Smear Effects of Vertical Drains on Soft Bangkok Clay

Bergado, Dennes T.; Asakami, Hiroshi; Alfaro, Marolo C.; Balasubramaniam, A. S.

doi:10.1061/(asce)0733-9410(1991)117:10(1509)

Cited by 161 publications

(64 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, in the case of thick soil deposits with low permeability, the consolidation time is very long, and hence a system of vertical drains is often introduced to achieve accelerated radial drainage and consolidation. The performance of various types of vertical drain, including sand compaction piles, sand drains and geosynthetic (prefabricated) vertical drains (PVDs), has been investigated by a number of researchers (Bergado et al, 1991;Indraratna and Redana, 2000;Holtz et al, 2001;Indraratna and Bamunawita, 2002). It is found that, among the different techniques, the use of geosynthetic vertical drains is a very cost-effective method.…”

Section: Improvement Of Rail Track Performance Using Geosyntheticsmentioning

confidence: 99%

Geotechnical properties of ballast and the role of geosynthetics in rail track stabilisation

Indraratna

Khabbaz²,

Salim

et al. 2006

Proceedings of the Institution of Civil Engineers - Ground Impr

141

View full text Add to dashboard Cite

The ballast and its engineering behaviour have a key role in governing the stability and performance of railway tracks. The deformation and degradation behaviour of ballast under static and dynamic loads was studied based on large-scale triaxial testing. The possible use of different types of geosynthetics to improve the performance of fresh and recycled ballast was also investigated. The research findings showed that the inclusion of geosynthetics improves the performance of ballasted tracks.Keywords : geosynthetics; large-scale triaxial testing; railway ballast Le ballast et son comportement mécanique ont une influence importante sur la stabilité et la performance des voies ferrées. Nous avons étudié le comportement de détériora-tion et de déformation du ballast sous charge statiques et dynamiques en nous basant sur des essais triaxiaux à grande échelle. Nous avons également étudié la possibilité d'utiliser divers types de géosynthétiques pour améliorer la performance du ballast neuf et recyclé. Les résultats de cette recherche ont montré que l'adjonction de géosynthé-tiques améliorait la performance des voies ballastées.

show abstract

Section: Improvement Of Rail Track Performance Using Geosyntheticsmentioning

confidence: 99%

Geotechnical properties of ballast and the role of geosynthetics in rail track stabilisation

Indraratna

Khabbaz²,

Salim

et al. 2006

Proceedings of the Institution of Civil Engineers - Ground Impr

141

View full text Add to dashboard Cite

show abstract

“…Therefore, establishing accurate smear zone characterisation under laboratory conditions is difficult, and the implications of these installation procedures compared to actual field installation are often not well documented. Using monitored settlement data of an embankment, where vertical drains were installed using two different sizes of mandrels, Bergado et al (1991) observed a higher settlement and faster rate of consolidation in the area where the smaller mandrel was used. Rujikiatkamjorn et al (2013) proposed a conceptual model that captured the effects of soil structure by performing undisturbed large-scale testing, and suggested a three-zone model around the vertical drain, but a characterisation of the smear zone in relation to actual field conditions was not included in their study.…”

Section: Introductionmentioning

confidence: 99%

Soil disturbance analysis due to vertical drain installation

Indraratna

Perera

Rujikiatkamjorn

et al. 2015

Proceedings of the Institution of Civil Engineers - Geotechnica

View full text Add to dashboard Cite

The installation of drains creates a disturbed region known as a smear zone where the change in the clay structure affects the horizontal permeability and compressibility. The parameters required to characterise the smear effect are the extent of the smear zone and the ratio of the horizontal coefficient of permeability in the undisturbed zone and in the smear zone. Only limited studies have been carried out on different aspects of soil disturbance due to driving vertical drains and its effects on the subsequent consolidation. In this paper the disturbed zone around a rectangular mandrel was characterised using soil samples obtained from the soft clay layer at various locations beneath an embankment built at Ballina, Australia, where vertical drains were installed. By determining the change in the coefficient of permeability, the water content and volume compressibility across the smear zone, the effects of soil disturbance on consolidation due to the installation of drains can be quantified using the available numerical model. Disciplines Engineering | Science and Technology StudiesThe installation of drains creates a disturbed region known as a smear zone where the change in the clay structure affects the horizontal permeability and compressibility. The parameters required to characterise the smear effect are the extent of the smear zone and the ratio of the horizontal coefficient of permeability in the undisturbed zone and in the smear zone. Only limited studies have been carried out on different aspects of soil disturbance due to driving vertical drains and its effects on the subsequent consolidation. In this paper the disturbed zone around a rectangular mandrel was characterised using soil samples obtained from the soft clay layer at various locations beneath an embankment built at Ballina, Australia, where vertical drains were installed. By determining the change in the coefficient of permeability, the water content and volume compressibility across the smear zone, the effects of soil disturbance on consolidation due to the installation of drains can be quantified using the available numerical model.

show abstract

“…According to Hansbo (1987) and Bergado et al (1991), the k h /k v ratio was found to be close to unity in the smear zone. This agrees with the study by Indraratna and Redana (1998).…”

Section: Smear Zonementioning

confidence: 95%

“…Based on laboratory study and backanalysis, Bergado et al (1991) proposed that the following relation could be assumed: Indraratna and Redana (1998) proposed that the estimated smear zone could be as large as (4-5)d w . This proposed relationship was verified using a specially designed large-scale consolidometer (Indraratna and Redana, 1995).…”

Section: Smear Zonementioning

confidence: 99%

Theoretical and Numerical Perspectives and Field Observations for the Design and Performance Evaluation of Embankments Constructed on Soft Marine Clay

Indraratna¹,

Sathananthan²,

Bamunawita³

et al. 2015

Ground Improvement Case Histories

View full text Add to dashboard Cite

In this chapter, a two-demensional plane strain solution is adopted for the embankment analysis, which includes the effects of smear zone caused by mandrel driven vertical drains. The equivalent (transformed) permeability coefficients are incorporated in finite element codes, employing modified Cam-clay theory. Selected numerical studies have been carried out to study the effect of embankment slope, construction rate, and drain spacing on the failure of the soft clay foundation. Finally, the observed and predicted performances of well-instrumented full-scale trial embankments built on soft Malaysian marine clay have been discussed in detail. The predicted results agree with the field measurements.

show abstract

Smear Effects of Vertical Drains on Soft Bangkok Clay

Cited by 161 publications

References 6 publications

Geotechnical properties of ballast and the role of geosynthetics in rail track stabilisation

Geotechnical properties of ballast and the role of geosynthetics in rail track stabilisation

Soil disturbance analysis due to vertical drain installation

Theoretical and Numerical Perspectives and Field Observations for the Design and Performance Evaluation of Embankments Constructed on Soft Marine Clay

Contact Info

Product

Resources

About