A Critical Review of Construction, Analysis and Behaviour of Stone Columns

Babu, M. R. Dheerendra; Nayak, Sitaram; Shivashankar, R.

doi:10.1007/s10706-012-9555-9

Cited by 69 publications

(19 citation statements)

References 71 publications

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“…However, the use of the unit cell model resulted in a higher stress transfer to the column than the plane strain model. There is a clear difference between the failure modes of a group of stone columns and an isolated column, where the columns can interact and restrain the expansion of the adjacent columns [15]. According to McKelvey et al [16], in a group of stone columns, the central column deforms or bulges uniformly, whereas the column at the edge bulges away from neighbouring columns, as occurred in the current study (see Figure 7).…”

Section: Resultssupporting

confidence: 58%

Comparison between unit cell and plane strain models of stone column ground improvement

Gaber

Kasa

Rahman

et al. 2018

IJET

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This article presents a comparative study of the behaviour of clayey soil reinforcements using stone column ground improvement by means of numerical analyses. Two-dimensional finite element analyses with commercially available software, PLAXIS, were performed on end-bearing stone columns using 15-noded triangular elements to investigate the impact of the modelling type on the stress concentration ratio and failure mechanism of an improved foundation system. Consolidation analyses were conducted throughout the study using Mohr-Coulomb’s criterion. The computed values of the stress concentration ratios were compared for different key parameters, including the diameters of stone columns, c/c spacing of columns, friction angle of stone column material, and undrained cohesion of soft soil. The major conclusions of this study were that the stone column in the unit cell model shared between 2.5 to 3.14 times more loads than the surrounding soil, whilst in the plane strain model it shared between 1.7 to 2.9 times more loads. The use of plane strain approach to model the stone column gave a more comprehensive representation of the stress distribution and load transfer between the soil and columns, in addition to being a better method than the unit cell concept to evaluate the failure mode in this system.

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Section: Resultssupporting

confidence: 58%

Comparison between unit cell and plane strain models of stone column ground improvement

Gaber

Kasa

Rahman

et al. 2018

IJET

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“…Similar to the critical-length, the stress concentration ratio (n) rises as the undrained-cohesion of the soft-soil decreases [29], resulting in more stresses reported to the column, which in turn transfers them to great depths in the soil. In other words, stress concentration on the surface of the column increases with the increase on the stiffness ratio (Ec/Es) [33], where Ec and Es are the Young's modulus of the stone column and the soft soil, and by taking in consideration the proportional relation between the undrained-cohesion (Cu) and young's modulus (Es) of the surrounding soil [32], it can be concluded that the increase of the undrained-cohesion lead to decrease in the stress concentration, consequently, the critical length decrease. As=25.5% As=32.5% As=40%…”

Section: Influence Of the Undrained-cohesion On The Critical-length Ratiomentioning

confidence: 99%

Optimization of the Ultimate Bearing Capacity of Reinforced Soft Soils through the Concept of the Critical Length of Stone Columns

et al. 2021

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The objective of this paper is to develop an analytical equation based on the concept of the critical-length of columns in order to optimize the ultimate bearing-capacity of soft soils, supporting a strip footing and reinforced by a group of floating stone columns. Optimization procedure was performed on three-dimensional numerical models simulated on the Flac3D computer code, for various soft-soils with different undrained-cohesions (Cu=15–35kPa), reinforced by columns of varying lengths (L) and area replacement ratio (As=10-40%), considering different footing widths B. Obtained results indicate that the optimal bearing-capacity ratio (Ultimate bearing-capacity of reinforced soil/unreinforced soil) is reached for the column critical-length ratio (Lc/B) and increase with increase of the later ratio, depending on As and Cu. Analysis of results also showed that the optimal values of the bearing-capacity ratio in the reinforced soils remain bounded between the lower and higher values (1.28-2.32), respectively for minimal and maximal values of the critical-length ratio (1.1) and (4.4). Based on these results, a useful analytical equation is proposed by the authors, for the expression of the critical-length; thus ensuring an optimal pre-dimensioning of the stone columns. The proposed equation was compared with the data available in the literature and showed good agreement. Doi: 10.28991/cej-2021-03091737 Full Text: PDF

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“…Stone columns became well established in France in the 1830s. It was apparently used to improve native soil [2] . In Germany stone column was used for the first time in the mid-1930s and it used on frequently in Europe and North America since the 1950s and 1972, respectively [1,3] .…”

Section: Introductionmentioning

confidence: 99%

Improving bearing capacity of weak soils: A review

Saleh

2021

j. of constr. res.

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Weak soils, such as soft clay and loose sand, have a poor bearing capacity, making them incapable of bearing the load of superstructures that will be imposed on them. As a result, engineers must have a solution to the issue of poor bearing capacity in weak soils before embanking into building on them. This paper reviewed the use of stone columns, piled rafts, and geogrids for improving the bearing capability of weak soils. Important findings from recent research are also discussed. From the review of the previous researcher’s findings, it was found that modelling approaches such as physical modelling (full scale, centrifuge, laboratory scale) and numerical modelling are used to study bearing capacity improvement.

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A Critical Review of Construction, Analysis and Behaviour of Stone Columns

Cited by 69 publications

References 71 publications

Comparison between unit cell and plane strain models of stone column ground improvement

Comparison between unit cell and plane strain models of stone column ground improvement

Optimization of the Ultimate Bearing Capacity of Reinforced Soft Soils through the Concept of the Critical Length of Stone Columns

Improving bearing capacity of weak soils: A review

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