Ammunition and explosives – Blasting
Patent
1996-04-29
1997-07-22
Nelson, Peter A.
Ammunition and explosives
Blasting
102302, 102312, F42B 300
Patent
active
056505884
ABSTRACT:
This invention is to provide a setting method of blasting in bar-like charge which is reasonable to achieve both of safety and maximum blasting or fracturing efficiency, and to provide the method which can be setting accurately a charge hole diameter d relative to the other facters.
A safety charge amount L is derived by controlling a nominal total fracture rock volume V, namely, a filler length P.sup.2 .times.a charge hole length M, with an inclination coefficient sin.sup.3 .alpha..times.a blasting coefficient c.
A charge hole diameter d is derived by the fact that the (sin.sup.3 .alpha..multidot.c.multidot.P.sup.2 .multidot.M) is equal to a ((.pi./4)d.sup.2 (M-P)) which applies the expression for deriving a volume of a circular column.
REFERENCES:
patent: 3735704 (1973-05-01), Livingston
patent: 3804017 (1974-04-01), Venable et al.
patent: 4273049 (1981-06-01), Edwards et al.
patent: 5375527 (1994-12-01), Nakajima
patent: 5386778 (1995-02-01), Sullivan, Jr.
"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, p. 24.
"New Technology of Explosive" edited by R. Gusterferson, published by Morikita Shuppan Kabushiki Kaisha, Apr. 10, 1981, p. 60.
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