Determination of the deformation properties of Søvind Marl

Gitte Grønbech, Benjaminn Nordahl Nielsen, Lars Bo Ibsen

Research output: Book/ReportReportResearch

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Abstract

A serie of tests were made to determine the preconsolidation stresses, σ′pc, and the consolidation modulus, K, of Søvind Marl, a fissured plastic tertiary clay. The fissures causes a decrease in the stiffness of the Søvind Marl, which can be mistaken for the decrease that happens when the effective stresses in the soil, σ′, passes σ′pc. The effects of the fissures are assessed, and an estimate of the stress level at which they will compress are made. During
the consolidation tests, the effective stress level is raised to more then 24,000 kPa to get a comprehensive description of the preconsolidation of the soil.

It is important to know how a strongly preconsolidated soil will deform when reloaded. The deformation parameters of the strongly preconlidated Søvind Marl is determined by unloading/reloading testing. It is found that the stiffness of the Søvind Marl depends of the plasticity index, and one conclusive expression of the consolidation modulus of the Søvind Marl can therefor not be given.

Original languageEnglish
Place of PublicationAalborg
PublisherDepartment of Civil Engineering, Aalborg University
Number of pages18
Publication statusPublished - 2010
SeriesDCE Technical reports
Number89

Fingerprint

marl
consolidation
effective stress
fissure
stiffness
soil
unloading
plasticity
plastic
clay
test

Keywords

  • Fissured clay
  • Søvind Marl
  • Preconsolidation Stress
  • Consolidation modulus
  • Plasticity index

Cite this

Grønbech, G., Nielsen, B. N., & Ibsen, L. B. (2010). Determination of the deformation properties of Søvind Marl. Aalborg: Department of Civil Engineering, Aalborg University. DCE Technical reports, No. 89
Grønbech, Gitte ; Nielsen, Benjaminn Nordahl ; Ibsen, Lars Bo. / Determination of the deformation properties of Søvind Marl. Aalborg : Department of Civil Engineering, Aalborg University, 2010. 18 p. (DCE Technical reports; No. 89).
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Grønbech, G, Nielsen, BN & Ibsen, LB 2010, Determination of the deformation properties of Søvind Marl. DCE Technical reports, no. 89, Department of Civil Engineering, Aalborg University, Aalborg.

Determination of the deformation properties of Søvind Marl. / Grønbech, Gitte; Nielsen, Benjaminn Nordahl; Ibsen, Lars Bo.

Aalborg : Department of Civil Engineering, Aalborg University, 2010. 18 p. (DCE Technical reports; No. 89).

Research output: Book/ReportReportResearch

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AU - Ibsen, Lars Bo

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N2 - A serie of tests were made to determine the preconsolidation stresses, σ′pc, and the consolidation modulus, K, of Søvind Marl, a fissured plastic tertiary clay. The fissures causes a decrease in the stiffness of the Søvind Marl, which can be mistaken for the decrease that happens when the effective stresses in the soil, σ′, passes σ′pc. The effects of the fissures are assessed, and an estimate of the stress level at which they will compress are made. During the consolidation tests, the effective stress level is raised to more then 24,000 kPa to get a comprehensive description of the preconsolidation of the soil. It is important to know how a strongly preconsolidated soil will deform when reloaded. The deformation parameters of the strongly preconlidated Søvind Marl is determined by unloading/reloading testing. It is found that the stiffness of the Søvind Marl depends of the plasticity index, and one conclusive expression of the consolidation modulus of the Søvind Marl can therefor not be given.

AB - A serie of tests were made to determine the preconsolidation stresses, σ′pc, and the consolidation modulus, K, of Søvind Marl, a fissured plastic tertiary clay. The fissures causes a decrease in the stiffness of the Søvind Marl, which can be mistaken for the decrease that happens when the effective stresses in the soil, σ′, passes σ′pc. The effects of the fissures are assessed, and an estimate of the stress level at which they will compress are made. During the consolidation tests, the effective stress level is raised to more then 24,000 kPa to get a comprehensive description of the preconsolidation of the soil. It is important to know how a strongly preconsolidated soil will deform when reloaded. The deformation parameters of the strongly preconlidated Søvind Marl is determined by unloading/reloading testing. It is found that the stiffness of the Søvind Marl depends of the plasticity index, and one conclusive expression of the consolidation modulus of the Søvind Marl can therefor not be given.

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Grønbech G, Nielsen BN, Ibsen LB. Determination of the deformation properties of Søvind Marl. Aalborg: Department of Civil Engineering, Aalborg University, 2010. 18 p. (DCE Technical reports; No. 89).