Modelling vibrated stone columns in soft clay

McKelvey, David; Sivakumar, V.; Bell, A. L.; Graham, J.

doi:10.1680/geng.157.3.137.42416

Cited by 36 publications

(27 citation statements)

References 5 publications

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“…All the experiments were conducted on floating granular columns in soft soil in unit cell tanks so that the L/D ratio (length of column/ diameter of column) was a minimum of 6, which is required to develop the full limiting axial stress on the column (McKelvey et al, 2004). The total height of the soft soil bed placed in the tank was eight times the diameter of the column.…”

Section: Experimental Programmementioning

confidence: 99%

Performance of granular columns in dispersive soils

Nayak¹,

Babu²,

Shivashankar³

et al. 2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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The soils found abundantly along the Konkan belt in peninsular India are lateritic soils and lithomargic clays. The locally available lithomargic clayey soils are problematic in the sense that their strength reduces drastically under saturation conditions, which is typical behaviour of the dispersive type of soil. Most foundations are placed on this soil layer. This paper presents results from a series of laboratory plate load tests carried out in unit cell tanks to investigate the behaviour of granular columns in these weak (lithomargic clay) grounds. Tests are carried out with two types of loading: with the entire area in the unit cell tank loaded, to estimate the stiffness of the improved ground; and with only the granular column area loaded, to estimate its limiting axial capacity. Investigations were carried out by varying the area ratio (or spacing), diameter of granular columns, end condition and column configuration. The load-settlement behaviour, stiffness and bulging behaviour of granular columns are analysed. It is found that the ground treated with granular columns exhibits a high load-carrying capacity and stiffness, and a significant reduction in settlement, compared with the untreated ground.

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Section: Experimental Programmementioning

confidence: 99%

Performance of granular columns in dispersive soils

Nayak¹,

Babu²,

Shivashankar³

et al. 2014

Proceedings of the Institution of Civil Engineers - Geotechnica

View full text Add to dashboard Cite

show abstract

“…2. All the experiments were conducted on floating stone columns in layered soil beds in unit cell tanks so that L/D ratio (length of the column/diameter of the column) is a minimum of 6, which is required to develop the full limiting axial stress on the column (McKelvey et al 2004). The total height of the layered soil bed placed in the tank was 8 times the diameter of the column.…”

Section: Experimental Programmementioning

confidence: 99%

Experimental Studies on Behaviour of Stone Columns in Layered Soils

et al. 2011

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Stone columns are found to be effective and economical ground improvement technique in soft grounds. Understanding its behaviour when they are installed in stratified soils, in particular when the upper layer consists of weak soil, will be of great practical significance. This paper presents results from a series of laboratory plate load tests carried out in unit cell tanks to investigate the behaviour of stone columns in layered soils, consisting of weak soft clay overlying a relatively stronger silty soil, for various thicknesses of the top layer. Tests were carried out with two types of loading (1) the entire area in the unit cell tank loaded, to estimate the stiffness of improved ground and (2) only the stone column loaded, to estimate the limiting axial capacity. Laboratory tests were carried out on a column of 90 mm diameter surrounded by layered soil, for an area ratio of 15%. It is found that the depth of top weak layer thickness has a significant influence on the stiffness, load bearing capacity and bulging behavior of stone columns.

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“…The other parameter considered was the diameter of the nails (d ), which was varied by using steel bars with diameters of 2 and 4 mm. All the experiments were conducted on floating stone columns in soft soil in unit cell tanks so that the ratio of the length of the column to its diameter (L/D) was a minimum of 6, which is required to develop the full limiting axial stress on the column (McKelvey et al, 2004). The total height of the clay bed placed in the tank was eight times the diameter of the column.…”

Section: Experimental Programmementioning

confidence: 99%

Performance of stone columns with circumferential nails

Nayak¹,

Shivashankar²,

Babu³

2011

Proceedings of the Institution of Civil Engineers - Ground Impr

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Stone columns are often used as an effective technique for improving the performance of soft ground. Stone columns derive their load-carrying capacity due to lateral confinement from the surrounding soil. Very soft soils offer very low lateral confinement, leading to large settlements and low load-carrying capacities. In this paper, an alternative method of enhancing the performance of stone columns in soft soils by reinforcing the stone columns with circumferential nails driven vertically is suggested. The method was developed in laboratory-scale model tests and a series of plate load tests were performed in unit cell tanks to investigate the performance of stone columns reinforced with circumferential nails. The investigation was carried out by varying the depth of nails below ground level, the number of nails and the diameter of nails with different diameter stone columns and area ratios (or spacing). It was found that the circumferentially reinforced stone columns have much higher load-carrying capacity with a significant reduction in settlement and less lateral bulging in comparison with plain stone columns.

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Modelling vibrated stone columns in soft clay

Cited by 36 publications

References 5 publications

Performance of granular columns in dispersive soils

Performance of granular columns in dispersive soils

Experimental Studies on Behaviour of Stone Columns in Layered Soils

Performance of stone columns with circumferential nails

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