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Descripción
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| Vibrations from blasting were measured with two or three tri-axial transducers mounted side by side in 37 blasts. The sensors were anchored or sandbagged to the rock. They were oriented towards the blast using three methods, namely: accurate orientation with total station (with bearing errors of only few degrees), visual orientation and wrong orientation (with an intentional bearing error of about ±30º). Uncertainties are described by the relative standard error of the mean, and they have been calculated for peak particle velocity and maximum spectral amplitude. The resulting uncertainties show, on the one hand, that vibration measurements can be quite precise if the sensors are anchored and pointed accurately to the blast, which gives a quantitative statement of the unavoidable experimental errors, and on the other, that higher errors can be incurred when vibrations are not properly measured. The mean uncertainty of carefully implemented measurements (good sensor-to-ground coupling and accurate orientation) can be as low as 2.5 % for the peak particle velocity and 1.1 % for the maximum spectral amplitude; for measurements with poor sensor-to-ground coupling or poor sensor orientation (which are sometimes the conditions in ordinary vibration monitoring in quarries and construction works), the mean uncertainty can be as high as 8.2 % for the peak particle velocity and 15.8 % for the maximum spectral amplitude. The implications of these uncertainties in the assessment of compliance with vibrations from blasting standards are highlighted. | |
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Internacional
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Si |
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JCR del ISI
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Si |
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Título de la revista
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ROCK MECHANICS AND ROCK ENGINEERING |
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ISSN
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0723-2632 |
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Factor de impacto JCR
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1,19 |
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Información de impacto
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Volumen
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45 |
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DOI
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10.1007/S00603-012-0229-Y |
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Número de revista
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6 |
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Desde la página
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1119 |
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Hasta la página
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1126 |
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Mes
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JUNIO |
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Ranking
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9 de 30 ENGINEERING, GEOLOGICAL (tercil T1) |