Science and Technology of Energetic Materials

Vol.66, No.5 (2005)Special Issue for ISEM 2005


Developments and field tests of granular emulsion explosives
Takuya Taguchi, Shigeyuki Sasaki, Toshinori Ariki, and Yosuke Kimura


Highly improved drilling machines and mucking machines have been used for the underground construction. To have rapid construction, particularly, it is important to shorten the cycle time of blasting operation. At the most tunneling in the present, cartridged emulsion explosives have mostly been used for tunnel blasting in Japan. At the present day, a blasting system of ANFO using a loading machine has been introduced recently for a tunnel blasting. However, ANFO has some problems, such as a useless explosive in wet boreholes, bad blasting fume and producing the ammonia gas due to the decomposition of ammonium nitrate in contact with the sprayed concrete in tunnel.

A blasting system using bulk emulsion explosives with loading machine has been used practically in the world. However, it is difficult to introduce this system to Japanese tunneling because of the Japanese Explosives Control Law. Also, bulk emulsion explosives need complicated loading machine for chemical gassing. Therefore, we, Nippon Kayaku Co., Ltd has developed granular emulsion explosives with the development concept, which has explosive properties of emulsion explosives and handling property similar to ANFO. And the field blasting tests were carried out to confirm actual operations and blasting effects in some tunnels. As a result of the field tests, the loading time of explosives can be reduced. The cycle time of blasting operation is less than that of cartridged explosive products, and blasting fume are much better than that of ANFO.

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Granular emulsion explosives, Loading machine, ANFO

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