应力与抗拉强度的大小,得出炮孔充填长度合理区间为8~8.5 m;在炸药单耗分别为0.45 kg/m3、0.50 kg/m3、0.55 kg/m3和0.60 kg/m3时,通过比较台阶坡底自由面处、两炮孔中心线延线距自由面0.5 m处和Y方向上相同高度台阶坡面处的拉应力与抗拉强的大小,得出合理的炸药单耗量为0.55 kg/m3。
In order to reduce blasting cost and to improve the blasting effect in Anjialing open-pit mine, the software of LS-DYNA was used to simulate the real environment and blasting process, by which the blasting hole stem- ming length and specific charge on the 30 m bench height condition were obtained. The results show that, on different cases of stemming length with 7 m,7.5 m,8 m,8.5 m and 9 m,by comparing the most unfavorable rock broken point of tensile stress and tensile strength on the Y direction, the reasonable stemming length was obtained as 8 m to 8.5 m ; when the specific charge was 0.45 kg/m3 ,0.50 kg/m3 ,0.55 kg/m3 and 0.60 kg/m3 respectively, by comparing the tensile stress and tensile strength on bench toe of free surface,the same height of bench face on the Y direction and the two-hole extended line near to free surface 0.5 m, the reasonable specific charge was given as 0.55 kg/m3.
出处
《爆破》
CSCD
北大核心
2016年第3期47-52,共6页
Blasting
基金
国家自然科学基金重点项目(煤炭联合基金)大型露天煤矿绿色开采理论与应用(U1361211)
国家自然科学基金面上项目基于绿色度的露天煤炭生态环境恢复与开采一体化技术(51474119)
