Lateral Capacity of Helical Piles Augmented With Collar Vane Technology

Details

• Creators:
  Gallant, Aaron ; Carvajal-Munoz, Juan Sebastian ; Ferdandez-Escobar, Camilo ; Berube, Keith ; Bradshaw, Aaron
• Corporate Creators:
  University of Maine. Transportation Infrastructure Durability Center (TIDC)
• Corporate Contributors:
  United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
• Subject/TRT Terms:
  • Support piles
  • Granular soils
  • Load tests
  • Hydraulic equipment
  • Torsional strength
  • Sand equivalent test
  • Lateral Capacity
  • Helical Piles
  • Collar Vane Technology
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Corporate Publisher:
  University of Maine. Transportation Infrastructure Durability Center (TIDC)
• Abstract:
  This report presents the results of a full-scale experimental investigation of helical pile (HP) foundations augmented with collar vane (CV) technology. The collar vane is a finned element installed near the pile head to mobilize soil resistance at shallow depths and reduce bending demands in slender helical pile shafts. Testing was conducted in cohesive soil and a constructed sand pit and included monotonic and cyclic lateral and torsional loading, as well as overturning tests representative of wind loading on roadside sign structures. Results show that collar vanes significantly increase lateral and torsional geotechnical resistance and reduce shaft bending moments relative to helical piles without vanes. Overturning tests demonstrate that selected HP–CV systems can perform comparably to conventional drilled shaft foundations used for sign support. Overall, the findings indicate that collar vane technology can expand the applicability of helical piles for transportation infrastructure, offering an efficient foundation alternative for infrastructure subjected to lateral loads.
• Format:
  PDF
• Funding:
  69A3551847101
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/88982/dot_88982_DS1.pdf
• File Type:
  [PDF - 7.70 MB]
• Collection(s):
  University Transportation Centers
• Main Document Checksum:
  urn:sha-512:312f23f5c010eae818a40d2881d4f3d96e09b3e10fced517aa1dc2bf5112efc127cc1de2f18c28c0de26141fb0bd5fc541faeadac387d6164f3cd789726fba7d