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http://dx.doi.org/10.7843/kgs.2021.37.10.13

The Study on Blast Effects of Stemming Materials by Trauzl Lead Block Test and High Speed 3D-DIC Systems  

Ko, Younghun (Dept. of Geotechnical Engineering Research (GER), Korea Institute of Civil Engineering and Building Technology (KICT))
Seo, Seunghwan (Dept. of GER, KICT)
Kim, Sik (Seokseong Blasting Construction Co., Ltd.)
Chung, Youngjun (Seokseong Blasting Construction Co., Ltd.)
Chung, Moonkyung (Dept. of GER, KICT)
Publication Information
Journal of the Korean Geotechnical Society / v.37, no.10, 2021 , pp. 13-25 More about this Journal
Abstract
The most widely used method for determining the blast effects of explosives is the Trauzl test. This test is used to measure the explosive power (strength) of a substance by determining volume increase, which is produced by the detonation of a tested explosive charge in the cavity of a lead block with defined quality and size. In this paper, Trauzl lead block test and High speed 3D-DIC (Digital Image Correlation) system were conducted to evaluate the stemming effect of the blast hole. The effects of stemming materials can be expressed as the expansion of the cavity in a standard lead block through explosion of the explosives. The blasting experiment was conducted with emulsion explosives. The stemming material in the blast hole of lead block, which was adopted in this study, were using sand and stone chips. Results of blasting experiment and numerical analysis showed that the expansion rates of lead block were most affected by stone chips followed by sand. Also, as result of dynamic strain measurement on the lead block surface of High speed 3D-DIC system, the displacement and surface strain on the block were the highest in the experiment case of stone chips stemming.
Keywords
Trauzl lead block test; High speed 3D-DIC; Stemming materials; Sand and stone chips;
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