Stress-strain responses of reconstituted and natural compressible Chicago glacial clay

Young Hoon Jung, Richard J. Finno, Wanjei Cho*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Reconstituted clay specimens with same stress history are often used to characterize natural samples due to their minimal variability and the reduced impact of sampling disturbance. The use of reconstituted samples is very effective particularly at sites with uniform geologic formation. This paper compares the results and analysis of a laboratory investigation of the very small, small and large strain behaviors of reconstituted and natural Chicago clay. Reconstituted specimens were cut from blocks derived from the slurry consolidation of dried natural Chicago glacial clays. Index properties and results of axially-oriented bender element tests and drained stress probe tests and oedometer tests were compared with data for natural specimens. Even though both sample types share similar index properties, 1D consolidation characteristics and failure lines, softer responses of reconstituted samples are observed in terms of initial shear moduli, shear, bulk and coupled responses and local yielding surface. The differences in those quantities of the two sample types are neither uniform nor proportional with strain levels. The developed structures due to the longer ageing period of natural samples are clearly shown in terms of residual effective stress ratios, shear wave velocity and deformation parameters including coupling between shear and volumetric responses. Thus, the small strain response of natural compressible Chicago glacial clay cannot be simply quantified via reconstituting process presented herein.

Original languageEnglish (US)
Pages (from-to)9-19
Number of pages11
JournalEngineering Geology
Volume129-130
DOIs
StatePublished - Mar 19 2012

Keywords

  • Chicago clay
  • Reconstituted samples
  • Small strain
  • Stiffness

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

Fingerprint Dive into the research topics of 'Stress-strain responses of reconstituted and natural compressible Chicago glacial clay'. Together they form a unique fingerprint.

Cite this