Abstract
An ammonium nitrate and fuel oil explosive (referred to as ANFO hereinafter) is the most useful industrial explosive in Japan as well as other countries in the world because it is safe and easy to handle, and relatively inexpensive. On the other hand, ANFO easily dissolves in water. Therefore, A packaged explosive such as a dynamite, an emulsion explosive, or ANFO previously charged in a polymer tube cartridge is used when groundwater or rainwater permeates into a bore hole. We developed a granular explosive that has water resistance and the advantage of ANFO such as excellent handle ability, for example, fluidity and usability in a bulk form.
We have evaluated the sufficient explosion performance and the water resistance of the granular explosive in various experiments. Then, we have carried out the field-blasting tests of Water-resistance granular explosive (referred to as WRGE hereinafter). WRGE could be charged directly into bore holes without removal of water contained in bore holes and gave the same fragmentation as in the case of the blasting with ANFO in a dry condition.
硝安油剤爆薬（ANFOと略す）は，取り扱い性に優れ，比較的安全で安価であることから，産業用爆薬として広く使用されている。しかしながら，水に対する著しい溶解性から，水孔ではポリチューブで包装されたカートリッジタイプのANFO，あるいはダイナマイト，エマルション爆薬等，耐水性の良好な爆薬が使用されている。本研究において，バルク装填が可能である等，ANFO同様の取り扱い性を有し，耐水性を付与した粒状タイプの爆薬（耐水性粒状爆薬と略す）の爆発特性及び耐水性について評価し，実用試験において耐水性粒状爆薬の取り扱い性，発破効果について評価を行ったので報告する。
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