An estimation method for predicting final consolidation settlement of ground improved by floating cement columns

Ryohei Ishikura (Lead / Corresponding author), Noriyuki Yasufuku, Michael Brown

Research output: Contribution to journalArticle

6 Citations (Scopus)
7 Downloads (Pure)

Abstract

Ground improvement using floating soil cement columns with shallow stabilization is an effective technique for the treatment of deep soft soil layers under infrastructure embankments. In order to investigate the settlement performance of this improvement technique, model load testing of model column analogues for visualization of ground behavior under plane strain conditions was performed and field observations at full scale test embankments were investigated.

The results of model testing and field investigation show that the ground below an embankment founded on a floating column system can be considered as two separate layers with a confined portion and a consolidating layer which can be related to the degree of improvement used at a particular site such as the improvement ratio and the depth of improvement.

A simplified estimation method for final consolidation settlement is proposed using a stress distribution ratio which considers the contribution from skin friction at the surface of floating columns. The advantage of this method is that is possible to determine the consolidating layer thickness as a function of simple parameters such as the degree of improvement, loading conditions and undrained soil strength. The predicted settlements of the improved ground correspond well to that measured in full scale case studies.
Original languageEnglish
Pages (from-to)213-227
Number of pages15
JournalSoils and Foundations
Volume56
Issue number2
Early online date24 Mar 2016
DOIs
Publication statusPublished - Apr 2016

Fingerprint

Embankments
estimation method
Consolidation
consolidation
Cements
cement
embankment
Soil cement
Load testing
Soils
Skin friction
ground improvement
Stress concentration
soil strength
plane strain
soft soil
Visualization
Stabilization
visualization
skin

Keywords

  • Ground improvement
  • Soft soils
  • Floating soil cement column
  • Shallow stabilization Consolidation (IGC: E02, K06)

Cite this

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title = "An estimation method for predicting final consolidation settlement of ground improved by floating cement columns",
abstract = "Ground improvement using floating soil cement columns with shallow stabilization is an effective technique for the treatment of deep soft soil layers under infrastructure embankments. In order to investigate the settlement performance of this improvement technique, model load testing of model column analogues for visualization of ground behavior under plane strain conditions was performed and field observations at full scale test embankments were investigated.The results of model testing and field investigation show that the ground below an embankment founded on a floating column system can be considered as two separate layers with a confined portion and a consolidating layer which can be related to the degree of improvement used at a particular site such as the improvement ratio and the depth of improvement.A simplified estimation method for final consolidation settlement is proposed using a stress distribution ratio which considers the contribution from skin friction at the surface of floating columns. The advantage of this method is that is possible to determine the consolidating layer thickness as a function of simple parameters such as the degree of improvement, loading conditions and undrained soil strength. The predicted settlements of the improved ground correspond well to that measured in full scale case studies.",
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An estimation method for predicting final consolidation settlement of ground improved by floating cement columns. / Ishikura, Ryohei (Lead / Corresponding author); Yasufuku, Noriyuki; Brown, Michael.

In: Soils and Foundations, Vol. 56, No. 2, 04.2016, p. 213-227.

Research output: Contribution to journalArticle

TY - JOUR

T1 - An estimation method for predicting final consolidation settlement of ground improved by floating cement columns

AU - Ishikura, Ryohei

AU - Yasufuku, Noriyuki

AU - Brown, Michael

PY - 2016/4

Y1 - 2016/4

N2 - Ground improvement using floating soil cement columns with shallow stabilization is an effective technique for the treatment of deep soft soil layers under infrastructure embankments. In order to investigate the settlement performance of this improvement technique, model load testing of model column analogues for visualization of ground behavior under plane strain conditions was performed and field observations at full scale test embankments were investigated.The results of model testing and field investigation show that the ground below an embankment founded on a floating column system can be considered as two separate layers with a confined portion and a consolidating layer which can be related to the degree of improvement used at a particular site such as the improvement ratio and the depth of improvement.A simplified estimation method for final consolidation settlement is proposed using a stress distribution ratio which considers the contribution from skin friction at the surface of floating columns. The advantage of this method is that is possible to determine the consolidating layer thickness as a function of simple parameters such as the degree of improvement, loading conditions and undrained soil strength. The predicted settlements of the improved ground correspond well to that measured in full scale case studies.

AB - Ground improvement using floating soil cement columns with shallow stabilization is an effective technique for the treatment of deep soft soil layers under infrastructure embankments. In order to investigate the settlement performance of this improvement technique, model load testing of model column analogues for visualization of ground behavior under plane strain conditions was performed and field observations at full scale test embankments were investigated.The results of model testing and field investigation show that the ground below an embankment founded on a floating column system can be considered as two separate layers with a confined portion and a consolidating layer which can be related to the degree of improvement used at a particular site such as the improvement ratio and the depth of improvement.A simplified estimation method for final consolidation settlement is proposed using a stress distribution ratio which considers the contribution from skin friction at the surface of floating columns. The advantage of this method is that is possible to determine the consolidating layer thickness as a function of simple parameters such as the degree of improvement, loading conditions and undrained soil strength. The predicted settlements of the improved ground correspond well to that measured in full scale case studies.

KW - Ground improvement

KW - Soft soils

KW - Floating soil cement column

KW - Shallow stabilization Consolidation (IGC: E02, K06)

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JF - Soils and Foundations

SN - 0038-0806

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