Measurements of two types of dilatational waves in an air-filled unconsolidated sand
作者:
Craig J. Hickey,
James M. Sabatier,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1997)
卷期:
Volume 102,
issue 1
页码: 128-136
ISSN:0001-4966
年代: 1997
DOI:10.1121/1.419770
出版商: Acoustical Society of America
关键词: SAND;SOUND WAVES;WAVE PROPAGATION;MEASURING METHODS;ATTENUATION;TRANSDUCERS;POROUS MATERIALS;PHASE VELOCITY
数据来源: AIP
摘要:
This study consists of laboratory measurements of dilatational waves propagating through an air-filled unconsolidated sand. One excitation technique consists of a loudspeaker suspended in the air above the packing of sand. A second excitation technique uses a mechanical shaker in contact with the sand. The transmitted signals are received using microphones and geophones located at various depths within the sand. An interpretation based on measured phase speeds indicates that the transmitted energy from the suspended loudspeaker source is partitioned primarily but not exclusively into the type-II dilatational wave. This wave attenuates rapidly and is only detected at depths of less than about 15 cm for this particular sample. At the deeper depths the detected signal is associated with the type-I dilatational wave. The mechanical shaker produces only a type-I dilatational wave. Both the geophone and microphone sensors can detect both types of dilatational waves.
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