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Descripción
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| Suggested methods for blast vibration monitoring generally assume that the vibration mount follows the ground motion whenever the expected vibrations are lower than a certain limit. However the error committed with these methods is currently unknown. To investigate this, results from 53 trials made on a vibration exciter are considered. The rock-to-mount, or coupling, transmissibility (i.e. ratio of the velocity of the sensor mount to the velocity of the base motion) was measured from 2 to 200 Hz, at two vibration levels (5 and 20 mm/s) using five methods, namely: freely laid, sandbagged, anchored, glued and plastered mounts. Free and sandbagged mounts lead to a weak coupling with errors depending on the measuring conditions, i.e. frequency, velocity and characteristics of the vibration mounts. Measurements were only accurate at low frequencies (below 15 Hz) in the tested conditions (velocities up to 20 mm/s). Above this frequency, where the accelerations of the ground motion are in line with values suggested by field guidelines, errors are significant. Anchored, glued, and plastered mounts allow stiff rock-to-ground coupling, ensuring consistent measurements for the frequencies commonly found in blasting, independently of the vibration level and the mount characteristics. | |
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Internacional
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Si |
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ISSN o ISBN
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978-605-01-0787-6 |
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Entidad relacionada
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Chamber of Mining Enginners of Turkey |
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Nacionalidad Entidad
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TURQUIA |
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Lugar del congreso
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Estambul, Turquia |