Characteristics of the blast pressure by the difference in fracture situation in the reinforced concrete (RC) wall

被引:0
作者
Nishino, Kana [1 ]
Kubota, Shiro [2 ]
Wada, Yuji [2 ]
Ogata, Yuji [2 ]
Ito, Norio [3 ]
Nagano, Masayuki [3 ]
Nakamura, Satoki [4 ]
Kumasaki, Mieko [1 ]
机构
[1] Yokohama Natl Univ, Hodogaya Ku, 79-7 Tokiwadai, Yokohama, Kanagawa 2408501, Japan
[2] Natl Inst Adv Ind Sci & Technol, Res Inst Sci Safety & Sustainabil RISS, 16-1 Onogawa, Tsukuba, Ibaraki 3058569, Japan
[3] Sagami Kogyo Co Ltd, Chuo Ku, 1-3-12 Yoshinodai, Sagamihara, Kanagawa 2520222, Japan
[4] Kayaku Japan Co Ltd, Sumida Ku, KFC Bldg 9F,1-6-1 Yokoami, Tokyo 1300015, Japan
关键词
blast pressure; small-scale blasting; fracture type; borehole side; blasting sheet; NUMERICAL-SIMULATION; WAVE; EXPLOSION; MAGAZINE;
D O I
暂无
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
This study focuses on the blast pressure characteristics of small-scale blasting in rescue work. It was found that the peak overpressure at the borehole side was larger than that at the back side in the single-charge experiments. The peak overpressure for a Type A fracture, which created a crater only at the borehole side, was larger than the peak overpressure of a Type B fracture. Since a Type B fracture generates craters on both sides of the wall, it was expected that more energy would be expended in fracturing the wall than in Type A. However, the peak overpressure at the back side in our experiments was nearly the same in Type A and B fractures. The effectiveness of a blasting sheet in reducing peak overpressure at the borehole side was evaluated in model disaster scene experiments. The blasting sheet decreased peak overpressure by approximately 80% compared to when no blasting sheet was used, for the largest peak overpressure, occurring at a scaled distance of 3.5 m.kg(-1/3). We set a safety standard for overpressure in small-scale blasting, based on the results of previous studies. We observed that peak overpressure was much lower than this safety standard when the blasting sheet was used.
引用
收藏
页码:124 / 129
页数:6
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