Blact hole cxplesion in a confed condition within tunneling is analysized,a stage-by-stage blast hole design theory and the related paraameters are presentes.
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张拔川.掘进爆破中炮眼的设计探讨[J].钻探工程,1995,(2):50-51.Zhang Bachuan. Discussion on Blast Hole align in Tunnelling[J]. Drilling Engineering, 1995,(2):50-51.