Penetration Behavior and Sample Quality of Hydraulically Activated Fixed-Piston Samplers
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 3
Abstract
This study presents an enhanced hydraulic fixed-piston (HNS-N) sampler that reflects a local practice. This sampler was employed at a deltaic site along with two other types of samplers: a similar hydraulic (HNS-K) type with no vacuum breaker and an oil-operated (ONS) sampler that is equipped with a vacuum breaker and is fixed at the center of a casing. The generation of a slowly but erratically increasing pressure in the hydraulic samplers often does not ensure constant speed and full penetration; thus, the pressure in these samplers was increased rapidly after the drill rods were filled with water. By contrast, the pressure in the ONS sampler was increased instantaneously. The hydraulic samplers exhibited slightly discrete penetration behavior, whereas the ONS sampler induced constant penetration. The sample qualities of the samplers are ordered based on an evaluation via two nondestructive methods and a consolidation test, as follows: . The sample quality was affected significantly by the uniformity of penetration behavior and slightly by the penetration rate (mostly ). In addition, sample quality was strongly influenced by the use of the vacuum breaker.
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Acknowledgments
This work was supported by the Korea Science and Engineering Foundation (KOSEF) Research Program grant funded by the Korean government (MEST) (No. 2016R1A2A2A05005131) and by the graduate students at Dong-A University, Busan, Korea.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 3 • March 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Oct 2, 2015
Accepted: Jul 7, 2016
Published online: Sep 9, 2016
Discussion open until: Feb 9, 2017
Published in print: Mar 1, 2017
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