2024-07-17 ロイヤルメルボルン工科大学(RMIT)
The spear can be fitted with a range of tips, including this spherical penetrometer. Credit: RMIT.
＜関連情報＞
- https://www.rmit.edu.au/news/all-news/2024/june/speargun
- https://cdnsciencepub.com/doi/10.1139/cgj-2023-0732
土壌におけるスピアガン弾貫入試験機の開発 Development of a Speargun Projectile Penetrometer in Soil
Junlin Rong, Master of Engineering junlin.rong@rmit.edu.au, Majidreza Nazem, Shiao Huey Chow, Annan Zhou, and Sara Moridpour
Canadian Geotechnical Journal Published:5 June 2024
DOI:https://doi.org/10.1139/cgj-2023-0732
Abstract
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 speargun projectile penetrometer, allowing for exploration beyond the boundaries of traditional penetrometers in laboratory testing and offshore site investigation.
