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众所周知,掘进独头巷道时的炮眼利用系数平均为0.7—0.8,而且常常低于0.7。这里所提出的掏槽眼装药结构和爆破原则可使炮眼利用系数不小于1,其实质是:在巷道工作面中心部位平行巷道轴线钻凿一超前炮眼1,孔深比其它炮眼约深25—30厘米,距中心炮眼周围20—30厘米钻凿几个平行炮眼(见图)。辅助眼和边眼的位置随需要而定。超前炮眼只在超出其它炮眼(即与中心炮眼平行的炮眼,如2、3、4、5等)的部分装药,其
It is well-known that the borehole utilization factor when driving a single-headed roadway averages 0.7-0.8, and often less than 0.7. Here proposed undercutting charge structure and blasting principle can make use of blasthole utilization factor of not less than 1, in essence: in the center of the tunnel face parallel to the axis of the tunnel drilling an advanced hole 1, the hole depth of about 25 times deeper than the other blasthole -30 cm, drilling several parallel bore holes 20-30 cm from the center hole (see picture). Auxiliary eyes and the location of the eye as needed. The pre-blasthole is only partially charged beyond the other blasthole (ie, the blasthole parallel to the central blasthole, such as 2, 3, 4, 5, etc.)