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Oil-operated fixed-piston sampler and its applicability / S. G. Chung in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 1 (Janvier 2013) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 134-142 Titre : Oil-operated fixed-piston sampler and its applicability Type de document : texte imprimé Auteurs : S. G. Chung, Auteur ; H. J. Kweon, Auteur Année de publication : 2013 Article en page(s) : pp. 134-142 Note générale : geotechnqiue Langues : Anglais (eng) Mots-clés : clays;  sampling;  soil  suction;  shear  modulus;  soil  consolidation Résumé : This paper presents the development of an oil-operated fixed-piston sampler. This sampler includes a vacuum breaker, which prevents the suction between the sample and piston during disassembly, and an improved version of a complex system used for continuous advancement in mechanical samplers. The improvement makes the new sampler easy to operate, similar to the hydraulic sampler. The oil-operated and hydraulic samplers were used at a site in the Nakdong River Delta. Suction, shear-wave velocity, and consolidation tests were performed on 100-mm-long specimens equally divided by the extruded samples, as well as the seismic flat dilatometer and the piezocone tests in the field. The results show that the new sampler gave better sample quality than the hydraulic-type sampler, indicating better recovery ratio. The main difference in sample quality between the two samplers can be attributed to mechanical destructuration, owing to the stepped advancement and the slight tilt of the hydraulic sampler. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000730 [article] Oil-operated fixed-piston sampler and its applicability [texte imprimé] / S. G. Chung, Auteur ; H. J. Kweon, Auteur . - 2013 . - pp. 134-142. geotechnqiue Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 134-142 Mots-clés : clays;  sampling;  soil  suction;  shear  modulus;  soil  consolidation Résumé : This paper presents the development of an oil-operated fixed-piston sampler. This sampler includes a vacuum breaker, which prevents the suction between the sample and piston during disassembly, and an improved version of a complex system used for continuous advancement in mechanical samplers. The improvement makes the new sampler easy to operate, similar to the hydraulic sampler. The oil-operated and hydraulic samplers were used at a site in the Nakdong River Delta. Suction, shear-wave velocity, and consolidation tests were performed on 100-mm-long specimens equally divided by the extruded samples, as well as the seismic flat dilatometer and the piezocone tests in the field. The results show that the new sampler gave better sample quality than the hydraulic-type sampler, indicating better recovery ratio. The main difference in sample quality between the two samplers can be attributed to mechanical destructuration, owing to the stepped advancement and the slight tilt of the hydraulic sampler. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000730