Documents disponibles écrits par cet auteur

Hyperbolic method for prediction of prefabricated vertical drains performance / S. G. Chung in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 10 (Octobre 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 10 (Octobre 2009) . - pp. 1519–1528 Titre : Hyperbolic method for prediction of prefabricated vertical drains performance Type de document : texte imprimé Auteurs : S. G. Chung, Auteur ; N. K. Lee, Auteur ; S. R. Kim, Auteur Année de publication : 2009 Article en page(s) : pp. 1519–1528 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Soil  consolidationSettlementEmbankmentsPredictionsCase  studies Résumé : For predicting the settlement rate of a ground area that incorporates prefabricated vertical drains, the hyperbolic method is herein developed based on Barron’s solution and validated by using three documented case studies. This method is suitable within the degrees of consolidation of 60–90%. Results indicate that the estimated coefficients of radial consolidation (Cr) are slightly larger. In two case studies, the estimated Cr values are closer to the coefficients of vertical consolidation obtained from the standard oedometer tests but differ from those values derived from the cone penetration test (CPT) tests. In another case study, where not laboratory results are available, the estimated Cr values fall within a lower bound determined by CPT results. The reason of these differences is due to various factors such as smear and well resistance, the vertical drain type, and its finite drainage capacity. It also appears that, in contrast to the solution obtained by Barron, the settlement versus time curves from the proposed method concur with the monitored curves. Finally, the applicability of the proposed method is discussed based on the case studies. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000042 [article] Hyperbolic method for prediction of prefabricated vertical drains performance [texte imprimé] / S. G. Chung, Auteur ; N. K. Lee, Auteur ; S. R. Kim, Auteur . - 2009 . - pp. 1519–1528. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 10 (Octobre 2009) . - pp. 1519–1528 Mots-clés : Soil  consolidationSettlementEmbankmentsPredictionsCase  studies Résumé : For predicting the settlement rate of a ground area that incorporates prefabricated vertical drains, the hyperbolic method is herein developed based on Barron’s solution and validated by using three documented case studies. This method is suitable within the degrees of consolidation of 60–90%. Results indicate that the estimated coefficients of radial consolidation (Cr) are slightly larger. In two case studies, the estimated Cr values are closer to the coefficients of vertical consolidation obtained from the standard oedometer tests but differ from those values derived from the cone penetration test (CPT) tests. In another case study, where not laboratory results are available, the estimated Cr values fall within a lower bound determined by CPT results. The reason of these differences is due to various factors such as smear and well resistance, the vertical drain type, and its finite drainage capacity. It also appears that, in contrast to the solution obtained by Barron, the settlement versus time curves from the proposed method concur with the monitored curves. Finally, the applicability of the proposed method is discussed based on the case studies. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000042

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

Smear effect and well resistance of PVD-installed ground based on the hyperbolic method / S. G. Chung in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 4 (Avril 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 4 (Avril 2010) . - pp. 640-642 Titre : Smear effect and well resistance of PVD-installed ground based on the hyperbolic method Type de document : texte imprimé Auteurs : S. G. Chung, Auteur ; N. K. Lee, Auteur Année de publication : 2010 Article en page(s) : pp. 640-642 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Prefabricated  vertical  drains  Soil  consolidation  Back-analysis  Discharge  capacity Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : To back analyze the smear effect and well resistance of a ground that incorporates prefabricated vertical drains, a simple method based on the hyperbolic method previously reported and a simplified form of the consolidation solutions were developed. The method was applied to a well-documented case study. The result indicated that the mobilized discharge capacity of the drain obtained by using the theoretically possible ranges of some of main unknown factors considerably agreed with the measured result. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i4/p640_s1?isAuthorized=no [article] Smear effect and well resistance of PVD-installed ground based on the hyperbolic method [texte imprimé] / S. G. Chung, Auteur ; N. K. Lee, Auteur . - 2010 . - pp. 640-642. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 4 (Avril 2010) . - pp. 640-642 Mots-clés : Prefabricated  vertical  drains  Soil  consolidation  Back-analysis  Discharge  capacity Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : To back analyze the smear effect and well resistance of a ground that incorporates prefabricated vertical drains, a simple method based on the hyperbolic method previously reported and a simplified form of the consolidation solutions were developed. The method was applied to a well-documented case study. The result indicated that the mobilized discharge capacity of the drain obtained by using the theoretically possible ranges of some of main unknown factors considerably agreed with the measured result. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i4/p640_s1?isAuthorized=no