CONSTRUCTION EFFECT ON LOAD TRANSFER ALONG BORED PILES

Load transfer behavior along bored piles is affected by details of pile construction, especially those imposing stress and moisture changes to the surrounding soils. An investigation involving moisture migration tests, in situ horizontal stress measurements, and borehole shear and pressuremeter tests shows clear effects of construction that lead to subsequent changes in soil properties. The construction of bored piles in Singapore and the region often involves casting of concrete either in unsupported "dry" boreholes or "wet" boreholes filled with water. It is necessary to differentiate these 2 extreme construction conditions in bored pile design. Based on triaxial compression and pressuremeter tests on residual soil of the Jurong Formation in Singapore, the variation of soil modulus with shear strain can be described by a hyperbolic function. A procedure is recommended for assessing the combined effect of stress relief and soaking on soil modulus by introducing a modulus reduction factor. Modulus degradation curves from pressuremeter tests with the borehole conditions properly simulated are found capable of producing load transfer curves comparable to those deduced in the field.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3519342
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Chang, M-F
  • Zhu, H
• Publication Date: 2004-4

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 426-437
• Serial:
  • Journal of Geotechnical and Geoenvironmental Engineering
  • Volume: 130
  • Issue Number: 4
  • Publisher: American Society of Civil Engineers
  • ISSN: 1090-0241
  • Serial URL: http://ojps.aip.org/gto

Subject/Index Terms

• TRT Terms: Boreholes; Foundation engineering; Geotechnical engineering; Load transfer; Pile foundations; Residual soils; Soil mechanics; Structural supports; Support piles
• Geographic Terms: Singapore
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00972341
• Record Type: Publication
• Files: TRIS, ATRI
• Created Date: Apr 14 2004 12:00AM