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http://dx.doi.org/10.9711/KTAJ.2017.19.6.959

Propagation characteristics of blast-induced vibration to fractured zone  

Ahn, Jae-Kwang (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Park, Duhee (Dept. of Civil and Environmental Engineering, Hanyang University)
Park, Ki-Chun (Dept. of Civil and Environmental Engineering, Hanyang University, BMSENC Co. Ltd.)
Yoon, Ji Nam (Dept. of Civil and Environmental Engineering, Hanyang University, Infra Division Sr. POSCO E&C)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.19, no.6, 2017 , pp. 959-972 More about this Journal
Abstract
In evaluation of blast-induced vibration, peak particle velocity (PPV) is generally calculated by using attenuation relation curve. Calculated velocity is compared with the value in legal requirements or the standards to determine the stability. Attenuation relation curve varies depending on frequency of test blasting, geological structure of the site and blasting condition, so it is difficult to predict accurately using such an equation. Since PPV is response value from the ground, direct evaluation of the structure is impractical. Because of such a limit, engineers tend to use the commercial numerical analysis program in evaluating the stability of the structure more accurately. However, when simulate the explosion process using existing numerical analysis program, it's never easy to accurately simulate the complex conditions (fracture, crushing, cracks and plastic deformation) around blasting hole. For simulating such a process, the range for modelling will be limited due to the maximum node count and it requires extended calculation time as well. Thus, this study is intended to simulate the elastic energy after fractured zone only, instead of simulating the complex conditions of the rock that results from the blast, and the analysis of response characteristics of the velocity depending on shape and size of the fractured zone was conducted. As a result, difference in velocity and attenuation character were calculated depending on fractured zone around the blast source appeared. Propagation of vibration tended to spread spherically as it is distanced farther from the blast source.
Keywords
Blast vibration; Attenuation curve; Blast source; Fractured zone; Numerical analysis;
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Times Cited By KSCI : 3  (Citation Analysis)
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