Preloading with prefabricated vertical strip drains

Holtz, Robert D.

doi:10.1016/0266-1144(87)90061-6

Cited by 66 publications

(29 citation statements)

References 4 publications

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“…Prefabricated vertical drains (PVDs) have been used successfully in many soil improvement and land reclamation project in Asia and the rest of the world (Hansbo, 1979(Hansbo, , 2005Holtz, 1987;Holtz et al, 1991;Bergado et al, 1990Bergado et al, , 1993aBergado et al, , b, 1996Bergado et al, , 2002Indraratna and Redana, 2000;Li and Rowe, 2001;Bo, 2002Bo, , 2004Bo et al, 2003Bo et al, , 2005aArulrajah et al, 2004;Chu et al, 2004;Rowe and Li, 2005;Indraratna et al, 2005). However, the cases of using PVDs for the improvement of ultra-soft soil, that is soil with no or little shear strength, are still rare.…”

Section: Introductionmentioning

confidence: 96%

Improvement of ultra-soft soil using prefabricated vertical drains

Chu

Bo²,

Choa

2006

Geotextiles and Geomembranes

136

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Section: Introductionmentioning

confidence: 96%

Improvement of ultra-soft soil using prefabricated vertical drains

Chu

Bo²,

Choa

2006

Geotextiles and Geomembranes

136

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“…Prefabricated vertical drains (PVDs) have been successfully used in conjunction with preloading to improve the mechanical properties of soft soils since the early 1970s (Bergado et al, 1993a;Holtz, 1987;Holtz et al, 1991;Johnson, 1970;Lo and Mesri, 1994). The installation of PVDs facilitates the dissipation of excess pore pressure generated during preloading by reducing the drainage path within the ground.…”

Section: Introductionmentioning

confidence: 98%

Analysis of PVD-enhanced consolidation with soil disturbance

Basu

Prezzi

2010

Proceedings of the Institution of Civil Engineers - Ground Impr

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Soil disturbance caused by the installation of prefabricated vertical drains (PVDs) in soft soil deposits has a detrimental effect on the rate of consolidation. The current practice of accelerating consolidation using PVDs captures the effect of soil disturbance typically by reducing the in situ hydraulic conductivity in the disturbed zone, and by assuming that the hydraulic conductivity is spatially constant over the entire disturbed zone and that preloading is instantaneous. Through recent laboratory and field studies it has been shown that the hydraulic conductivity varies spatially in the disturbed zone surrounding a PVD. Based on the data available in the literature, four possible profiles were identified for the spatial variation of the hydraulic conductivity in the disturbed zone. Analytical solutions were developed for the rate of consolidation considering these hydraulic conductivity profiles for instantaneous and time-dependent preloading. This paper shows that the consolidation rate depends not only on the hydraulic conductivity profile in the disturbed zone but also on the preloading rate.

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“…Embankments may be economically built on soft soil simply by using reinforcement to improve their stability (Chai et al, 2002;Rowe et al, 1995) and vertical drains to accelerate the settlement (Almeida et al, , 2011Holtz, 1987;Indraratna et al, 1992). Magnani et al (2010) compared the behaviour of three test embankments with different arrangements of geosynthetic reinforcement and vertical drains.…”

Section: Introductionmentioning

confidence: 99%

Ground improvement of soft soil by geotextile-encased columns

Hosseinpour

Almeida

Riccio

2016

Proceedings of the Institution of Civil Engineers - Ground Impr

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2 3This paper compares the field response of two test embankments constructed on similar soft soil deposits. The un-strengthened foundation had vertical drains underneath the embankment and the strengthened foundation had geotextile-encased granular columns, both provided with basal geogrid reinforcement. The effectiveness of the encased granular columns was assessed by comparing the settlement below the embankments, the horizontal displacement of the soft foundation and the excess pore pressures in the middle of the soft clay layer. The results showed that the granular encased columns significantly reduced the maximum settlement occurring below the embankment as well as the maximum horizontal displacement in the clayey foundation. At the same settlement level, the load-carrying capacity of the strengthened foundation was found to increase by as much as around 2·5 times that of the un-strengthened one. It was also observed that the geotextile-encased granular columns caused a noticeable reduction in the maximum excess pore pressure following load application. Furthermore, the degree of consolidation achieved at the end of embankment construction was quite high when encased granular columns were used.

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Preloading with prefabricated vertical strip drains

Cited by 66 publications

References 4 publications

Improvement of ultra-soft soil using prefabricated vertical drains

Improvement of ultra-soft soil using prefabricated vertical drains

Analysis of PVD-enhanced consolidation with soil disturbance

Ground improvement of soft soil by geotextile-encased columns

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