Development of a speargun projectile penetrometer in soil

This study investigates the applicability of a speargun projectile penetrometer (SPP) for offshore site investigation purposes using experimental testing. The SPP can shoot penetrometers using an elastic/pneumatic force. The speargun is easy to handle, can generate significant kinetic energy, and re...

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Veröffentlicht in:Canadian geotechnical journal 2024-11, Vol.61 (11), p.2588-2592
Hauptverfasser: Rong, Junlin, Nazem, Majidreza, Chow, Shiao Huey, Zhou, Annan, Moridpour, Sara
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Sprache:eng
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Zusammenfassung:This study investigates the applicability of a speargun projectile penetrometer (SPP) for offshore site investigation purposes using experimental testing. The SPP can shoot penetrometers using an elastic/pneumatic force. The speargun is easy to handle, can generate significant kinetic energy, and requires a single operator to perform the test. A laboratory test platform was utilised to hold the SPP and ensure vertical launch, while a laser displacement sensor was employed to monitor the penetration depth and record the corresponding time history. The result demonstrated that the speargun-launched method achieves significantly higher embedment depth compared to an equivalent free-falling penetrometer. In particular, the new method produces sufficiently deep penetration in dense sand, thus overcoming the typical penetrometer tilting issue caused by shallow penetration. These findings provide a preliminary insight into the SPP, allowing for exploration beyond the boundaries of traditional penetrometers in laboratory testing and offshore site investigation.
ISSN:0008-3674
1208-6010
DOI:10.1139/cgj-2023-0732