Numerical modelling of stone columns beneath a rigid footing

Castro, José Villaverde

doi:10.1016/j.compgeo.2014.03.016

Cited by 52 publications

(40 citation statements)

References 18 publications

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“…It can be noted that the spacing between stone columns slightly influences on the improvement ratio. For low replacement ratio (<10%), the improvement ratio is almost constant, which agreed well with Castro (2014) observation. However, the improvement ratio reduces with the increase of the columns spacing ratio; for higher replacement ratio (20%, and 30%), which confirm that for small spacing between columns, the lateral support from the surrounding soil increases and accordingly, will show significant improvement.…”

Section: Parametric Studysupporting

confidence: 79%

Bearing Capacity of Strip Foundation on Soft Soil Reinforced with Stone Columns Using Method of Slices

Khalifa

Etezad

Hanna

et al. 2017

Soil Testing, Soil Stability and Ground Improvement

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Abstract. Stone columns are recognized as an environmently-friendly and cost-effective ground improvement technique. Stone columns are used in soft soil to increase the bearing capacity, reduce the settlement, increase the rate of settlement and reduce the liquefaction potential of the ground. This paper presents an analytical model utilizing the method of slices to predict the ultimate bearing capacity of the soil reinforced with a group of stone columns. The soil within the failure zone was divided into slices and the limit equilibrium technique was adopted to perform the analysis. Shear forces and passive earth pressure on the boundaries of each slice were determined. By utilizing a circular failure plane, the minimum inter-slice force coefficients were determined.The analysis was carried out using the Morgenstern-Price method to estimate the failure surface together with the bearing capacity of the reinforced ground. The failure surface was determined by trial and error to estimate the minimum factor of safety. The ultimate bearing capacity was defined by increasing the foundation load until the factor of safety of one was obtained. Results of the present theory were compared with those available in the literature, where a good agreement between the two was noted.

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Section: Parametric Studysupporting

confidence: 79%

Bearing Capacity of Strip Foundation on Soft Soil Reinforced with Stone Columns Using Method of Slices

Khalifa

Etezad

Hanna

et al. 2017

Soil Testing, Soil Stability and Ground Improvement

View full text Add to dashboard Cite

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“…The presented analytical model does not consider column punching or penetration into the underlying soil, but that is not possible for end-bearing columns and is small for columns lengths equal or higher than the critical length [13], which will be assumed on the safe side as 2B in this paper.…”

Section: Column Lengthmentioning

confidence: 99%

“…Ng [12] and Castro [13] have shown that for a non-stratified soil profile, there is a critical column length, whose value is around 1.5-2 times the footing width, B, for settlement reduction. Castro [13] also shows that for failure conditions, i.e. for bearing pressure, the critical length is lower, around 0.5B.…”

Section: Column Lengthmentioning

confidence: 99%

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An analytical solution for the settlement of stone columns beneath rigid footings

Castro

2014

Acta Geotech.

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This paper presents a new approximate solution to study the settlement of rigid footings resting on a soft soil improved with groups of stone columns. The solution development is fully analytical, but finite element analyses are used to verify the validity of some assumptions, such as a simplified geometric model, load distribution with depth and boundary conditions. Groups of stone columns are converted to equivalent single columns with the same cross-sectional area. So, the problem becomes axially symmetric. Soft soil is assumed as linear elastic but plastic strains are considered in the column using the Mohr-Coulomb yield criterion and a non-associated flow rule, with a constant dilatancy angle. Soil profile is divided into independent horizontal slices and equilibrium of stresses and compatibility of deformations are imposed in the vertical and horizontal directions. The solution is presented in a closed form and may be easily

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“…Due to these limitations of physical modeling, it is necessary to develop numerical technique to overcome them. The numerical technique so is investigated by many researchers [10][11][12][13][14][15][16][17][18][19][20].…”

mentioning

confidence: 99%

Numerical investigation of stone columns system for liquefaction and settlement diminution potential

2017

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Numerical modelling of stone columns beneath a rigid footing

Cited by 52 publications

References 18 publications

Bearing Capacity of Strip Foundation on Soft Soil Reinforced with Stone Columns Using Method of Slices

Bearing Capacity of Strip Foundation on Soft Soil Reinforced with Stone Columns Using Method of Slices

An analytical solution for the settlement of stone columns beneath rigid footings

Numerical investigation of stone columns system for liquefaction and settlement diminution potential

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