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Science and Technology of Energetic Materials

Vol.80, No.1 (2019)

Research paper

Evaluation of the crater size in the reinforced concrete (RC) wall by small-scale blasting
Kana Nishino, Shiro Kubota, Yuji Wada, Yuji Ogata, Norio Ito, Masayuki Nagano, Satoki Nakamura, and Mieko Kumasaki
p.23-27

Abstract

This study focuses on the depth of the crater size by small-scale blasting to determine suitable charge conditions for rescue work that requires creating a rescue route through various thicknesses of reinforced concrete (RC) wall. In this study, the amount of explosive and borehole depth as conditions for small-scale blasting experiments were varied depending on fixed diameter, angle of borehole, and stemming material. The fracture performance was defined as the ratio of generated crater depth to its borehole depth to estimate a fracture. The fracture performance was used to select the optimal borehole depths for each wall between 250 and 150 mm of thickness increasing by 5 mm. After the optimal borehole depths were obtained, the explosion tests were conducted to determine the adequate amount of explosive per hole. Based on the experiments, the proper conditions were obtained to control a fracture by selecting a suitable amount of explosive. Thus, the charge condition of small-scale blasting for rescue work was presented using sets of borehole depth and amount of explosive per hole.

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Keywords

crater depth, charge condition, fracture performance, borehole depth, amount of explosive per hole

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