Load transfer characteristics of micropiles in dolomite

Richard J Finno*, Steven D. Scherer, Benoit Paineau, Jill Roboski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Axial load tests were conducted on four micropiles installed from the floor of a quarry southwest of Chicago. The micropiles consisted of 178 mm diameter steel drill casing with a wall thickness of 13 mm. The piles were drilled into dolomite with sockets that varied in length from 0.3 to 2 m, were tremie filled, and then grouted with pressures of about 140 kPa. The tests were conducted on piles instrumented with strain gages to determine axial load distributions and load transfer characteristics. The non-linearity of the response of the composite pile was considered when determining the axial load distribution in the piles. Results of the tests suggest the current practice based on structural considerations can be quite conservative, if the rock is competent. Load transfer through side friction is governed by the interface shear strength between the steel casing and the surrounding grout.

Original languageEnglish (US)
Pages (from-to)1038-1053
Number of pages16
JournalGeotechnical Special Publication
Issue number116 II
StatePublished - Mar 7 2002

ASJC Scopus subject areas

  • Building and Construction
  • Architecture
  • Soil Science

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