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基洛夫燐灰石矿在掘进水平和和垂直坑道时,采用了直线掏槽,其掘进工程约有70%是在普氏强度系数为6～8的岩石中进行的,30%是在8～12的岩石中进行的.矿体被霓石(纯钠辉石)、赤跌矿和另外一些强度系数为12～16的矿物夹层与裂隙带所切割.目前该矿使用了几种变形的直线掏槽,其一般特征是炮眼依次爆破.标准的掏槽如图1.a所示,炮眼直径为40～44公厘,每根导火线之长度差为8～10公分,平均眼深为2.0～2.2公尺,在垂直坑道中炮眼利用系数为0.90,在水平坑道中炮眼利用系数为
Approximately 70% of the excavation works are carried out in rocks with Plattenic strength coefficients of 6 to 8 and 30% are in the range of 8 to 12 Of the rocks carried out by the ore body is niirite (dodecium), Che Teng ore and other strength coefficients of 12 ~ 16 mineral intercalation and fracture zone cut the current use of the mine several straight-line dig Trough, the general characteristics of the blasthole blasting in. The standard trenching shown in Figure 1.a, the diameter of the blasthole 40 to 44 mm, the length of each fuse the difference is 8 to 10 cm, the average depth of the eye is 2.0 to 2.2 Meters, the hole utilization factor of blasthole in vertical tunnel is 0.90, the utilization factor of blasthole in horizontal tunnel is