地下爆破的炮孔组可分为两种基本形式:(1)平巷、平峒或隧道炮孔组,其中唯一的自由面是凿岩面;(2)梯段或回采工作面炮孔组,其中除凿岩面外,还有一个或更多的自由面。此文将讨论第一种形式的仅一个初始自由面的各种爆破。巷道掏槽巷道掘进炮眼组最初和最关键部分是巷道掏槽。虽有多种专门的掏槽形式,但所有的巷道掏槽均可归入两种分类之一:角锥形 Blowhole group blasting underground can be divided into two basic forms: (1) Lane, Pinghu or tunnel blasthole group, of which the only free surface is drilling face; (2) bench or mining face blasthole group , In addition to drilling face, there are one or more free surface. This article will discuss the first form of a variety of blasting of only one initial free surface. Tunneling Tunneling The first and the most critical part of a tunneling tunnel was the undercutting of the tunnel. Although there are a number of specialized undercutting forms, all undercutting can be classified into one of two categories: pyramids