ANFO爆薬の起爆特性について
1975 年 91 巻 1051 号 p. 589-594
詳細
1975 年 91 巻 1051 号 p. 589-594
In this paper, some problems about propertv of ANFO mixtures is examined, to change our easy preconception.
Each conclusion about these is as follows.
(1)The condition of confinement is one of the most important factor to initiate ANFO.Even enough amount of primer can not initiate ANFO (permitted by JIS) without adequate condition of confinement.On the contrary, if the condition of confinement is adequate ANFO can be initiated perfectly only with a No.6 cap (it is standard cap in Japan).
(2)Lead block expanding test for ANFO can be carried out without any modification.Ballistic mortar test can also be done with such a simple modification as to pack ANFO with aluminum foil and to stick the bottom of it to the end wall of chamber, or as to charge ANFO into a cylindrical tin foil with a tin plate on the bottom of it.and to explode it in the middle of chamber, so as to promote the cavity effect of cap. For reference, R.W.S of ANFO is 81.2.
(3) Ordinary necessary amount of primer should not be decided per total amount of ANFO in bore hole, but per diameter of bore hole.
(4)A postscript: ANFO which is exposed below the temperature of-18°C apt to break into fine particle, consequently, it is become more Sensitive.
