Documents disponibles écrits par cet auteur

Full-scale testing of open-ended steel pipe piles in thick varved clayey silt deposits along the delaware river in New Jersey / Yong Tan in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 3 (Mars 2013) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 518-524 Titre : Full-scale testing of open-ended steel pipe piles in thick varved clayey silt deposits along the delaware river in New Jersey Type de document : texte imprimé Auteurs : Yong Tan, Auteur ; Guoming Lin, Auteur Année de publication : 2013 Article en page(s) : pp. 518-524 Note générale : geotechnique Langues : Anglais (eng) Mots-clés : pipe  piles;  steel  piles;  clays;  silts;  compression;  load  tests;  design;  New  Jersey;  full-scale  tests Résumé : Although many studies have been done to investigate the axial behaviors of open-ended piles in sands, few studies have been reported for weak clayey silts. To develop reliable models for the design of open-ended steel-pipe piles driven into 29-m-thick varved clayey silt deposits, a series of full-scale field load tests including large-strain dynamic tests and static cyclic axial-compression-load tests was conducted on two groups of instrumented piles. Through analysis of the test data, soil parameters were back-calculated for estimation of pile capacities using the static-bearing-capacity formulas and cone-resistance-based methods. The comparisons between the calculated results and the field load test data demonstrated that the following considerations can be adopted in the design of static compression capacities of an open-ended pipe pile penetrating through thick varved clayey silts to end-bearing in dense cohesionless soils: (1) a fully plugged condition can be assumed, (2) cone resistance with an upper limit of 4,788 kPa (100 ksf) can be used for unit base resistance on the soil plug, and (3) exterior unit shaft resistance can be estimated using two-thirds of the total unit shaft resistance. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000777 [article] Full-scale testing of open-ended steel pipe piles in thick varved clayey silt deposits along the delaware river in New Jersey [texte imprimé] / Yong Tan, Auteur ; Guoming Lin, Auteur . - 2013 . - pp. 518-524. geotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 518-524 Mots-clés : pipe  piles;  steel  piles;  clays;  silts;  compression;  load  tests;  design;  New  Jersey;  full-scale  tests Résumé : Although many studies have been done to investigate the axial behaviors of open-ended piles in sands, few studies have been reported for weak clayey silts. To develop reliable models for the design of open-ended steel-pipe piles driven into 29-m-thick varved clayey silt deposits, a series of full-scale field load tests including large-strain dynamic tests and static cyclic axial-compression-load tests was conducted on two groups of instrumented piles. Through analysis of the test data, soil parameters were back-calculated for estimation of pile capacities using the static-bearing-capacity formulas and cone-resistance-based methods. The comparisons between the calculated results and the field load test data demonstrated that the following considerations can be adopted in the design of static compression capacities of an open-ended pipe pile penetrating through thick varved clayey silts to end-bearing in dense cohesionless soils: (1) a fully plugged condition can be assumed, (2) cone resistance with an upper limit of 4,788 kPa (100 ksf) can be used for unit base resistance on the soil plug, and (3) exterior unit shaft resistance can be estimated using two-thirds of the total unit shaft resistance. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000777

Isolation of DDC impact to sheet pile walls by open trenches / Yong Tan in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 1 (Janvier 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 1 (Janvier 2012) . - pp. 110-114 Titre : Isolation of DDC impact to sheet pile walls by open trenches Type de document : texte imprimé Auteurs : Yong Tan, Auteur ; Ye Lu, Auteur ; Fangle Peng, Auteur Année de publication : 2012 Article en page(s) : pp. 110-114 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : DDC  Dynamic  approach  Open  trench  Sheet  pile  wall  Deflection  Isolation Résumé : This paper investigates the effectiveness of open trenches in reducing the deflections of sheet pile walls during deep dynamic compaction (DDC). This investigation included a series of comprehensive parametric studies using a two-dimensional (2D) finite-element (FE) method. Prior to investigation, a new dynamic approach based on the time history of tamper penetration depth was developed to simulate DDC impact, and its reliability and accuracy were verified by field measurements. Then, three open trenches with different cross-section shapes were examined. The dimensional effects of the trenches on reducing wall deflections were analyzed and discussed, and their reduction efficiencies were compared. For the investigated shallow open trenches, increasing trench depth or width can efficiently improve their isolation effects on reducing wall deflections. The cross-section shapes of open trenches do not impose apparent influences. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i1/p110_s1?isAuthorized=no [article] Isolation of DDC impact to sheet pile walls by open trenches [texte imprimé] / Yong Tan, Auteur ; Ye Lu, Auteur ; Fangle Peng, Auteur . - 2012 . - pp. 110-114. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 1 (Janvier 2012) . - pp. 110-114 Mots-clés : DDC  Dynamic  approach  Open  trench  Sheet  pile  wall  Deflection  Isolation Résumé : This paper investigates the effectiveness of open trenches in reducing the deflections of sheet pile walls during deep dynamic compaction (DDC). This investigation included a series of comprehensive parametric studies using a two-dimensional (2D) finite-element (FE) method. Prior to investigation, a new dynamic approach based on the time history of tamper penetration depth was developed to simulate DDC impact, and its reliability and accuracy were verified by field measurements. Then, three open trenches with different cross-section shapes were examined. The dimensional effects of the trenches on reducing wall deflections were analyzed and discussed, and their reduction efficiencies were compared. For the investigated shallow open trenches, increasing trench depth or width can efficiently improve their isolation effects on reducing wall deflections. The cross-section shapes of open trenches do not impose apparent influences. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i1/p110_s1?isAuthorized=no

Observed behaviors of a long and deep excavation constructed by cut-and-cover technique in shanghai soft clay / Yong Tan in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 1 (Janvier 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 1 (Janvier 2012) . - pp. 69-88 Titre : Observed behaviors of a long and deep excavation constructed by cut-and-cover technique in shanghai soft clay Type de document : texte imprimé Auteurs : Yong Tan, Auteur ; Bin Wei, Auteur Année de publication : 2012 Article en page(s) : pp. 69-88 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Long  and  deep  excavation  Soft  clay  Field  measurement  Time  effects  Length  effects  Postexcavation Résumé : A 16–18 m deep excavation for a metro station with in-plane dimensions of approximately 20 m wide by 290 m long was constructed by using the cut-and-cover technique in soft clay in the Shanghai metropolitan area, in which many high-rise buildings and utilities exist. To investigate the performance of this deep excavation and the associated effect on the adjacent buildings and utility pipelines, a long-term comprehensive instrumentation program was conducted during construction. Field observations included deflections of diaphragm walls, vertical movements at wall tops, ground settlements, and settlements of surrounding buildings and utilities. Analyses of field data indicated that overexcavation (i.e., removing more soil than designed) and a long construction duration caused the diaphragm walls to develop substantial deflections. The base and middle floor slabs played dominant roles in suppressing postexcavation wall deflections and ground settlements. This excavation in general exhibited different behaviors than other excavation projects because of its relatively long shape. Behaviors of deep excavations in Shanghai soft clay are affected not only by construction duration (i.e., time effects), but also by their geometries (i.e., space effects). This project serves as a special case study and provides insights into the design and construction of a long and deep excavation that uses the cut-and-cover technique in soft soils and in a metropolitan environment. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i1/p69_s1?isAuthorized=no [article] Observed behaviors of a long and deep excavation constructed by cut-and-cover technique in shanghai soft clay [texte imprimé] / Yong Tan, Auteur ; Bin Wei, Auteur . - 2012 . - pp. 69-88. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 1 (Janvier 2012) . - pp. 69-88 Mots-clés : Long  and  deep  excavation  Soft  clay  Field  measurement  Time  effects  Length  effects  Postexcavation Résumé : A 16–18 m deep excavation for a metro station with in-plane dimensions of approximately 20 m wide by 290 m long was constructed by using the cut-and-cover technique in soft clay in the Shanghai metropolitan area, in which many high-rise buildings and utilities exist. To investigate the performance of this deep excavation and the associated effect on the adjacent buildings and utility pipelines, a long-term comprehensive instrumentation program was conducted during construction. Field observations included deflections of diaphragm walls, vertical movements at wall tops, ground settlements, and settlements of surrounding buildings and utilities. Analyses of field data indicated that overexcavation (i.e., removing more soil than designed) and a long construction duration caused the diaphragm walls to develop substantial deflections. The base and middle floor slabs played dominant roles in suppressing postexcavation wall deflections and ground settlements. This excavation in general exhibited different behaviors than other excavation projects because of its relatively long shape. Behaviors of deep excavations in Shanghai soft clay are affected not only by construction duration (i.e., time effects), but also by their geometries (i.e., space effects). This project serves as a special case study and provides insights into the design and construction of a long and deep excavation that uses the cut-and-cover technique in soft soils and in a metropolitan environment. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i1/p69_s1?isAuthorized=no

Performance of sheet pile wall in peat / Yong Tan in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°4 (Avril 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°4 (Avril 2008) . - pp. 445–458 Titre : Performance of sheet pile wall in peat Type de document : texte imprimé Auteurs : Yong Tan, Auteur ; Samuel G. Paikowsky, Auteur Année de publication : 2008 Article en page(s) : pp. 445–458 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Earth  pressure  Sheet  pile  Instrumentation  Finite  element  method  Retaining  walls  Waterfront  structures Résumé : To study the performance of sheet pile wall in peat during roadway construction, a long-term instrumentation program was conducted over a period of two years, measuring total lateral earth pressures, sheet pile deflections, soil movements, and water table level variances during construction. The analysis of field data indicated: (1) The earth pressure distribution in peat matched well with the classic Rankine earth pressure; (2) the expected long-term postconstruction sheet pile movement due to the creep behavior of peat was not observed; (3) fully passive earth pressure in peat was mobilized once the maximum measured sheet pile deflection exceeded 0.8% of sheet pile length; and (4) arching effect due to the protruding cross section of sheet pile caused pressure differences of 3–10kPa between the inside web and outside web of the sheeting. Then, all the construction stages were continuously modeled by finite-element method and the calculated results were compared with the field measurements. The comparisons showed that the calculated results were consistent with the field data and provided reasonable explanations and helpful insights to understand soil–structure interaction mechanism. Finally, some conclusions and suggestions for sheet pile design and construction in peat were reached. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A4%2844 [...] [article] Performance of sheet pile wall in peat [texte imprimé] / Yong Tan, Auteur ; Samuel G. Paikowsky, Auteur . - 2008 . - pp. 445–458. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°4 (Avril 2008) . - pp. 445–458 Mots-clés : Earth  pressure  Sheet  pile  Instrumentation  Finite  element  method  Retaining  walls  Waterfront  structures Résumé : To study the performance of sheet pile wall in peat during roadway construction, a long-term instrumentation program was conducted over a period of two years, measuring total lateral earth pressures, sheet pile deflections, soil movements, and water table level variances during construction. The analysis of field data indicated: (1) The earth pressure distribution in peat matched well with the classic Rankine earth pressure; (2) the expected long-term postconstruction sheet pile movement due to the creep behavior of peat was not observed; (3) fully passive earth pressure in peat was mobilized once the maximum measured sheet pile deflection exceeded 0.8% of sheet pile length; and (4) arching effect due to the protruding cross section of sheet pile caused pressure differences of 3–10kPa between the inside web and outside web of the sheeting. Then, all the construction stages were continuously modeled by finite-element method and the calculated results were compared with the field measurements. The comparisons showed that the calculated results were consistent with the field data and provided reasonable explanations and helpful insights to understand soil–structure interaction mechanism. Finally, some conclusions and suggestions for sheet pile design and construction in peat were reached. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A4%2844 [...]