Earth Pressure at rest of Søvind Marl – a highly overconsolidated Eocene clay

Gitte Lyng Grønbech, Lars Bo Ibsen, Benjaminn Nordahl Nielsen

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1 Citation (Scopus)
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Abstract

The present study evaluated earth pressure at rest, K0, in highly overconsolidated Eocene clay called Søvind Marl, which exhibits extremely high plasticity indices of up to 300%, a highly fissured structure, and preconsolidation stresses up to 6,800 kPa. Continuous Loading Oedometer (CLO) tests with a constant rate of strain were conducted on Søvind Marl in the Danish Continuous Loading Oedometer Apparatus, which enables test water to be applied at 200 kPa, and measures the horizontal stresses via pressure gauges placed in a stiff oedometer ring. The horizontal and vertical stresses were measured from in situ stresses to various stress levels to estimate continuous K0 development in this highly overconsolidated clay. The normally consolidated earth pressure at rest was found for two different sample ages of Søvind Marl to be between 0.42 and 0.68. Results indicated the overconsolidated K0 reached values as high as 6 to 8 in the in situ stress range. Meyerhof’s (1976) reported correlation between K0(oc) and OCR was found inconsistent with K0(oc) development of in Søvind Marl. However, the development of OCRlab dependent on previous test stresses, as an alternative to preconsolidation stresses, showed congruent results using α = 1.05 independent of sample age.
Original languageEnglish
JournalEngineering Geology
Volume200
Issue numberJanuary
Pages (from-to)66-74
Number of pages9
ISSN0013-7952
DOIs
Publication statusPublished - 2016

Fingerprint

earth pressure
marl
Clay
Eocene
Earth (planet)
clay
in situ stress
oedometer test
plasticity
gauge
Pressure gages
Optical character recognition
Plasticity
water
test

Keywords

  • Earth pressure at rest
  • Overconsolidated clay
  • Constant rate of strain
  • Plastic clay

Cite this

Grønbech, Gitte Lyng ; Ibsen, Lars Bo ; Nielsen, Benjaminn Nordahl. / Earth Pressure at rest of Søvind Marl – a highly overconsolidated Eocene clay. In: Engineering Geology. 2016 ; Vol. 200, No. January. pp. 66-74.
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abstract = "The present study evaluated earth pressure at rest, K0, in highly overconsolidated Eocene clay called S{\o}vind Marl, which exhibits extremely high plasticity indices of up to 300{\%}, a highly fissured structure, and preconsolidation stresses up to 6,800 kPa. Continuous Loading Oedometer (CLO) tests with a constant rate of strain were conducted on S{\o}vind Marl in the Danish Continuous Loading Oedometer Apparatus, which enables test water to be applied at 200 kPa, and measures the horizontal stresses via pressure gauges placed in a stiff oedometer ring. The horizontal and vertical stresses were measured from in situ stresses to various stress levels to estimate continuous K0 development in this highly overconsolidated clay. The normally consolidated earth pressure at rest was found for two different sample ages of S{\o}vind Marl to be between 0.42 and 0.68. Results indicated the overconsolidated K0 reached values as high as 6 to 8 in the in situ stress range. Meyerhof’s (1976) reported correlation between K0(oc) and OCR was found inconsistent with K0(oc) development of in S{\o}vind Marl. However, the development of OCRlab dependent on previous test stresses, as an alternative to preconsolidation stresses, showed congruent results using α = 1.05 independent of sample age.",
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Earth Pressure at rest of Søvind Marl – a highly overconsolidated Eocene clay. / Grønbech, Gitte Lyng; Ibsen, Lars Bo; Nielsen, Benjaminn Nordahl.

In: Engineering Geology, Vol. 200, No. January, 2016, p. 66-74.

Research output: Contribution to journalJournal articleResearchpeer-review

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N2 - The present study evaluated earth pressure at rest, K0, in highly overconsolidated Eocene clay called Søvind Marl, which exhibits extremely high plasticity indices of up to 300%, a highly fissured structure, and preconsolidation stresses up to 6,800 kPa. Continuous Loading Oedometer (CLO) tests with a constant rate of strain were conducted on Søvind Marl in the Danish Continuous Loading Oedometer Apparatus, which enables test water to be applied at 200 kPa, and measures the horizontal stresses via pressure gauges placed in a stiff oedometer ring. The horizontal and vertical stresses were measured from in situ stresses to various stress levels to estimate continuous K0 development in this highly overconsolidated clay. The normally consolidated earth pressure at rest was found for two different sample ages of Søvind Marl to be between 0.42 and 0.68. Results indicated the overconsolidated K0 reached values as high as 6 to 8 in the in situ stress range. Meyerhof’s (1976) reported correlation between K0(oc) and OCR was found inconsistent with K0(oc) development of in Søvind Marl. However, the development of OCRlab dependent on previous test stresses, as an alternative to preconsolidation stresses, showed congruent results using α = 1.05 independent of sample age.

AB - The present study evaluated earth pressure at rest, K0, in highly overconsolidated Eocene clay called Søvind Marl, which exhibits extremely high plasticity indices of up to 300%, a highly fissured structure, and preconsolidation stresses up to 6,800 kPa. Continuous Loading Oedometer (CLO) tests with a constant rate of strain were conducted on Søvind Marl in the Danish Continuous Loading Oedometer Apparatus, which enables test water to be applied at 200 kPa, and measures the horizontal stresses via pressure gauges placed in a stiff oedometer ring. The horizontal and vertical stresses were measured from in situ stresses to various stress levels to estimate continuous K0 development in this highly overconsolidated clay. The normally consolidated earth pressure at rest was found for two different sample ages of Søvind Marl to be between 0.42 and 0.68. Results indicated the overconsolidated K0 reached values as high as 6 to 8 in the in situ stress range. Meyerhof’s (1976) reported correlation between K0(oc) and OCR was found inconsistent with K0(oc) development of in Søvind Marl. However, the development of OCRlab dependent on previous test stresses, as an alternative to preconsolidation stresses, showed congruent results using α = 1.05 independent of sample age.

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