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IN-SITU LOADING TESTS OF SMALL-DIAMETER HELICAL PILES AND EVALUATION OF DESIGN METHODS
Session: Foundations IV / Fondations IV
Weidong Li, University of Alberta (Canada)
Lijun Deng, University of Alberta (Canada)
Richard Schmidt, Almita Piling Inc. (Canada)
Baocheng Li, Almita Piling Inc. (Canada)
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.
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