Decementation, softening, and collapse: Changes in small-strain shear stiffness in K0 loading

Tae Sup Yun, J. Carlos Santamarina

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

The small-strain stiffness of freshly remolded soils is controlled by the state of stress. Diagenesis and cementation can significantly stiffen soils. However, these effects are lost at relatively low strain levels. Previous experimental results have shown the detrimental and irrecoverable effects of unloading on cementation. This study explores the effect of k0 loading on the small-strain stiffness of cemented specimens, with emphasis on the load-induced collapse and softening of cemented, loose soils. The evolution of collapse and decementation is monitored within an oedometric cell by means of small-strain shear wave propagation. Results highlight the interplay between stress-cementation history and initial void ratio. It is observed that the probability of collapse and decementation softening decreases with the increase in effective confinement at the time of cementation, the extent of cementation, and soil density. Volume collapse is preceded by stiffness loss. At high confinement, the stress-independent small-strain stiffness of initially cemented soils gradually converge to the stress-dependent stiffness that characterizes freshly remolded, uncemented soils.

Original languageEnglish
Pages (from-to)350-358
Number of pages9
JournalJournal of Geotechnical and Geoenvironmental Engineering
Volume131
Issue number3
DOIs
Publication statusPublished - 2005 Mar 1

Fingerprint

Shear strain
shear strain
softening
stiffness
cementation
Stiffness
Soils
soil
Shear waves
void ratio
unloading
Unloading
Wave propagation
wave propagation
diagenesis
S-wave
Loads (forces)
History
history
effect

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Environmental Science(all)

Cite this

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abstract = "The small-strain stiffness of freshly remolded soils is controlled by the state of stress. Diagenesis and cementation can significantly stiffen soils. However, these effects are lost at relatively low strain levels. Previous experimental results have shown the detrimental and irrecoverable effects of unloading on cementation. This study explores the effect of k0 loading on the small-strain stiffness of cemented specimens, with emphasis on the load-induced collapse and softening of cemented, loose soils. The evolution of collapse and decementation is monitored within an oedometric cell by means of small-strain shear wave propagation. Results highlight the interplay between stress-cementation history and initial void ratio. It is observed that the probability of collapse and decementation softening decreases with the increase in effective confinement at the time of cementation, the extent of cementation, and soil density. Volume collapse is preceded by stiffness loss. At high confinement, the stress-independent small-strain stiffness of initially cemented soils gradually converge to the stress-dependent stiffness that characterizes freshly remolded, uncemented soils.",
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Decementation, softening, and collapse : Changes in small-strain shear stiffness in K0 loading. / Yun, Tae Sup; Santamarina, J. Carlos.

In: Journal of Geotechnical and Geoenvironmental Engineering, Vol. 131, No. 3, 01.03.2005, p. 350-358.

Research output: Contribution to journalArticle

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AU - Santamarina, J. Carlos

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