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直眼掏槽法就是一组掏槽炮眼均垂直于掘进断面,其中有一个或一个以上的不装药眼(空眼),空眼起释放岩石应力和临时储存岩石的作用。这种掏槽法又称为“烧孔掏槽法”或“粉碎掏槽法”。我们曾用过的“平行龟裂法”、“圆筒掏槽法”亦属于这种掏槽法。直眼掏槽法的主要优点是:即使在小断面巷道中亦可实现深孔作业,所有炮眼都相互平行,钻眼方便,可用手工打眼,亦可用钻车打眼;爆破时岩石抛掷力小,对于保护临时支架及提高装岩效率都有利。而其缺点则是:与其他掏槽法相比,钻眼数目
Straight-eye cut method is a set of cut-out hole perpendicular to the tunneling section, which has one or more uncharged eye (empty eye), empty eye release rock stress and the role of temporary storage of rock. This cut method is also known as “burn hole cutting method” or “grinding cut method.” We have used the “parallel cracking method”, “undercutting method” also belongs to this undercutting method. Straight-eye cut method of the main advantages are: even in small cross-section roadway can also be achieved deep hole operations, all borehole are parallel to each other, bored convenient, available hand-drilling, drill holes can also be used; blasting rock throwing power is small, For the protection of temporary stents and improve rock loading efficiency are beneficial. The disadvantage is: compared with other undercutting method, the number of drilling