Ammunition and explosives – Blasting
Patent
1998-12-02
2000-12-05
Nelson, Peter A.
Ammunition and explosives
Blasting
102302, 102312, F42B 300
Patent
active
061551724
ABSTRACT:
The present invention provides a method for setting parameters required for any type of blasting operation using a bar-like charge system by devising equations based on which the maximum blasting efficiency may be achieved within a safe range to prevent flying rock accidents even when the line of least resistance W or filler length P is unknown. When defining a blast hole diameter, i.e., charge diameter as d, a charge hole length as M, a filler length as P, a charge length N=M-P, a fracture radius or interval length as D, and the specific gravity of charge as A, if the charge hole angle with respect to the first free surface G1, is .alpha..ltoreq.90.degree., based on an equation for setting blasting coefficient c: ##EQU1## and by removing the filler length P therefrom, a fracture rock volume V may be determined as: ##EQU2## and a charge amount L may also be determined as: ##EQU3##
REFERENCES:
patent: 3735704 (1973-05-01), Livingston
patent: 5375527 (1994-12-01), Nakajima
patent: 5634691 (1997-06-01), Kim et al.
patent: 5650588 (1997-07-01), Nakajima
R. Gusteferson: "New Blasting Techology" Morikita Shuppan K.K., Apr. 10, 1981, pp. 60.
Ground Emission Division of Ministry of International Trade and Industry of Japan, "Explosive Safety Text Series 17", Jan., 1991, pp. 24, 25 and 46.
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