Proceedings of the Earthquake Engineering Society of Korea Conference (한국지진공학회:학술대회논문집)
- 1999.04a
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- Pages.85-92
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- 1999
Evaluating Blasting Induced Damages of Granite
발파에 의한 화강암반의 손상평가
Abstract
Blasting induced damage boundary was determined by measuring vibrations adjacent to charging holes. the criterion adopted to define damages is that blasting-induced strains exceeding tension-crack strain level cause damages. The blasting vibrations were measured in terms of acceleration and converted to strains. The tension-crack strain level was determined with tensile strengths and elastic moduli of rock cores. The damage zone was found to be extended radially about 1 meter from the blasthole detonated with 250 to 700 grams of explosives. The comparison of shear wave velocity profiles before and after blasting shows that the damage boundary of 1 meter seems to be reliable.
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