现在钻探工程技术人员中一致认为，工作面工具（钻头、钎子）如能保证钻出阶梯状工作面，那么钻钻孔或打炮眼的效率则高得多。这在爆破工作时也应该估计到，根据多年的实际经验证明，破碎单位体积岩石的炸药的数量随自由面的增多而减少。在这种情况下虽然破碎单位体积上的能量消耗小，但是爆破效果却还是一样的。 Now drilling engineers and technicians agree that the face drilling tools (drill bits, brazing) if you can ensure that drilling out the stepped face, then drill holes or play the hole is much more efficient. This should also be estimated during blasting work, which, based on years of practical experience, has shown that the amount of explosives that crush rock per unit volume decreases with increasing free surface. In this case although the energy consumption per unit volume of crushing small, but the blasting effect is still the same.