Experimental Analysis of Embankment on Ordinary and Encased Stone Columns

Fattah, Mohammed Y.; Zabar, Bushra S.; Hassan, Hanan A.

doi:10.1061/(asce)gm.1943-5622.0000579

Cited by 91 publications

(28 citation statements)

References 21 publications

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“…They also found that the settlement increased and the load-carrying capacity decreased with an increase in spacing up to an L/D ratio of 3 (beyond this, the change was negligible). For stone columns reinforced to L = 2D the improvement ratio was very high and the settlement reduction ratio was very low (Fattah et al, 2016).…”

Section: Introductionmentioning

confidence: 90%

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Performance of Encased Silica-Manganese Slag Stone Columns in Soft Marine Clay

Prasad¹,

P.V.V²

2019

IJTech

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Stone columns are the most suitable and economical ground improvement technique for soft soils. Stone columns accelerate the consolidation process, thereby increase the stiffness of the soil. This increase may not be sufficient because of the less lateral confinement, which leads to excessive bulging. The strength of the composite soil can also be increased further by encasing the column with geotextile. In this paper, model tests were conducted on end-bearing stone columns with geotextile encasement and compared with the unreinforced (plain) stone columns. The stone columns were prepared by placing the silica-manganese slag, sand and were reinforced with geotextile with different encasement lengths of D, 2D, 3D, and 4D (D is the stone column diameter; i.e., 5 cm). The tests demonstrated that the engineering behavior of the soil was improved by introducing the silica-manganese slag (when compared with conventional stone columns) and also with encasement. Bulging can also be reduced by providing encasement beyond the zone of bulging.

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Section: Introductionmentioning

confidence: 90%

“…This is because of the higher confining stresses mobilized on smaller diameter columns. Fattah et al (2016) studied the behavior of stone columns in embankments and concluded that the Stress Concentration Ratio (SCR; the ratio of the stresses in the column to the surrounding soil) increases gradually with increasing L/D ratio.…”

Section: Introductionmentioning

confidence: 99%

Performance of Encased Silica-Manganese Slag Stone Columns in Soft Marine Clay

Prasad¹,

P.V.V²

2019

IJTech

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“…The geogrid encasement of a stone column greatly decreases the lateral displacement compared with an ordinary stone column. Fattah et al (2014a and b) investigated the behavior of embankment models resting on soft soil reinforced with stone columns. Model tests were performed with different spacing distances between the stone columns and the two length-to-diameter ratios of the stone columns, in addition to the different embankment heights.…”

Section: Geogrid Encased Stone or Sand Columnsmentioning

confidence: 99%

Numerical Simulation Of The Treatment Of Soil Swelling Using Grid Geocell Columns

Fattah

Al-Omari

Ali

2015

Slovak Journal of Civil Engineering

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In this paper, a method for the treatment of the swelling of expansive soil is numerically simulated. The method is simply based on the embedment of a geogrid (or a geomesh) in the soil. The geogrid is extended continuously inside the volume of the soil where the swell is needed to be controlled and orientated towards the direction of the swell. Soils with different swelling potentials are employed: bentonite base-Na and bentonite base-Ca samples in addition to kaolinite mixed with bentonite. A numerical analysis was carried out by the finite element method to study the swelling soil's behavior and investigate the distribution of the stresses and pore water pressures around the geocells beneath the shallow footings. The ABAQUS computer program was used as a finite element tool, and the soil is represented by the modified Drucker-Prager/cap model. The geogrid surrounding the geocell is assumed to be a linear elastic material throughout the analysis. The soil properties used in the modeling were experimentally obtained. It is concluded that the degree of saturation and the matric suction (the negative pore water pressure) decrease as the angle of friction of the geocell column material increases due to the activity of the sand fill in the dissipation of the pore water pressure and the acceleration of the drainage through its function as a drain. When the plasticity index and the active depth (the active zone is considered to be equal to the overall depth of the clay model) increase, the axial movement (swelling movement) and matric suction, as a result of the increase in the axial forces, vary between this maximum value at the top of the layer and the minimum value in the last third of the active depth and then return to a consolidation at the end of the depth layer.

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“…As such, many researchers advocate for resorting to stone column or geosynthetic-encased stone column technique of ground improvement, in particular, for soft soils, wherein settlements and stability, in tandem, are prime concerns to be addressed [44][45][46]. Stone columns develop bearing capacity by bulging deformation and lateral confinement offered by the surrounding soil [34].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Railway Embankment Supported with Geosynthetic-Encased Stone Columns in Soft Clays: A Case Study

Deshpande

Kumar

Begum

et al. 2021

Int. J. of Geosynth. and Ground Eng.

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Construction on soft soils is a promising task, as it is necessary for engineers to overcome challenges of excess settlements and possible bearing failure. This paper deals with proposing a suitable ground improvement technique as a remedy for an already failed railway embankment and evaluating the performance of the proposed technique both in short-and long-term periods. Based on the prevailing site conditions (i.e. poor shear strength) and obligatory to complete the work within the stipulated time, it is found that geosynthetic-encased stone column (ESC) is a preferred ground improvement technique. An extensive 2D finite element analysis has been undertaken to examine the improvement in bearing capacity concurrently addressing slope stability problem for different column spacing of 1.5, 2, 2.5, 3, 3.5, and 4 m. Interpretation of results revealed that bearing capacity and stability are critical in the short-term period. The results further demonstrated that ESCs by undergoing lateral deflection and bulging, which are found to predominate in the short-term period, sustained the failure against bearing capacity and stability. The spacing of 3 m when considered bearing capacity alone and 2.5 m corresponding to lateral deflection alone is found optimal. Based on the outcome of the study, it is demonstrated that the proposed ESC is an ideal solution of ground improvement for the present case study of failed railway embankment.

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Experimental Analysis of Embankment on Ordinary and Encased Stone Columns

Cited by 91 publications

References 21 publications

Performance of Encased Silica-Manganese Slag Stone Columns in Soft Marine Clay

Performance of Encased Silica-Manganese Slag Stone Columns in Soft Marine Clay

Numerical Simulation Of The Treatment Of Soil Swelling Using Grid Geocell Columns

Analysis of Railway Embankment Supported with Geosynthetic-Encased Stone Columns in Soft Clays: A Case Study

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