Torque correlation for solid steel square shaft helical piles

Joe Heinisch, Tayler Cook

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Deep Foundations

ABSTRACT: Several analytical methods can be used to estimate the ultimate capacity of a helical pile. These methods involve calculations and the need for detailed information about the in situ soils. Alternatively, the most reliable method involves an empirical relationship between installation torque and ultimate capacity, and only requires soil types and blow counts (SPT N-values) to estimate installation depths. The results of several axial compression load tests in various soil types are examined to demonstrate that this empirical relationship can be conservative when estimating helical pile capacity in compression, and load testing can result in more efficient designs.

RÉSUMÉ: Les plusieurs méthodes analytiques peuvent être utilisé pour estimé la capacité des pieux d™acier vrillé. Ces méthodes nécessitent des calculs et de l™information détaillée du sol qui va supporter la charge. Pourtant, les plus exactes méthodes est resté celui impliquant une relation empirique entre l'installation toque et capacité ultimate, n'exigeant aucune information sur les sols plus que les types de sols et les valeurs SPT d'estimer profondeur. Les résults de plusieurs essais de charges compression axial dans divers types de sols sont examinés à montrer que cette relation empirique peut être conservateur dans l'estimation la capacité des pieux d™acier vrillé, et le charger les essais peuvent entraîner un dessin et modèles plus efficaces.

Access this article:
Canadian Geotechnical Society members can access to this article, along with all other Canadian Geotechnical Conference proceedings, in the Member Area. Conference proceedings are also available in many libraries.

Cite this article:
Joe Heinisch; Tayler Cook (2011) Torque correlation for solid steel square shaft helical piles in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper966,author = Joe Heinisch; Tayler Cook ,title = Torque correlation for solid steel square shaft helical piles,year = 2011}