Encased Stone Columns for Soft Ground Improvement

Dutta, Sushovan; Nadaf, Maheboobsab B.; Birali, Ram Rathan Lal; Mandal, J. N.

doi:10.1061/9780784480144.074

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Geosynthetic encasement could also improve the lateral load capacity of the granular column by developing hoop tension forces in the encasement layer, giving additional confinement to the column material (Mohapatra et al, 2016). As a result, they minimise the chances for bulging failure and for penetration of column material into the surrounding soil that could inhibit the drainage ability of the column (Dutta et al, 2016). As this study is among the first to investigate the performance of a granular column based on its type of column backfilling material (NS, MS or CWG), it was logical not to encase the granular column during the tests, providing benchmark results excluding the effect of the encasement.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

confidence: 99%

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

et al. 2022

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“…The encasement works well in an embankment of soft clayey soil; there is also a reduction in hoop tension [25][26][27]. By reinforcing the entire column, it improves the magnitude of loadcarrying capacity of the column [28]; where the optimum length for encasement is four times the diameter of the column [29]. While considering the stress factor, it is observed that the resultant stress on the column top reduces by 65% when the diameter increases [30].…”

Section: Introductionmentioning

confidence: 97%

Comparison of Encased Stone Column with Conventional Column for Varied Parameters through Experimental and Numerical Investigations

S. V.,

James,

Pavithra

et al. 2023

Advances in Civil Engineering

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Installation of stone columns is a widely used stabilization method in improving the characteristics of soft clays. In this study, laboratory tests were conducted to understand the influence of column number, spacing and encasement on the load-carrying capacity of the modified soil. Unit cell concept is adopted for column diameters of 25.4 and 31.75 mm, one and two numbers of columns and spacings of 50, 70, and 90 mm under the conditions of with and without encasement. In addition to the laboratory study, finite element analysis was also done for similar parameters to understand the modified soil’s settlement characteristics and stress concentration ratio. Based on the analysis, it is understood that the load-carrying capacity increases with number of columns and spacing. Considering the influence of encasement, larger diameter columns showed a more significant increase in the load-carrying capacity when compared to the smaller diameter columns.

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Enhancement in Effectiveness of Cemented Stone Columns for Soft Clay Ground Improvement by Providing Underreamed Bulbs

Golait¹,

Padade

2018

Int. J. Geomech.

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Encased Stone Columns for Soft Ground Improvement

Cited by 3 publications

References 11 publications

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

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

Comparison of Encased Stone Column with Conventional Column for Varied Parameters through Experimental and Numerical Investigations

Enhancement in Effectiveness of Cemented Stone Columns for Soft Clay Ground Improvement by Providing Underreamed Bulbs

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