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임한욱,권오성 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
In underground drilling and blasting, particularly in small headings(generally under 20㎡), the prospects for changes of blast parameters are usually more limited than those employed by large area tunnel(over 20㎡). It is also well known that the consumption of explosives and specific drilling rate for small tunnel areas are exponentially increased also tunnel areas decrease. To confirm above results, some tests for two tunnels(irrigation water tunnel with 6.0㎡ area, electric supplies tunnel with 15.0㎡) are also carried out in this study. As a results, specific drilling rate and specific charge for irrigation water tunnel were decreased from 13.8 to 7.7m/㎥ and from 4.88 to 2.56kg/㎥ respectively. Those for electric supplies tunnel were also decreased from 8.0 to 4.9m/㎥ and from 3.46 to 2.22kg/㎥.
임한욱,오병화 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A
To determine the optimum ventilation systems during long tunnel excavation, the velocity vector profile and the contaminant's distribution at working place are studied using 2-D, 3-D numerical analysis. The main results can be summarized as follow; In case of long tunnels, blower-exhaust-mixture types which enable to use soft blast ducts is most appropriate in terms of ventilation and economical efficiency. Of the same ventilation types, ventilation efficiency has a difference according to blast ducts and the distance between fan and working place. The 3-D numerical result shows that arranging blower and exhaust ducts in the right and left corners of the tunnel respectively is effective to discharge contaminant. The result of the real measurement shows that CO concentration can be reduced to below 50 ppm, which is regulation value, as 16-minutes fan operation goes on.