Analysis of Driven Pile Capacity within Pre-Bored Soil : Research Project Capsule

Details

• Creators:
  Chen, Shengli
• Corporate Creators:
  Louisiana Transportation Research Center
• Contributors:
  Rupnow, Tyson D. ; Zhang, Zhongjie
• Corporate Contributors:
  Louisiana. Department of Transportation and Development ; Louisiana State University (Baton Rouge, La.)
• Subject/TRT Terms:
  • Boring
  • Friction
  • Numerical analysis
  • Pile driving
  • Piles (Supports)
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Research Project Capsule
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  Pre-boring is a method used to facilitate large displacement pile driving in hard/dense soils (see Figure 1). By pre-boring a pilot hole, the end bearing and side friction within the pre-bored zone are reduced, thus aiding pile driving installation. However, pre-boring complicates the prediction of pile drivability and long-term pile capacity within the pre-bored zone (specifically side friction). In general, there are two major unknowns associated with the pre-bored zone: reduction of end bearing and reduction of side friction. It is assumed that long-term end bearing within the pre-bored zone will not be an issue, as specifications prohibit pre-drilling to the tip elevation. However, it is expected that the strength of the soil and the diameter of the pilot hole relative to the pile diameter will have an impact on pile drivability and long-term capacity. Quantifying this impact will help geotechnical design engineers to better understand the pile/pre-bored soil interactions and improve the design and construction of pile foundations in hard/dense soils. The objective of this project is to develop a feasible protocol for determining reduction factors for side friction and long-term pile capacity within pre-bored soil.
• Format:
  PDF
• Funding:
  18-1GT
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/34804/dot_34804_DS1.pdf
• File Type:
  [PDF - 157.62 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:53b38694ac8c0c954736f96821024bc90413ddf69df414afb05bc339e4983de3afd6f49020ccad74ff3d4c73ba5ad8abacb59706d42dca4e42df9d3265cd7bc6