Laboratory Study on Single Stone Columns Reinforced with Steel Bars and Discs

Rezaei, Milad; Lajevardi, Seyed Hamid; Saba, Hamidreza; Ghalandarzadeh, Abbas; Zeighami, Ehsanollah

doi:10.1007/s40891-019-0154-1

Cited by 14 publications

(7 citation statements)

References 33 publications

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“…The results obtained in this analysis have been validated with those of [13]. The agreement has been closed, as depicted in Fig.…”

Section: Resultssupporting

confidence: 59%

“…However, the simulated soil model is only half due to the symmetry where the vertical axis passes through the centre of the stone column. Based on [13], the boundary effect will be negligible when the depth and width of the numerical model are four times larger than the footing diameter (4D). In this study, the model boundary was assigned larger than 4D in vertical and horizontal directions to prevent the results from being influenced by the geometry.…”

Section: IImentioning

confidence: 99%

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Numerical Simulation of Stiffened Granular Pile

Gupta¹

2022

IJRASET

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Granular piles are suitable for increasing soft clay's strength and consolidation properties. Stone columns offer a practical, affordable solution for enhancing the earth and are crucial for stabilizing the soil. In order to carry higher shear stresses and prevent settlement, stone columns behaved as stiff elements, which enhanced the deformability and strength characteristics of the soft type of soil. The usage of granular piles has been shown to improve slope stability, increase bearing capacity, decrease differential and total settlements, decrease sand liquefaction, and lengthen settlement times. The present study studied the effect of stiffening on the granular pile using PLAXIS 2D. Mohr-Coulomb failure criterion was considered for the stone column, expansive soil, and granular material used for stiffening. The present study results are validated with the experimental results and are in good agreement. Numerical results show that stiffening in granular piles increases the load settlement response and stress transformation to a depth of granular pile and reduces the bulging

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“…The results obtained in this analysis have been validated with those of [13]. The agreement has been closed, as depicted in Fig.…”

Section: Resultssupporting

confidence: 59%

Section: IImentioning

confidence: 99%

Numerical Simulation of Stiffened Granular Pile

Gupta¹

2022

IJRASET

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“…The numerical analysis results were validated with Rezaei et al (2019). It shows the good agreement as depicted in Fig.…”

Section: Resultsmentioning

confidence: 69%

“…4. Rezaei et al (2019) presented the experimental results of a single granular pile reinforced with vertical bars and horizontal disc and, concluded that the bearing capacity of reinforced granular pile increases in both the cases due to the higher stiffness of granular pile and additional lateral confinement. The dia.…”

Section: Resultsmentioning

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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“…Te cinder gravel was moisturized with 5% water content to keep it free from absorbing water from the surrounding clay soil during the construction. Te construction of a cinder gravel column was done by flling to a height of D c /2 (half of the diameter of the cinder column) and continuing until the hole was flled, exactly as described by Rezaei [62]. To reach a compacted height of 25 mm, cinder gravel was charged into the hole in layers with a calculated quantity of 70 gram.…”

Section: Construction Of Cinder Gravel Column (Cgc)mentioning

confidence: 99%

Evaluating the Effectiveness of Nonwoven Geotextile-Encased Cinder Gravel Column in Improving Load-Bearing and Deformation Characteristics of Soft Clay

Tefera

Melese

Bafena

et al. 2023

Advances in Materials Science and Engineering

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Application of vertically installed columnar materials made of natural gravels or crushed aggregate is one of the commonly implemented practices to improve the performance of soft clay grounds under footing load. Alternative materials like cinder gravel also plays a reinforcing role when blended with soft clay. However, information on the precise extent to which a vertically installed cinder gravel column is effective in improving the properties of a clay foundation and its potential response to the permanently applied footing load has not been well documented in the literature. Hence, the current study specifically aimed at evaluating the effectiveness of geotextile-encased cinder gravel column in improving deformation and bearing capacity of soft clay ground. The experimental model which considered installation of a single geotextile-encased cinder gravel column into soft clay was considered. A cylindrical steel container was used in designing the experimental test. The container was filled with clay soil and the cinder gravel column was vertically installed through a replacement method. Finding of the study revealed that ultimate load-bearing capacity of the soft clay foundation after being reinforced with conventional cinder gravel was 1.85 times that of the untreated soft clay soil. The load-carrying capacity of the clay soil decreased with increment in diameter of the column whereas it is directly related to the volume replacement ratio. With regard to directional improvement, the vertical reinforcement performs better than the horizontal geotextile strips in cinder gravel column from bearing capacity improvement view point. In lessening settlement, however, application of horizontal geotextile discs at spacing ranging between half- and full-column diameter overweighs performance of the vertical encasement. In summary, application of geotextile encasement to the top 75% of the clay thickness is sufficient to come up with optimum improvement in bearing capacity and encasing the entire thickness is not necessarily required.

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Laboratory Study on Single Stone Columns Reinforced with Steel Bars and Discs

Cited by 14 publications

References 33 publications

Numerical Simulation of Stiffened Granular Pile

Numerical Simulation of Stiffened Granular Pile

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

Evaluating the Effectiveness of Nonwoven Geotextile-Encased Cinder Gravel Column in Improving Load-Bearing and Deformation Characteristics of Soft Clay

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