IN-SITU LOADING TESTS OF SMALL-DIAMETER HELICAL PILES AND EVALUATION OF DESIGN METHODS

Weidong Li, Lijun Deng, Richard Schmidt, Baocheng Li

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Foundations IV / Fondations IV

ABSTRACT: The present research investigated the behaviour of three types of single-helix piles. The research conducted axial loading tests of helical piles installed in cohesive and cohesionless soils located in Alberta. Subsurface conditions of testing sites were investigated using cone penetration tests (CPT). Correlations between the axial capacity and final installation torque were proposed based on the testing results. It was observed that, for the two smaller piles, the torque factor varied with the amplitude of axial capacities while the biggest piles had relatively stabilized torque factor values. In addition, CPT-based method and several indirect methods were used to predict the pile capacities. It is shown that the CPT-based method provides adequate agreement with the test results despite that modified end bearing coefficients for helical piles were adopted for capacity prediction. It is therefore recommended that CPT-based method could be used directly to predict the pile axial capacity.

RÉSUMÉ: axial ont été menés sur des pieux à vis installés dans des sols cohérents et pulvérulents situés en Alberta. des essais, le sous-sol est examiné par des essais au pénétromètre statique (CPT, Cone Penetration Test). A partir des résultats expérimentaux, il est proposé des corrélations entre la capacité de charge axiale et le couple mesuré en fin allation. Il est observé que pour les deux pieux les plus petits, le facteur de couple varie selon la capacité axiale du pieu, tandis que pour les pieux les plus gros, les valeurs du facteur de couple sont relativement constantes. Aussi, une méthode basée coefficients pour la résistance de pointe peut donc être directement utilisée pour estimer la capacité axiale du pieu.

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:
Weidong Li; Lijun Deng; Richard Schmidt; Baocheng Li (2015) IN-SITU LOADING TESTS OF SMALL-DIAMETER HELICAL PILES AND EVALUATION OF DESIGN METHODS in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.

@article{510,author = Weidong Li; Lijun Deng; Richard Schmidt; Baocheng Li,title = IN-SITU LOADING TESTS OF SMALL-DIAMETER HELICAL PILES AND EVALUATION OF DESIGN METHODS ,year = 2015}