University of Oulu

Zhang, ZX., Chi, L.Y. & Zhang, Q. Effect of Specimen Placement on Model Rock Blasting. Rock Mech Rock Eng 54, 3945–3960 (2021).

Effect of specimen placement on model rock blasting

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Author: Zhang, Zong-Xian1; Chi, Li Yuan2; Zhang, Qingbin3
Organizations: 1Oulu Mining School, University of Oulu, Oulu, Finland
2State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, China
3School of Civil Engineering, Changsha University of Science and Technology, Changsha, China
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.7 MB)
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Language: English
Published: Springer Nature, 2021
Publish Date: 2021-09-02


Small-scale model blasting plays an important role in understanding mechanism of rock fragmentation by blasting and improving blast technology in rock and mining engineering. Because a specimen (or model) often needs to be placed on either a ground or another material in model blasting, an additional interface appears between the specimen and the ground (or material), compared with an engineering blast that does not have such an interface. In this paper, four model blasts with high-speed photography were presented. The results showed that: (1) as the impedance of a rock specimen was smaller than that of the ground material, the specimen was thrown up and a certain amount of kinetic energy was brought with such a bounce. Thus, this placement should be avoided in model blasts. (2) As a rock specimen was placed on three blocks of the same type of rock as the specimen the specimen was not bounced up during blasting. Correspondingly, no kinetic energy was induced by specimen bounce. Therefore, this placement is recommended for model blasting. If very high specific charge must be used in model blasting, the above-recommended method will not work well due to possible breakage of the base material during blasting. In this case, the rock specimen can be placed on a material with smaller impedance than that of the rock specimen so that specimen bounce can be reduced. Accordingly, such a possible specimen bounce should be estimated by stress wave analysis.

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Series: Rock mechanics and rock engineering
ISSN: 0723-2632
ISSN-E: 1434-453X
ISSN-L: 0723-2632
Volume: 54
Issue: 8
Pages: 3945 - 3960
DOI: 10.1007/s00603-021-02480-5
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
1171 Geosciences
Funding: Open access funding provided by University of Oulu including Oulu University Hospital.
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