IN-SITU AXIAL LOAD TESTS OF DRILLED DISPLACEMENT STEEL PILES
Fazli Shah, Lijun Deng
In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost ConferenceSession: Foundations IV / Fondations IV
ABSTRACT: Drilled Displacement Steel Pile (DDSP) is an innovative pile type that fully displaces the soil during installation. DDSP consists of a conical tip with steel blades and a steel tubular pipe. Compared to conventional drilled displacement piles, this pile type has many advantages that include rapid installation, immediate usability, and greater pile capacities. Consequently, DDSP has recently been widely used in varieties of engineering applications in Western Canada. However, the axial behaviour of DDSP has not been well understood due to the lack of research, and a design guideline has not been developed. A series of in-situ load tests of full-scale piles were conducted at two testing sites in Alberta. Three axial compression and two tensile tests were conducted on heavily instrumented piles. The paper evaluates the axial capacities and the load-transfer mechanisms during axial loading tests and compares the existing design methods adopted for other pile types.
RÉSUMÉ: Le pieu foré en acier (Drilled Displacement Steel Pile, DDSP) est un type novateur de pieux qui déplace complètement le sol lors de son installation. Le DDSP est formé d’une pointe conique avec des lames et un tube en acier. Par rapport aux pieux forés conventionnels, ce type de pieu possède de nombreux avantages incluant une installation rapide, une exploitabilité immédiate et de plus grandes capacités. En conséquence, le DDSP a récemment été largement utilisé dans diverses applications de l’ingénierie dans l’ouest du Canada. Cependant, le comportement axial du DDSP n’a pas été bien compris vue le manque de recherche et vue qu’aucun guide de conception n’a été établi. Un ensemble d’essais de chargement en place a été réalisé à l’échelle réelle en deux sites en Alberta. Trois essais en compression et deux essais en tension ont été réalisés sur des pieux largement instrumentés. L’étude évalue les capacités axiales et le mécanisme de transfert de charge pendant des essais de chargement axial et compare les méthodes de conception existantes adoptées pour d’autres types de pieux.
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Shah, Fazli, Deng, Lijun (2015) IN-SITU AXIAL LOAD TESTS OF DRILLED DISPLACEMENT STEEL PILES in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.
@inproceedings{Shah_GEO2015_155,
author = {{Shah, Fazli}, {Deng, Lijun}}
title = {IN-SITU AXIAL LOAD TESTS OF DRILLED DISPLACEMENT STEEL PILES}
booktitle = {Proceedings of the 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference}
year = {2015}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }
title = {IN-SITU AXIAL LOAD TESTS OF DRILLED DISPLACEMENT STEEL PILES}
booktitle = {Proceedings of the 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference}
year = {2015}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }