Preconsolidation of Søvind Marl - a highly fissured Eocene clay

Gitte Lyng Grønbech, Lars Bo Ibsen, Benjaminn Nordahl Nielsen

Research output: Contribution to journalJournal articleResearchpeer-review

2 Citations (Scopus)

Abstract

Determination of the preconsolidation stresses is a key tool in geotechnical engineering used to evaluate and estimate the behavior of soils. However, it has been proven difficult to accurately estimate the preconsolidation in highly fissured overconsolidated clays, due to the effect of the fissured structure of the clay. This article presents oedometer tests performed on Søvind Marl, a plastic Eocene clay, with a high presence of fissures and slickensides. Four incremental loading oedometer tests and four continuous loading oedometer tests were performed in order to determine the preconsolidation stresses. Used test apparatus and methods are presented. The differences between the testing methods and results are discussed. Several well-established methods were used to determine the preconsolidation stresses based on the oedometer tests. All tests and interpretation methods yields the same result; two apparent values can be determined as the preconsolidation stresses. However, only the upper boundary is deemed to be related to the preconsolidation, and the lower boundary arises as the fissured structure collapses during increasing stresses. The upper boundaries of the preconsolidation stresses of Søvind Marl are found in the range of 6,300 to 8,900 kPa, whereas the lower boundaries are found to be in the range of 600 to 800 kPa
Original languageEnglish
JournalGeotechnical Testing Journal
Volume38
Issue number4
Pages (from-to)501-510
Number of pages10
ISSN0149-6115
DOIs
Publication statusPublished - 2015

Fingerprint

marl
oedometer test
Clay
Eocene
clay
collapse structure
slickenside
Geotechnical engineering
testing method
geotechnical engineering
fissure
plastic
Plastics
Soils
Testing
soil

Keywords

  • Consolidation
  • Stiffness
  • Clays
  • Fabric/structure of soils
  • Laboratory equipment
  • Laboratory tests

Cite this

Grønbech, Gitte Lyng ; Ibsen, Lars Bo ; Nielsen, Benjaminn Nordahl. / Preconsolidation of Søvind Marl - a highly fissured Eocene clay. In: Geotechnical Testing Journal. 2015 ; Vol. 38, No. 4. pp. 501-510.
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abstract = "Determination of the preconsolidation stresses is a key tool in geotechnical engineering used to evaluate and estimate the behavior of soils. However, it has been proven difficult to accurately estimate the preconsolidation in highly fissured overconsolidated clays, due to the effect of the fissured structure of the clay. This article presents oedometer tests performed on S{\o}vind Marl, a plastic Eocene clay, with a high presence of fissures and slickensides. Four incremental loading oedometer tests and four continuous loading oedometer tests were performed in order to determine the preconsolidation stresses. Used test apparatus and methods are presented. The differences between the testing methods and results are discussed. Several well-established methods were used to determine the preconsolidation stresses based on the oedometer tests. All tests and interpretation methods yields the same result; two apparent values can be determined as the preconsolidation stresses. However, only the upper boundary is deemed to be related to the preconsolidation, and the lower boundary arises as the fissured structure collapses during increasing stresses. The upper boundaries of the preconsolidation stresses of S{\o}vind Marl are found in the range of 6,300 to 8,900 kPa, whereas the lower boundaries are found to be in the range of 600 to 800 kPa",
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Preconsolidation of Søvind Marl - a highly fissured Eocene clay. / Grønbech, Gitte Lyng; Ibsen, Lars Bo; Nielsen, Benjaminn Nordahl.

In: Geotechnical Testing Journal, Vol. 38, No. 4, 2015, p. 501-510.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Preconsolidation of Søvind Marl - a highly fissured Eocene clay

AU - Grønbech, Gitte Lyng

AU - Ibsen, Lars Bo

AU - Nielsen, Benjaminn Nordahl

PY - 2015

Y1 - 2015

N2 - Determination of the preconsolidation stresses is a key tool in geotechnical engineering used to evaluate and estimate the behavior of soils. However, it has been proven difficult to accurately estimate the preconsolidation in highly fissured overconsolidated clays, due to the effect of the fissured structure of the clay. This article presents oedometer tests performed on Søvind Marl, a plastic Eocene clay, with a high presence of fissures and slickensides. Four incremental loading oedometer tests and four continuous loading oedometer tests were performed in order to determine the preconsolidation stresses. Used test apparatus and methods are presented. The differences between the testing methods and results are discussed. Several well-established methods were used to determine the preconsolidation stresses based on the oedometer tests. All tests and interpretation methods yields the same result; two apparent values can be determined as the preconsolidation stresses. However, only the upper boundary is deemed to be related to the preconsolidation, and the lower boundary arises as the fissured structure collapses during increasing stresses. The upper boundaries of the preconsolidation stresses of Søvind Marl are found in the range of 6,300 to 8,900 kPa, whereas the lower boundaries are found to be in the range of 600 to 800 kPa

AB - Determination of the preconsolidation stresses is a key tool in geotechnical engineering used to evaluate and estimate the behavior of soils. However, it has been proven difficult to accurately estimate the preconsolidation in highly fissured overconsolidated clays, due to the effect of the fissured structure of the clay. This article presents oedometer tests performed on Søvind Marl, a plastic Eocene clay, with a high presence of fissures and slickensides. Four incremental loading oedometer tests and four continuous loading oedometer tests were performed in order to determine the preconsolidation stresses. Used test apparatus and methods are presented. The differences between the testing methods and results are discussed. Several well-established methods were used to determine the preconsolidation stresses based on the oedometer tests. All tests and interpretation methods yields the same result; two apparent values can be determined as the preconsolidation stresses. However, only the upper boundary is deemed to be related to the preconsolidation, and the lower boundary arises as the fissured structure collapses during increasing stresses. The upper boundaries of the preconsolidation stresses of Søvind Marl are found in the range of 6,300 to 8,900 kPa, whereas the lower boundaries are found to be in the range of 600 to 800 kPa

KW - Consolidation

KW - Stiffness

KW - Clays

KW - Fabric/structure of soils

KW - Laboratory equipment

KW - Laboratory tests

KW - Consolidation

KW - Stiffness

KW - Clays

KW - Fabric/structure of soils

KW - Laboratory equipment

KW - Laboratory tests

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JO - Geotechnical Testing Journal

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SN - 0149-6115

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