You need JavaScript to view this

Study on the detonation properties of explosives in bore hole and precise controlled blasting; Happa konai no bakuyaku no bakugosei to seimitsu seigyo happa ni kansuru kenkyu

Abstract

In order to perform efficient and safe controlled blasting, attaining sufficient detonation from explosive is important. Therefore, a mechanism of detonation in a bore hole was studied. Two detonation phenomenon measuring methods were established: one is a continuous detonation speed measuring method by using a resistance wire probe, and another is a detonation mark observing and evaluating method using aluminum and metallic lead plates. Assuming delay blastings in multiple bore holes used practically, discussions were given on detonation phenomena of explosives under pressurized condition. Under dynamic pressure condition, size of the pressurization and delay time of the detonations affected largely the detonation. Discussions were given on blasting effect and safety according to difference in forward initiation and reverse initiation. The reverse initiation method was verified to have excellent blasting effect, maintain good face conditions, and assure safety against inflammable gases. A precision initiation method was developed, which can control the initiation time of a detonator more precisely. The initiation accuracy is more than 1000 times greater than the ordinary instantaneously detonating electric detonator. The precision control of the initiation time proved to develop greater crack propagation. Vibration and stone scattering were also controlled. This paper also describes application of the  More>>
Authors:
"NONE"
Publication Date:
Oct 08, 1997
Product Type:
Miscellaneous
Report Number:
ETDE/JP-98754354
Reference Number:
SCA: 450100; 422000; PA: JP-98:0I0103; EDB-98:075748; SN: 98001949459
Resource Relation:
Other Information: PBD: 8 Oct 1997
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; BOREHOLES; EXPLOSIVE FRACTURING; EXPLOSIONS; SAFETY; ENERGY EFFICIENCY; CHEMICAL EXPLOSIVES; TIME DEPENDENCE; CONTROL; ACCURACY; IGNITION; HOT WIRE ANEMOMETERS; TIME DELAY; WORKING FACES; DETONATORS; SEISMIC SURVEYS
OSTI ID:
625019
Research Organizations:
National Institute for Resources and Environment, Tsukuba (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98754354; TRN: JN98I0103
Availability:
Available from National Institute for Resources and Environment, 16-3, Onogawa, Tsukuba, Ibaraki, Japan (Japan); OSTI as DE98754354
Submitting Site:
NEDO
Size:
92 p.
Announcement Date:

Citation Formats

Study on the detonation properties of explosives in bore hole and precise controlled blasting; Happa konai no bakuyaku no bakugosei to seimitsu seigyo happa ni kansuru kenkyu. Japan: N. p., 1997. Web.
Study on the detonation properties of explosives in bore hole and precise controlled blasting; Happa konai no bakuyaku no bakugosei to seimitsu seigyo happa ni kansuru kenkyu. Japan.
1997. "Study on the detonation properties of explosives in bore hole and precise controlled blasting; Happa konai no bakuyaku no bakugosei to seimitsu seigyo happa ni kansuru kenkyu." Japan.
@misc{etde_625019,
title = {Study on the detonation properties of explosives in bore hole and precise controlled blasting; Happa konai no bakuyaku no bakugosei to seimitsu seigyo happa ni kansuru kenkyu}
abstractNote = {In order to perform efficient and safe controlled blasting, attaining sufficient detonation from explosive is important. Therefore, a mechanism of detonation in a bore hole was studied. Two detonation phenomenon measuring methods were established: one is a continuous detonation speed measuring method by using a resistance wire probe, and another is a detonation mark observing and evaluating method using aluminum and metallic lead plates. Assuming delay blastings in multiple bore holes used practically, discussions were given on detonation phenomena of explosives under pressurized condition. Under dynamic pressure condition, size of the pressurization and delay time of the detonations affected largely the detonation. Discussions were given on blasting effect and safety according to difference in forward initiation and reverse initiation. The reverse initiation method was verified to have excellent blasting effect, maintain good face conditions, and assure safety against inflammable gases. A precision initiation method was developed, which can control the initiation time of a detonator more precisely. The initiation accuracy is more than 1000 times greater than the ordinary instantaneously detonating electric detonator. The precision control of the initiation time proved to develop greater crack propagation. Vibration and stone scattering were also controlled. This paper also describes application of the method to a rock elastic wave exploration technique. 136 refs., 99 figs., 13 tabs.}
place = {Japan}
year = {1997}
month = {Oct}
}