Experimental study on soil improvement with stone columns and granular blankets

Mehrannia, Nima; Kalantary, Farzin; Ganjian, Navid

doi:10.1007/s11771-018-3790-z

Cited by 16 publications

(6 citation statements)

References 45 publications

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“…columns increases the bearing capacity of the stone column as much as 40%. This is in agreement with findings of Debnath and Dey, [8,17] who reported that stone-column encasement increases the efficiency of stone columns significantly. It worth mentioning that although small scale models have been used in this research, the same behavior has been observed from test results on the full-scale stone columns as reported by Yoo and Lee [22].…”

Section: Numerical Analysissupporting

confidence: 93%

Experimental and numerical study on the bearing capacity of encased stone columns

2020

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Stone columns have attracted considerable attention as a ground improvement techniques recently. Performance of stone columns, however, depends on confining pressure offered by the surrounding soils. In the case of very soft soils, the lateral confining pressure may be insufficient and this may lead to column bulging failure. Encapsulating the individual stone column enhances the lateral resistance against bulging by additional confining pressure. In this study, the influences of the length of encasement and type of aggregate materials on the bearing capacity of a single stone column in both dry sand and clay bed were investigated. The results indicated a clear improvement by encasing the half-length of the column. The numerical study also showed the effect of reinforcement stiffness reduces with increase in the cohesion of the clay. Parametric study showed that the effect of encasement stiffness is insignificant for clay bed with high values of cohesion.

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Section: Numerical Analysissupporting

confidence: 93%

Experimental and numerical study on the bearing capacity of encased stone columns

2020

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“…Vibro-replacement is generally used for clayey soils (Priebe, 1995). Moreover, granular columns are environment-friendly (Hanna et al, 2013;Mehrannia et al, 2018). They release relatively lower greenhouse gas emissions and consume relatively less fuel during their installation (Chawla et al, 2010).…”

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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“…experimental (Ghazavi and Nazariafshar, 2013;Murtaza and Samadhiya, 2016) and numerical (Han and Gabr, 2002;Hanna et al, 2013;Chakraborty and Kumar, 2014). The ultimate bearing capacity of soft soil rises significantly due to GB and reducing the bulging of the stone column because of geotextile and geogrids as reinforcement in stone column and granular blankets, respectively (Mehrannia et al, 2018;Nazariafshar et al, 2019). The use of OSC enhances the tension and bearing capacity of the soft soil, (Niroumand et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on load-settlement response of reinforced granular blanket over ordinary stone column

Gupta

Sathe²,

Sharma

2022

Int. J. Appl. Sci. Eng.

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Stone columns are a more economical and efficient method to enhance the strength of expansive soils. Using a granular blanket over the top of the ordinary stone columns (OSC) improves the drainage and distribution of the applied stress impending from the superstructure. The present study studied the effect of geogrid layers in a granular blanket (GB) over the top of the OSC numerically using 'PLAXIS 2D'. 'Mohr-Coulomb failure criterion was deliberated for the stone column, granular blanket, expansive soil, and elastoplastic behavior is considered for geogrid layers as reinforcement. Present review results are validated with the experimental results and agree greatly. Numerical results show that the construction of a GB with a geogrid layer over the stone column increases stress transformation to the depth of OSC. Thus 'stress concentration' is decreased in the higher zone of the OSC. Likewise, assessing the impact of geogrid layers in a granular blanket on the 'bearing capacity and settlement of OSC, it was observed that it reduces the lateral bulging, settlement and increases the ground's bearing capacity.

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Experimental study on soil improvement with stone columns and granular blankets

Cited by 16 publications

References 45 publications

Experimental and numerical study on the bearing capacity of encased stone columns

Experimental and numerical study on the bearing capacity of encased stone columns

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

Numerical analysis on load-settlement response of reinforced granular blanket over ordinary stone column

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