Experimental study, numerical modeling of and axial prediction approach to base grouted drilled shafts in cohesionless soils

Sudheesh Thiyyakkandi, Michael McVay, David Bloomquist, Peter Lai

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The pressure grouting of drilled shaft tips has become popular worldwide due to its effectiveness in mobilizing a larger portion of the available tip resistance under service displacements. This paper presents experimental and numerical studies on the load transfer mechanism and factors controlling the axial response of base grouted drilled shafts in cohesionless soils. The study found that the increased axial capacity of grout-tipped drilled shafts under service loads and displacements depended mainly on preloading effects and the increased tip area provided by the grouting process. A simple prediction approach for estimating the tip capacity of grouted shafts utilizing cone penetration resistance was suggested based on the results of the study. The validity of the proposed approach was verified by the analysis of full-scale case studies of grouted shafts reported in the literature.

Original languageEnglish
Pages (from-to)439-454
Number of pages16
JournalActa Geotechnica
Volume9
Issue number3
DOIs
Publication statusPublished - Jun 2014

Keywords

  • Cone penetration resistance
  • Drilled shaft
  • Grouting
  • Load test
  • Load transfer
  • Numerical analysis
  • Tip resistance

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

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