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Evaluation of the efficiency of wall-shaping blasts in tunnel driving

โœ Scribed by V. Ya. Shapiro


Publisher
Springer
Year
1990
Tongue
English
Weight
426 KB
Volume
26
Category
Article
ISSN
1573-8736

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After defining the parameters describing the quality of blasts in tunnel driving--the pull efficiency, the overbreak and the HCF factor (the ratio of thee observe length of half cast on the tunnel wall to the total drilled length of the contour holes) --the paper examines the influence of the qualit