Consolidation by Prefabricated Vertical Drains with a Threshold Gradient

Guo, Xiao; Xie, Kongliang; Deng, Yue-Bao

doi:10.1155/2014/410390

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…Terefore, the analysis of clay consolidation should allow for a time-stepping procedure that takes into account timebased incremental loading [59]. In a specifc context, the main intention of introducing drains to clay soil is to accomplish the consolidation process within predefned time duration, to attain a required minimum excess pore pressure, or to attain the required degree of consolidation [60,61]. In relation to this, the analysis conducted in the current study targeted at completing the consolidation process within a certain time duration, which can possibly be achieved via the introduction of a staged construction approach.…”

Section: Te Consolidation Process and Staged Constructionmentioning

confidence: 99%

Consolidation Attributes and Deformation Response of Soft Clay Reinforced with Vertical Scoria Drains under Road Embankment

Gebretsadik

Melese

Negesa

2023

Advances in Materials Science and Engineering

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Application of vertical drains in soft clay soils is a common practice widely known to facilitate the consolidation rate. To overcome the adverse impact of a long-lasting consolidation process, highly permeable materials such as sand and crushed aggregates are used as drains. However, limited information exists regarding the applicability of scoria gravel as a vertical drain that no concisely documented information is observed in the literature. This study hence aimed at investigating suitability of scoria as a vertical drain in perpetuating the consolidation process of soft clay under highway embankment. Finite element-based numerical simulation was used to model the drain. The model was carried out by using 3D version of Plaxis software. In order to incorporate the effect of gradual load increment on the consolidation rate, the staged construction approach was employed. Both the square and triangular installation patterns were considered in the model in order to explore the critical effects of the drain installation pattern on the rate of consolidation. The numerical analysis also included varying dimensions of the vertical drain so as to investigate the effects of the dimension parameters of the vertically installed scoria drains. The conducted numerical analysis revealed that the rate of consolidation was considerably accelerated with provision of a group of scoria drains. With increase in the diameter of the drain, the consolidation rate increases, whereas the consolidation rate is inversely related to increase in drain spacing. For the drain installed at a spacing of 2 m, a diameter of 0.4 m, and a length of 8 m any arbitrary settlement magnitude is achieved 25 days earlier than the case without drains. Besides, incorporation of scoria drains lessens the pore pressure developed. The comparative analysis conducted on the effect of drain arrangement revealed that no considerable difference was witnessed in the performance of the square and triangular installation patterns even though the consolidation rate remains slightly faster in the case of the triangular installation pattern.

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Section: Te Consolidation Process and Staged Constructionmentioning

confidence: 99%

Consolidation Attributes and Deformation Response of Soft Clay Reinforced with Vertical Scoria Drains under Road Embankment

Gebretsadik

Melese

Negesa

2023

Advances in Materials Science and Engineering

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“…Bu eşleme yöntemlerinde dren aralığı ve/veya dren etrafındaki zeminin permeabilitesinde değişiklikler yapılmaktadır. Düşey drenlerin sayısal analizinde taş kolonlar için de kullanılan birim hücre yaklaşımı kullanılmaktadır [22]; [23]. Bu çalışma kapsamında taş kolon ve düşey drenlerin sayısal analizleri için eksenel simetrik birim hücre yaklaşımı kullanılmıştır.…”

Section: Taş Kolon Ve Düşey Drenlerin Sayısal Analizleriunclassified

Zemi̇n İyi̇leşti̇rme Yöntemleri̇ni̇n Zemi̇n Konsoli̇dasyonuna Etki̇si̇: Vaka Anali̇zi̇

Oral

Uysal

2020

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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Bu çalışmada esas olarak taş kolon ve düşey dren yöntemlerinin konsolidasyon oturmalarının azaltılması ve konsolidasyonun hızlandırılması açısından performansları değerlendirilmiştir. Çalışmanın ilk aşamasında taş kolonlar ve düşey drenlerinin kullanımı ve bu yöntemler için geliştirilmiş sayısal analiz yöntemleri araştırılmıştır. Çalışmanın sonraki aşamasında, düşey drenlerin tasarımı için önem arz eden bazı tasarım parametrelerinin etkisi Plaxis yazılımı kullanılarak sayısal olarak araştırılmıştır. Son olarak, Changi Doğu Islah Projesi analiz edilmiştir. Analizler iki pilot araştırma için yapılmış olup, analizlerde taş kolon ve düşey drenlerin konsolidasyon davranışı modellenmiştir. Sayısal analiz sonuçları, arazi ölçümlerine bakılarak değerlendirilmiş ve bu iki iyileştirme yönteminin konsolidasyon davranışı karşılaştırılmıştır. Karşılaştırma analizleri sonucunda, taş kolonların özellikle konsolidasyon oturmalarının azaltılması ve konsolidasyonun hızlandırılması açısından daha fazla avantaj sağladığı tespit edilmiştir.

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“…Substituting equations (19) and (20) into equation 18, the governing equation for one-dimensional large-strain consolidation of overconsolidated clays with a threshold gradient in the Lagrangian coordinate can be derived as follows:…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

“…Under this condition, an approximation to the e ective ow velocity described by non-Darcian ow [10,13] can be provided by the model of water ow in clay with a threshold gradient. In this way, there has been some progress in consolidation theories of clays with a threshold gradient [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Large-Strain Nonlinear Consolidation of Overconsolidated Clays with a Threshold Hydraulic Gradient

Xiao

Yang

et al. 2018

Advances in Civil Engineering

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The existence of the threshold hydraulic gradient in clays under a low hydraulic gradient has been recognized by many studies. Meanwhile, most nature clays to some extent exist in an overconsolidated state more or less. However, the consolidation theory of overconsolidated clays with the threshold hydraulic gradient has been rarely reported in the literature. In this paper, a one-dimensional large-strain consolidation model of overconsolidated clays with consideration of the threshold hydraulic gradient is developed, and the finite differential method is adopted to obtain solutions for this model. The influence of the threshold hydraulic gradient and the preconsolidation pressure of overconsolidated clay on consolidation behavior is investigated. The consolidation rate under large-strain supposition is faster than that under small-strain supposition, and the difference in the consolidation rate between different geometric suppositions increases with an increase in the threshold hydraulic gradient and a decrease in the preconsolidation pressure. If Darcy’s law is valid, the final settlement of overconsolidated clays under large-strain supposition is the same as that under small-strain supposition. For the existence of the threshold hydraulic gradient, the final settlement of the clay layer with large-strain supposition is greater than that with small-strain supposition.

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Consolidation by Prefabricated Vertical Drains with a Threshold Gradient

Cited by 9 publications

References 19 publications

Consolidation Attributes and Deformation Response of Soft Clay Reinforced with Vertical Scoria Drains under Road Embankment

Consolidation Attributes and Deformation Response of Soft Clay Reinforced with Vertical Scoria Drains under Road Embankment

Zemi̇n İyi̇leşti̇rme Yöntemleri̇ni̇n Zemi̇n Konsoli̇dasyonuna Etki̇si̇: Vaka Anali̇zi̇

One-Dimensional Large-Strain Nonlinear Consolidation of Overconsolidated Clays with a Threshold Hydraulic Gradient

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