Elastic solutions for the design and analysis of rock-socketed piles

Pells, P.J.N.; Turner, R. M.

doi:10.1139/t79-054

Cited by 85 publications

(50 citation statements)

References 6 publications

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“…For pile sockets in rock, the finite element method provides more reliable solutions, e.g. Pells & Turner (1979). The analysis in this section can be used for both the load-transfer analysis (commonly termed the t-z analysis), in which the soil resistance is modelled by a discrete spring at each element, and the continuum analysis, in which the soil is modelled as an elastic continuum.…”

Section: (24mentioning

confidence: 99%

Pile behaviour—theory and application

Poulos

1989

Géotechnique

280

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This paper discusses the application of theory to the analysis of pile foundation behaviour under axial loading. A classification system is suggested for pile analysis and design procedures, based on the rigour of the underlying theory. It is shown that a number of the analyses in use have a common underlying theoretical basis founded on the boundary element method and that such methods give solutions which are consistent with those from other methods such as the finite element method. The main characteristics of pile behaviour are reviewed for single piles and pile groups subjected to static loading, cyclic loading, and to loading arising from externally-imposed soil movements. Correlations are then summarized for the geotechnical parameters required for the prediction of axial pile behaviour. Using characteristic values of these parameters, design charts are developed for the load capacity and settlement of piles and pile groups. Finally, three case studies are described which demonstrate the sensitivity of pile performance predictions to the method of analysis, the idealization of the soil profile, and the selection of soil parameters. It is shown that the method of analysis is likely to have less effect on the predicted performance than does the geotechnical characterization of the site. L'article discute I'application de la thbrie i l'analyse du comportement des fondations par pieux sous chargement axial. On propose un systeme de classification ba& sur la rigueur de la thborie associb pour I'analyse des pieux et les pro&d&s de construction. On dCmontre que quelquesunes des analyses employ&es ont une base thborique commune dbivant de la m6thode des &ments limites et que de telles mbthodes donnent des solutions qui s'accordent bien avec celles obtenues a partir d'autres mbthodes, telles que lea &ments finis. Les caractitristiques principales du comportement des pieux soot examink pour lea pieux et les groupes de pieux soumis aux chargements statiques et cycliques aussi bien qu'au chargement r&&ant des mouvements du sol impo&s de I'extbrieur. Puis on rbume les corrklations pour les param&res gbtechniques &ceasaires pour la pr8 diction du comportement axial des pieux. A I'aide de valeurs caract&istiques de ces parametres on propose des abaques de construction pour la force portante et le tassement des pieux et des groupes de pieux. Trois cas rMs sont p&en&.IIs illustrent la faqon dont les p&lictlons du comportement des pieux dCpendent de la mbthode d'analyse, de la sckmatisation du profil du sol et de la &lection des parametres du sol. On dkmontre que la performance prkvue est probablement moins influencb par la mbthode d'analyse que par la di+ termination des caract&istiques gbtechniques du site.

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Section: (24mentioning

confidence: 99%

Pile behaviour—theory and application

Poulos

1989

Géotechnique

280

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“…This increased to 6.8% after 200 days. For both of these model piers, the load transferred to the pier base is significantly lower than the end-bearing values (20%) predicted using elastic solutions (Pells and Turner 1979). The reasons for the discrepancy are uncertain.…”

Section: Testing Proceduresmentioning

confidence: 71%

“…Consequently, a number of studies have been carried out to examine the influence of various factors on the design, construction, and performance of socketed pier foundations. Analytical studies using finite element techniques have been performed by Coates and Yu (1970), Ellison et al (1971), Osterberg and Gill (1973), Pells and Turner (1979), and Rowe and Armitage (1987a). Instrumented full-scale tests have been carried out by Glos and Briggs (1983), Horvath (1982), Jackson et al (1973), Koutsoftas (1981), and Williams (1980).…”

Section: Introductionmentioning

confidence: 99%

Long-term settlement of model rock-socketed piers

Horvath¹,

Chae²

1989

Can. Geotech. J.

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Very little information is available concerning the long-term settlement behaviour of drilled pier foundations socketed into rock. This paper summarizes the results of laboratory investigations of the long-term settlement (creep) behaviour of model socketed pier foundations. The testing program included seven model piers constructed with different materials and different load-support conditions. The primary models were two small-diameter concrete piers constructed in soft shale. For all models tested the results indicated similarly shaped time-displacement curves, having two distinct regions. The initial portion of the curves represents a region of primary creep and the remaining portion represents a zone of secondary creep having a much lower rate of displacement. A comparison of short-term (1 day, which is a normal maximum duration of a full-scale load test) and long-term (200 days) settlements for the model piers showed an 84-245% increase in settlements. In addition, some information concerning load transfer with time in the model piers and available data from loading tests on large-scale socketed piers are included.Key words: socketed pier foundations, long-term settlement, creep model tests, soft rock.I1 y a peu d'information disponible concernant le comportement du tassement a long terme des fondations de pieux fores encastris dans le rocher. Cet article resume les resultats d'ktudes sur modMe en laboratoire du comportement du tassement a long terme (fluage) de fondations de pieux encastres. Le programme d'essais comprenait sept pieux modkles construits avec differents materiaux et avec differentes conditions de support de charge. Les modkles primaires Ctaient constitues de deux pieux de petits diamktres en beton construits dans le schiste mou. Pour tous les modkles testes, les resultats ont donne des courbes temps-deplacement de mCme forme ayant deux zones distinctes. La portion initiale des courbes represente une zone de fluage primaire et le reste represente une zone de fluage secondaire ayant une vitesse de diplacement beaucoup plus faible. Une comparaison des tassements des pieux modkle a court terme (1 jour, durie maximale normale d'un essai de chargement grande Cchelle) et a long terme (200 jours) a montre une augmentation de 84 a 245% dans les tassements. De plus, cet article contient des informations sur le transfert de charge dans les pieux modkles en fonction du temps, et les donnees disponibles des essais de chargement sur des pieux encastres a grande Cchelle.Mots cl6s : fondations de pieux encastres, tassement a long terme, essais de fluage sur modkle, roche molle.[Traduit par la revue]Can. Geotech. J. 26, 348-358 (1989)

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“…[13][14][15] This condition was the determining factor for the rock socket length -the expected settlements under the full loads were then around 10 mm and about 5 mm under the launching condition. Elastic shortening of the piles would add about 3 mm to these figures.…”

Section: Single Pilesmentioning

confidence: 99%

Design and construction of Clackmannanshire Bridge, Scotland

Bourne¹,

Minto²,

Platt³

et al. 2009

Proceedings of the Institution of Civil Engineers - Bridge Engi

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The Clackmannanshire bridge at Kincardine, Scotland is not only one of the largest bridges in the UK, but is also the second longest incrementally launched bridge in the world. The 1188 m long bridge provides relief to Kincardine on a route that crosses the Firth of Forth immediately upstream of the existing Kincardine Bridge. The environmental sensitivities of the Forth estuary have shaped almost every aspect of the scheme, including route selection, structural form, construction methods and programme.

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Elastic solutions for the design and analysis of rock-socketed piles

Cited by 85 publications

References 6 publications

Pile behaviour—theory and application

Pile behaviour—theory and application

Long-term settlement of model rock-socketed piers

Design and construction of Clackmannanshire Bridge, Scotland

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