Three Dimensional Numerical Study on Behavior of Geosynthetic Encased Stone Column Placed in Soft Soil

Dar, Lateef Ahmad; Shah, Mohammad Yousuf

doi:10.1007/s10706-020-01594-x

Cited by 22 publications

(6 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…From the result obtained through the FEM analysis, it shows that the load-carrying capacity of the stone column decreases as the spacing between stone columns increases, this phenomenon continues up to the s/d ratio of 3, beyond which the change becomes negligible. Tese fndings are consistent and in agreement with that of [40,46]. According to Table 4, which compares the improvement percentage of the DL-GESC to the SL-GESC, there is a considerable improvement when we move from s/ d � 2 to s/d � 3, while the change from s/d � 3 to s/d � 4 is marginal.…”

Section: Resultssupporting

confidence: 80%

Numerical Analysis of a Dual-Layer Geosynthetic-Encased Stone Column Installed in Soft Soil

Kumar

Nirola

et al. 2023

Advances in Civil Engineering

View full text Add to dashboard Cite

Stone columns are being used to reduce soft soil settlement and increase load-carrying capacity. Since there is inadequate lateral support from the local native soil, soft soil undergoes excessive settlement under vertical loading. This issue is effectively resolved by suitably encasing stone column material by geosynthetic with significant axial stiffness, which provides the required additional confinement reported in the literature. In the current study, an effort has been made to examine the load settlement behaviour of the dual-layered geosynthetic-encased stone column (DL-GESC) under vertical loading. In order to simulate the behaviour of stone column-reinforced soft soil, a FEM analysis was performed using PLAXIS-3D and three-dimensional (3D) models made utilising the unit cell idealisation technique for a single column. The stone column diameter, spacing to diameter (s/d) ratio, and encasement layers were varied to determine their influence on load-settling behaviour. The vertical load-carrying capacity of the ground was significantly improved when an additional layer of geosynthetic encasement was inserted into the stone column as compared to SL-GESC. Improvement of 15–25% was observed for the analysis of a single column installed in soft clay, according to the result obtained. Improvement ratios have been discussed in detail for various encasement conditions.

show abstract

Section: Resultssupporting

confidence: 80%

Numerical Analysis of a Dual-Layer Geosynthetic-Encased Stone Column Installed in Soft Soil

Kumar

Nirola

et al. 2023

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…Birim hücre kavramında sınır koşulları etkisinin ihmal edilmesi, yükün sadece düşey yönlü tatbiki, kolonlar arası etkileşim ve grup etkisinin ihmal edilmesi gibi çeşitli kabuller yapılmaktadır. Bu kabullere rağmen birim hücrenin karmaşık problemlere basit çözümler getirmesi ve sonuçların makul olması yöntemin yaygınlaşmasına katkı sağlamaktadır [15]. Şekil 3.…”

Section: Birim Hücre Kavramıunclassified

Taş Kolon Tasarım Parametrelerinin Konsolidasyona Etkisinin Araştırılması

Uysal

Yildiz

2022

NÖHÜ Müh. Bilim. Derg.

View full text Add to dashboard Cite

Taş kolon, yumuşak zeminin taşıma kapasitesini artırmak, yumuşak zemin konsolidasyonunu hızlandırmak ve zemin oturmasını azaltmak için kullanılan etkili bir zemin iyileştirme yöntemidir. Bu çalışmada, literatürde geçmiş bir laboratuvar çalışmasından alınan doğrulanmış bir sayısal model ve model parametreleri kullanılarak taş kolonun zamana bağlı davranışını değerlendirmek için bir dizi sayısal çalışma yapılmıştır. Taş kolon ile iyileştirilmiş yumuşak zemin birim hücre yaklaşımı kullanılarak PLAXIS 2D ile modellenmiştir. Gerilme konsantrasyon oranı, permeabilite oranı ve çap oranının taş kolonun zamana bağlı oturma davranışı üzerindeki etkisini anlamak için parametrik çalışmalar yapılmıştır. Sayısal sonuçlar, bu tasarım parametrelerinin konsolidasyonun hızlanması ve ortalama konsolidasyon hızının artması üzerinde önemli bir etkiye sahip olduğunu göstermektedir.

show abstract

“…Lateef and M. Shah (2020) [10] make studies where they investigated the impact of different internal friction angles of the stone column on the load settlement behaviour. In their investigation when they changed the angle of internal friction of the materials of the encased stone column for GESC of 0.5 m diameter with a value between 30°-50°, the enhancement is mild in the bearing capacity of GESCs which could be observed by increasing the angle of internal friction of the stone column.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Encased Stone Columns in Soft Clay

Mohamed

2022

Journal of Engineering Research

View full text Add to dashboard Cite

Ground improvement techniques are commonly used in different construction sites where the existing soil conditions are very weak and can lead to unsatisfactory performance. Encased stone columns technique is employed to enhance the bearing capacity, shear strength, and stiffness of soil to reduce settlement, and accelerate the consolidation rate of soft soil. In this research, a series of (62) cases have been studied to investigate the behaviour of a single encased stone column in soft clay to figure out the encasement effect and its properties compared to that without encasement using a finite element model (FEM). PLAXIS 3D software package was used in this study stone columns with two diameters (D=0.4m and 0.6m) and the length of the stone column to the diameter (L/D) ratio is kept equal (10) in all cases. Two cases of stone columns were studied: without encasement which is an ordinary stone column (OSC) and with encasement as encased stone column (ESC) column which is surrounded by geotextile with different stiffness. At an internal friction angle of the stone column =45°, the increase in the BCR of the encased stone column over the case of untreated soil was found to be 227% and 200% for the two cases of column diameters (D=0.4m and 0.6m) respectively.

show abstract

Three Dimensional Numerical Study on Behavior of Geosynthetic Encased Stone Column Placed in Soft Soil

Cited by 22 publications

References 28 publications

Numerical Analysis of a Dual-Layer Geosynthetic-Encased Stone Column Installed in Soft Soil

Numerical Analysis of a Dual-Layer Geosynthetic-Encased Stone Column Installed in Soft Soil

Taş Kolon Tasarım Parametrelerinin Konsolidasyona Etkisinin Araştırılması

Behaviour of Encased Stone Columns in Soft Clay

Contact Info

Product

Resources

About