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Descripción
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| This work shows a procedure to estimate errors in peak particle velocity and máximum spectral amplitude based on the distribution of the sample errors (i.e. relative uncertainties). The implications of these errors in the assessment of compliance with vibrations from blasting standards are also highlighted. A dataset comprised by 289 events from 69 blasts carried out in three sites is used; four coupling methods of the transducers to ground and three orientation techniques of the sensors to the blast are studied. Vibrations were monitored in each blast, with 2 to 6 tri-axial geophones or accelerometers positioned close each other, and mounted on rock or soil with the same method for all. Errors are sensitive to both the attachment and orientation conditions for the horizontal (i.e. longitudinal and transversal) components of the ground motion, whereas they depend only on the coupling method for the vertical component and the modulus of the particle velocity. The lowest errors, as expected, are obtained with good geophone-to ground-coupling and accurate orientation of the longitudinal sensors towards the blast; they can be as low as 4.6% for the peak particle velocity and 3.9% for the máximum spectral amplitude. The highest errors correspond to poor sensor-to-ground coupling or poor sensor orientation (which are sometimes the conditions in ordinary vibration monitoring in quarries and construction work); they are as high as 19.7% for the peak particle velocity and 34.9% for the maximum spectral amplitude. | |
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Internacional
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Si |
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Nombre congreso
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10th International Symposium on Rock Fragmentation by Blasting (FRAGBLAST 10) |
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Tipo de participación
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960 |
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Lugar del congreso
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Nueva Delhi, india |
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Revisores
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Si |
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ISBN o ISSN
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9780415621434 |
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DOI
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Fecha inicio congreso
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26/11/2013 |
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Fecha fin congreso
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29/11/2013 |
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Desde la página
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349 |
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Hasta la página
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356 |
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Título de las actas
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Rock Fragmentation by Blasting |