Effect of Construction Method on the Performance of Ordinary and Geotextile-Encased Stone Columns

Nazariafshar, Javad; Shafiee, Ali; Mehrannia, Nima

doi:10.1007/s40996-022-00888-9

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…3-Case-borehole or rammed columns method is also used. In this method, the piles are constructed by ramming the granular materials in the prebored holes in stages using heavy falling weight (Ambily and Gandhi et al 2007a;Dheerendra Babu et al 2013;McCabe, Nimmons, and Egan et al 2009;Mokhtari and Kalantari 2012;Nazariafshar et al 2022a). Table I shows the most important references for laboratory studies of weak soils reinforced with Encased stone columns which illustrates the replacement method as the most used method in installation stone columns.…”

Section: Methods Of Stone Columns Constructionmentioning

confidence: 99%

“…Al., (2013) showed that the optimum length of stone columns giving maximum performance improvement is 5 times diameter. Researchers showed that for control of bulging failure mode a minimum L/D=4 (length to diameter of the stone column equal to 4) is required (Ghazavi et al 2013b;Naderi et al 2018b) Others recommended to consider a L/D ratio of greater than 5, to ensure punching shear will not happen (Nazariafshar et al 2022b).…”

Section: Critical Column Lengthmentioning

confidence: 99%

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A Review of Soil Stabilization Using Stone Columns Technique

Foda

AbdelKader

Ibrahim

2023

Delta University Scientific Journal

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Soft clay soils are in many coastal areas, these soils generally have high compressibility and don't provide required bearing capacity. Various techniques are used to improve these soils. The stone column technique has been successfully applied for the ground improvement. A stone columns technique is one of the soil stabilization methods that is used to increase strength, decrease the compressibility of soft and loose fine graded soils, accelerate a consolidation effect, and reduce the liquefaction potential of soils. They are mainly used for stabilization soft soil such as soft clays, silts, and silty sand. Several research has been conducted on the behavior and performance of stone columns with various materials utilized as column filler replacing the normal aggregate. This paper will review extensively on previously conducted research on some of the materials used as stone column backfill materials, its suitability, and the effectiveness as a substitute for regular aggregates in soft soil improvement works. This paper also discusses the techniques and methods of construction of stone columns. The bearing capacity of stone columns, and a combination of both methods in reinforced and unreinforced modes are presented using scaled physical models. The effect of various diameters with various depths in ground also reviewed. Results show that using stone column improves bearing capacity of soft soils and decreasing settlement. Using geotextile as stonecolumn encasement increases the efficiency of stone columns significantly. Finally, some guidance and recommendations are provided on parameter selection for the study of stone columns.

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Section: Methods Of Stone Columns Constructionmentioning

confidence: 99%

Section: Critical Column Lengthmentioning

confidence: 99%

A Review of Soil Stabilization Using Stone Columns Technique

Foda

AbdelKader

Ibrahim

2023

Delta University Scientific Journal

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“…Experimental research on the impact of construction methods on the functionality of stone columns was done by Nazariafshar et al [18]. Stone column models with diameters of (6 and 8 cm), which are a floating type, are both uncased and covered with geotextile and were built using displacement and replacement methods.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Behavior of Stone Columns With Different Area Ratios in Soft Clays

Baqir

2024

GEOMATE

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The single floating stone column behavior in very soft soils with a low undrained shear strength of Cu ≤ 20 kN/m2 was studied in the finite-element method to investigate the influence of stone column's area ratio on the normalized pressure-settlement curves of circular footings of different diameters. The studied cases consist of stone columns of 1.0 m in diameter Ds and lengths Ls of (4 m, 6 m, and 7.5 m). The diameter of footings Df is (1.0 m, 1.2 m, 1.4 m, 1.6 m, 2.0 m, 2.5 m, and 3.5 m) which covers the area ratios with a range of 100 to 8.16 %. A total of 28 runs were carried out using the Ansys program to simulate the case for improved and unimproved soil. In the axisymmetric numerical model, the connection between the stone column and the adjacent contact clay soil was modeled as bonded type. The results of the analysis showed that there is a clear relationship between the bearing ratio (q/cu improved) / (q/cu unimproved) and the normalized settlement (S/Df) of the composite structure and the area ratio Ar% of the stone columns. The deformation ratio (Streated/Suntreated) and the footing diameter are related using a straightforward equation. In comparison to footings with a low area ratio, the footing displays a lower value of settling when subjected to the same pressure. By decreasing the diameter of the footing, the normalized settlement decreases for the same normalized q/cu values. The bearing ratio depends on the stone column length ratio Ls/Ds and settlement ratio. It is from 2.2 at a 100% area ratio and 1.23 at a 16% area ratio.

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