Transition of soil friction during suction pile installation

Cho, Y; Bang, S.; Preber, T

doi:10.1139/t02-054

Cited by 9 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The considerable costs of field trials also limit the variations of different installation parameters during tests. To overcome the cost problem, many installation studies have been conducted by means of cheaper and more flexible smallscale model tests (Allersma et al, 1997;Cho et al, 2002;Allersma, 2003;Tran et al, 2004), where changes in installation conditions can be made easily. However, interpretation of suction pressures during installation, either in the field or in model studies, has not been addressed adequately so far.…”

Section: Introductionmentioning

confidence: 99%

Variation of suction pressure during caisson installation in sand

Tran

Randolph

2008

Géotechnique

View full text Add to dashboard Cite

A series of model tests was conducted in a geotechnical centrifuge to investigate the variation of suction pressure during caisson installation in dense sand. The tests were carried out for caissons of different size and surcharge (or effective weight). Finite element (FE) simulations were also conducted to study and explain the experimental results. Data from two field installations and other model tests were investigated, and compared with the results from the centrifuge model tests. The suction pressure was observed to increase relatively linearly with embedment depth, following a distinct slope that is related to establishing a critical hydraulic gradient along the inner caisson wall. The total driving force (weight plus pressure differential) required for suction installation is significantly reduced compared with the force required to install the caisson by jacking. When a larger surcharge was used, the required suction pressure decreased for a given penetration depth, but the total force increased. By contrast, the initial caisson penetration depth did not appear to have any effect on the required suction pressure. The overall behaviour and the pressure variation with depth were similar for caissons of different sizes, and wall thickness. Subsequent FE analyses appeared to explain this observation well, and a consistent pattern of behaviour was established for all the model and field data.On a effectué une série d'essais sur maquette dans une centrifuge géotechnique, pour examiner la variation de pression d'aspiration lors de l'installation de caissons dans du sable dense. Ces tests ont été effectués sur des caissons de taille et surcharge (ou poids effectif) diverses. On a égale-ment procédé à des simulations aux éléments finis pour étudier et expliquer les résultats expérimentaux. On a examiné des données provenant de deux installations sur le terrain et d'autres essais sur maquette, pour les comparer avec les résultats des essais centrifuges sur maquette. On a remarqué que la pression d'aspiration augmentait de façon relativement linéaire en fonction de la profondeur d'enfouissement, en suivant une pente distincte en rapport avec l'établissement d'un gradient hydraulique critique le long de la paroi interne du caisson. La force d'entraînement totale (poids plus différence de pression) requise pour l'installation d'aspiration est fort inférieure à la force requise pour installer le caisson au moyen de vérins. Lorsqu'on utilise une surcharge supérieure, la pression d'aspiration requise diminuait pour une certaine profondeur de pénétration, tandis que la force totale augmentait. Au contraire, la profondeur de pénétration initiale du caisson ne semblait avoir aucun effet sur la pression d'aspiration requise. Le comportement général et la variation de la pression en fonction de la profondeur étaient similaires pour des caissons de tailles et épaisseur de paroi diverses. Des analyses aux éléments finis, effectuées pas la suite, semblent bien expliquer cette observation, et on a établi une tendance régulière d...

show abstract

Section: Introductionmentioning

confidence: 99%

Variation of suction pressure during caisson installation in sand

Tran

Randolph

2008

Géotechnique

View full text Add to dashboard Cite

show abstract

“…These variations of the suction pressure during installation and the positive pressure during retrieval have been observed from previous field tests (5,6). The plots shown in Figures 8 and 9 will be used in the future to further validate the analytical solutions for the suction pile installation and retrieval already developed by the authors (4,6). The analytical solutions use the concept of the mobilized soil strength ratio.…”

Section: Test Resultsmentioning

confidence: 97%

“…The mobilized soil strength ratio is the soil strength necessary for the equilibrium between the externally applied force through suction/positive pressure and the pile resistance divided by the fully available soil strength. Previous field and laboratory model tests (1,(3)(4)(5)(6) indicated that the mobilized soil strength ratio increases during installation as the pile penetrates into the sea floor and becomes larger as the pile diameter gets smaller. However, during retrieval, the mobilized soil strength ratio increases as the pile is pulled out and becomes larger as the pile diameter increases.…”

Section: Test Resultsmentioning

confidence: 99%

Field Installation and Pullout Test of Embedded Suction Anchors

Bang

Boonyong

Cho

2005

Transportation Research Record: Journal of the Transportation R

View full text Add to dashboard Cite

The field installation and pullout tests of an embedded suction anchor were conducted inside the Okpo Harbor located along the southeastern coast of South Korea in 2003. The embedded suction anchor was made of steel with an outside diameter of 1.91 m, length of 2.5 m, and thickness of 3 cm. It was installed by a 9.25-m-long suction pile attached at the top of the anchor. During installation of the embedded suction anchor and retrieval of the suction pile, the water pressure inside the suction pile versus the pile embedded length relationship was carefully measured. In addition, during the embedded suction anchor pullout test, the load versus anchor vertical displacement relationship was measured. The measured pullout capacity was then compared with the analytical prediction. The analytical solution was selected from various available solutions of deeply embedded plate anchors available from the literature through detailed comparisons with the results from geotechnical centrifuge model tests on embedded suction anchors. Comparison indicated that the predicted embedded suction anchor resistance matched reasonably well with the field test result.

show abstract

“…Complete details of the suction pile design, considering the external loads and safe installation, are beyond the scope of this paper. They are well described in references [4,5,6,7,8,9]. From September through late November 2004, four suction piles were fabricated at a location adjacent to the wharf near the test site.…”

Section: Suction Pile Details and Installationmentioning

confidence: 99%

Design and Installation of Suction Piles for Breakwater Foundation

Bang

Cho²,

Kwag³

Proceedings of OCEANS 2005 MTS/IEEE

View full text Add to dashboard Cite

A new breakwater system, utilizing gravity-type concrete caisson superstructure on top of suction piles that act as the subsurface foundations, was designed and successfully installed in the field as part of an experimental project in 2004. The design utilized two concrete suction piles in a row with the diameter of 11 meters each. Four suction piles will support a 17.4 meter by 21.0 meter concrete caisson on top. Instrumentation during installation included the measurements of the suction pressure, pile penetration, and pile tilts.

show abstract

Transition of soil friction during suction pile installation

Cited by 9 publications

References 4 publications

Variation of suction pressure during caisson installation in sand

Variation of suction pressure during caisson installation in sand

Field Installation and Pullout Test of Embedded Suction Anchors

Design and Installation of Suction Piles for Breakwater Foundation

Contact Info

Product

Resources

About