The Characteristics of PVD Smear Zone

Tran-Nguyen, Hoang-Hung; Edil, Tuncer B.

doi:10.1061/41165(397)77

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…Liu and Carter (2000) [43] discussed how the behavior of soil structures of the original soils was different from that of the reconstituted soils. Tran-Nguyen and Edil (2011) [26] who used reconstituted samples revealed that the extent and permeability ratios measured in their laboratory results were at the lower limit reported in the literature. These may occur because the soils were very disturbed and had no structure, thus less susceptible to disturbance.…”

Section: Use Of Reconstituted Soil Samplesmentioning

confidence: 80%

“…In addition they indicated that the static rig used to drive PVD into the ground caused less interference if compared with the vibration rig. Likewise Tran-Nguyen and Edil (2011) [26] concluded that the size and the shape of mandrels were important factors affecting the value of s'.…”

Section: The Dimension Shape and Type Of Mandrelsmentioning

confidence: 98%

“…Note that h and d are the height and the diameter of the cylindrical soil tank, consecutively. In contrast, Tran-Nguyen and Edil (2011) [26] developed the box-shape tank which then further utilized by Sengul, et al (2016) [33]. Before placed in the soil tank, the sample is tested for the basic soil properties including moisture content w, liquid limit L L , plastic limit P L , void ratio e, spesific gravity G s , unit weight soil γ, compression index c c , and swelling index c s .…”

Section: Important Notes Of Laboratory Workmentioning

confidence: 99%

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A Review on the Characteristics of the Smear Zone: Field Data Back Calculation Compared with Laboratory Testing

Iskandar¹,

Tarigan²,

Roesyanto³

2018

The Open. Civil Eng. J.

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Background:The so-called smear zone is a disturbed zone developed in soil during prefabricated vertical drainage (PVD) installation using a mandrel. There are 2 main parameters typically used to characterize the smear zone. First, the extent ratio signifies the extent of the soil damage due to mandrel penetration; and second, the permeability ratio κ represents the degree of disturbance to the soil permeability within the smear zone. Objectives:This study reviews 2 methods employed by various researchers to obtain the values for the 2 aforementioned parameters, i.e. 1) field data back calculation and 2) laboratory testing. It is found that the s' values vary between 2.0 -5.0 and between 2.0 -6.3 based on field data back calculation and laboratory testing, consecutively. On the other hand, the κ values vary between 2.0 -13.8 and 1.03 -3.13 based on field data back calculation and laboratory testing, consecutively. Results and Conclusion:With regard to the previous studies, three causes of the variation are suggested in this study: 1) the laboratory testing's inability to model the complexity of field conditions, 2) the absence of standardized laboratory methods that can be used as references and 3) the level of disturbance in the field which is considerably greater than that in the laboratory and differs at each research location. In addition to the review, historical data of a trial embankment at the embankment of the multi-purpose container yard in Kuala Tanjung, North Sumatra, Indonesia, are exhibited to illustrate the estimation of the s' and κ values.

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Section: Use Of Reconstituted Soil Samplesmentioning

confidence: 80%

Section: The Dimension Shape and Type Of Mandrelsmentioning

confidence: 98%

Section: Important Notes Of Laboratory Workmentioning

confidence: 99%

See 1 more Smart Citation

A Review on the Characteristics of the Smear Zone: Field Data Back Calculation Compared with Laboratory Testing

Iskandar¹,

Tarigan²,

Roesyanto³

2018

The Open. Civil Eng. J.

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“…Furthermore, the study found that the PVD worked more effectively in the inner smear zone and transition zone than in the undisturbed zone with decreasing radial distance. The following general relationship was determined for the three types of PVD: s u.cal = β ln r d0 + s u0 (12) where β is the slope of the shear strength of soil, r d0 is the radial distance of the actual distance, and s u0 is the initial shear strength.…”

Section: Shear Strength Of the Soilmentioning

confidence: 99%

“…The size and shape of the mandrel are among the factors influencing the smear zone effect in the field [12]. Various studies have shown that choosing a mandrel with optimal size and shape can reduce soil disturbance during installation and improve drainage performance [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Improved Mandrel System for Prefabricated Vertical Drain Installation: A Macro to Micro Analysis

et al. 2023

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Increasing development of infrastructure in Indonesia has driven the need for effective ground improvement methods to accelerate the consolidation of soft soil, which is estimated to occupy around 10% of the country’s land area. A prefabricated vertical drain combined with vacuum preloading is among the most effective methods for this purpose. However, the prefabricated vertical drain creates a smear zone in the surrounding soil area during installation. This study examines the effectiveness of a newly developed mandrel system in reducing the smear zone during prefabricated vertical drain installation. Large-scale consolidation tests at a macro level and microstructure analysis using scanning electron microscopy at a micro level were employed to investigate the effect of soil water content and shear strength. The results show that the water content and shear strength of the soft soil gradually increased in the inner smear zone and transition zone, while both decreased in the radial distance. Furthermore, the soil structure underwent a transformation in which the particle area and pore area became a closed flake structure, and apparent agglomeration occurred. The test results indicate that the newly developed mandrel system can effectively reduce the smear zone. The macro to micro test results demonstrated that the mandrel system is successful in reducing the smear zone effect.

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State of the Art on the Extent of Smear Zone and Variation of Permeability During the Installation of Drain in Clayey Soil

Aparna

Robinson

Gandhi

2022

Lecture Notes in Civil Engineering

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The Characteristics of PVD Smear Zone

Cited by 9 publications

References 4 publications

A Review on the Characteristics of the Smear Zone: Field Data Back Calculation Compared with Laboratory Testing

A Review on the Characteristics of the Smear Zone: Field Data Back Calculation Compared with Laboratory Testing

Improved Mandrel System for Prefabricated Vertical Drain Installation: A Macro to Micro Analysis

State of the Art on the Extent of Smear Zone and Variation of Permeability During the Installation of Drain in Clayey Soil

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