Stress Transfer Mechanism in 2D and 3D Unit Cell Models for Stone Column Improved Ground

Ng, Kok Shien; Tan, Siong Kiat

doi:10.1007/s40891-014-0003-1

Cited by 20 publications

(12 citation statements)

References 14 publications

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“…At the same tank load value, the 3D modelling implied settlement and internal forces of raft foundation on the unsaturated soil smaller than those of the 2D modelling as an evidence of the higher bearing capacity determined by 3D modelling. The later results match well with the studies of [51,53]. The settlement and the internal forces were calculated approach the failure of the saturated soil for both the 2D and 3D simulations.…”

Section: Discussionsupporting

confidence: 87%

Geotechnical Behaviour of Sandy Sabkha Soils Based on Experimental and Numerical Investigations

Elsawy

Lakhouit

2021

Indian Geotech J

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The main objective of the present study is to investigate and evaluate the geo-environmental characteristics of continental Sabkha soil. This type of soil is widespread throughout the world, especially in Saudi Arabia. For the current work, disturbed and undisturbed samples are extracted from a site in Tymaa, Saudi Arabia. The natural geotechnical properties are determined, and chemical analyses are performed. Modified compaction, California bearing ratio (CBR), direct shear, and potential collapse tests are conducted experimentally on the soil, with the obtained results indicating that Sabkha soil is poorly graded sand and contains high concentrations of salts, causing a corrosive environment. Therefore, reinforced concrete foundations of structures built on this type of soil should be protected. In the tests, the compacted samples induce high values of shear strength and CBR. However, the soaked Sabkha soils show very low values of shear strength parameters and CBR compared to those of non-soaked samples. Hence, Sabkha soil indicates collapsible behaviour when soaked in water, which is attributable to the weak salt bonds between the soil grains. Also carried out in this work are numerical simulations of a fuel tank resting on unsaturated and saturated Sabkha soil, utilizing 2D and 3D Plaxis programs. The numerical analyses results show that while unsaturated soil has good performance under tank loads, it collapses under the loads when soaked in water. These outcomes match experimental results. In the limit state, the raft foundation on saturated soil shows greater values of settlement and internal forces compared to those of the raft foundation prior to immersion. Hence, Sabkha soil requires treatment before being built on.

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Section: Discussionsupporting

confidence: 87%

Geotechnical Behaviour of Sandy Sabkha Soils Based on Experimental and Numerical Investigations

Elsawy

Lakhouit

2021

Indian Geotech J

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“…This model is mostly used to compute realistic bearing capacity and collapse loads of footing as well as other application in which the failure behaviour of soil plays dominant role. Ng and Tan [42] stated that stone column in the unit cell shared about 4-5 times more loads than the surrounding soils throughout the column depth. They concluded that PLAXIS 2D and 3D models give results that are similar to each other especially on the settlement performance and the failure mechanism.…”

Section: Finite Element Analysismentioning

confidence: 99%

“…Therefore shape of unit cell does not affect the vertical load intensity-settlement relationship. In Plaxis 3D model, intrinsic mechanism such as the continuous shearing plane that occurred in the granular pile cannot be reproduced correctly by the axisymmetrical model [42]. Due to geometry limitation in PLAXIS, the cylindrical unit cell of equivalent diameter was simulated as square unit cell model in the present study.…”

Section: Finite Element Analysismentioning

confidence: 99%

Experimental and Numerical Analysis of Geosynthetic-Reinforced Floating Granular Piles in Soft Clays

Hasan

Samadhiya

2016

Int. J. of Geosynth. and Ground Eng.

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The installation of reinforced granular piles is a commonly adopted technique to improve load carrying capacity and reduce settlements in very soft clayey soils. This paper presents results of a series of laboratory model tests and numerical analysis carried on geosynthetic reinforced granular pile under short term loading. Unit cell concept has been adopted. Laboratory model tests were conducted on unreinforced, vertical encased, reinforced with horizontal strips and combined vertical-horizontal reinforced granular piles. The loading was applied either over the entire cylindrical tank area or only over the area of granular piles. The effects of various parameters such as reinforcement, encasement stiffness, shear strength of clay, length and diameter of granular piles have been studied. Experimental results in the form of vertical load intensitysettlement relationship have been compared with that obtained from PLAXIS 3D. The results of laboratory model tests indicated significant influence of reinforcement on the ultimate load intensity of granular piles and ultimate bearing capacity of treated ground. Lateral bulging in reinforced granular piles has also been controlled by incorporating geosynthetic materials.

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“…Theoretically, the unit cell model is mostly used to analyse granular columns (Castro, 2017). It consists of a single column and its corresponding tributary area transformed into an equivalent circle (influence zone) with the same cross-sectional area (Ng & Tan, 2015). The diameter of a unit cell is equal to de = 1.05 -1.13s for triangular and square grids, respectively, where s is the centre-to-centre spacing between columns (Castro, 2017).…”

Section: Introductionmentioning

confidence: 99%

Kaolin Clay Reinforced with a Granular Column Containing Crushed Waste Glass or Traditional Construction Sands

et al. 2022

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Installation of granular columns is a cost-effective and versatile in situ technique to improve the shear strength, settlement, and drainage behaviour of weak soils. It involves backfilling vertical boreholes in the ground with granular materials stiffer than the native soil, such as stone or compacted sand.However, the massive use and overexploitation of sand and natural aggregates have depleted their reserves in recent decades, causing damage to the environment, creating sand shortages and skyrocketing their price. Hence, it is essential to develop a sustainable alternative to natural aggregates to construct granular columns. The ever-increasing stockpiles of waste glass could be a potential replacement for natural sand in several geotechnical construction applications, noting that both materials have a similar chemical composition. Using crushed waste glass (CWG) as an alternative to traditional natural and manufactured (quarried) sands in granular columns could offer a multipronged benefit by recycling non-biodegradable waste (glass) and by conserving a depleting natural resource (sand). Using a large direct shear (LDS) machine, this study investigated the shear strength behaviour of kaolin (to represent a typical weak soil) reinforced with a central granular column. Three different materials were separately used to backfill the column, including natural sand (NS), manufactured sand (MS) and CWG. The results revealed that the geocomposites containing the CWG column have the highest peak friction angle and relatively greater shear strength under high normal stresses, favouring the potential use of CWG as a green alternative to traditional sands in backfilling granular columns, ultimately supporting resource conservation, waste recycling and the paradigm shift towards a circular economy.

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Stress Transfer Mechanism in 2D and 3D Unit Cell Models for Stone Column Improved Ground

Cited by 20 publications

References 14 publications

Geotechnical Behaviour of Sandy Sabkha Soils Based on Experimental and Numerical Investigations

Geotechnical Behaviour of Sandy Sabkha Soils Based on Experimental and Numerical Investigations

Experimental and Numerical Analysis of Geosynthetic-Reinforced Floating Granular Piles in Soft Clays

Kaolin Clay Reinforced with a Granular Column Containing Crushed Waste Glass or Traditional Construction Sands

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