Ammunition and explosives – Blasting
Patent
1992-08-18
1994-12-27
Nelson, Peter A.
Ammunition and explosives
Blasting
102312, F42D 300
Patent
active
053755278
ABSTRACT:
The present invention is to provide a method for blasting employing bar-like charge, having a pure blasting coefficient for maximum fracturing performance without causing danger of flying rock or so forth. At first, digging a random length H of a blast hole consisting of a charge length N and a least resistance distance W from the upper end of the charge length N to a free surface G. Secondly, defining a first and second distances D1 and D2, as limitation of fracture force acting on the free surface G, of each length corresponding to the least resistance distance W and corresponding to each other from an opening end E of the blast hole. Finally, defining a charge amount L under the condition of which a blasting coefficient c, namely, a proportion of the charge amount L to a fracture rock volume V=H.times.D1.times.D2 is within from 0.25 to 0.45.
REFERENCES:
patent: 4205610 (1980-06-01), Zerga
patent: 4262965 (1981-04-01), Ricketts
patent: 4976199 (1990-12-01), Beukes et al.
patent: 5014622 (1991-05-01), Jullian
patent: 5090325 (1992-02-01), Saito et al.
Japan Industrial Explosive Association "New Industrial Explosive" published on Oct. 1, 1985, pp. 198 to 200.
"Explosive Safety Text Series 17, Application of Explosive in Occasions" edited by Ministry of International Trade and Industry, Ground Emission Division, published by Shadan Hojin Zenkoku Kayakurui Hoan Kyokai, Jan., 1991, pp. 45 to 46.
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