Drilling and Blasting an overview ScienceDirect Topics
2011111 ensp 0183 enspZongXian Zhang in Rock Fracture and Blasting 2016 17 1 Introduction Conventional drifting or tunneling by drilling and blasting method requires a much higher specific charge than ordinary production blasting such as bench blasting For example the specific charge at tunneling is 3–10 times higher than at bench blasting depending on borehole deviation tight holes lift of the
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