Bearing capacity of geogrid reinforced sand over encased stone columns in soft clay

Debnath, Prasenjit; Dey, Ashim Kanti

doi:10.1016/j.geotexmem.2017.08.006

Cited by 90 publications

(31 citation statements)

References 37 publications

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“…columns increases the bearing capacity of the stone column as much as 40%. This is in agreement with findings of Debnath and Dey, [8,17] who reported that stone-column encasement increases the efficiency of stone columns significantly. It worth mentioning that although small scale models have been used in this research, the same behavior has been observed from test results on the full-scale stone columns as reported by Yoo and Lee [22].…”

Section: Numerical Analysissupporting

confidence: 93%

Experimental and numerical study on the bearing capacity of encased stone columns

2020

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Stone columns have attracted considerable attention as a ground improvement techniques recently. Performance of stone columns, however, depends on confining pressure offered by the surrounding soils. In the case of very soft soils, the lateral confining pressure may be insufficient and this may lead to column bulging failure. Encapsulating the individual stone column enhances the lateral resistance against bulging by additional confining pressure. In this study, the influences of the length of encasement and type of aggregate materials on the bearing capacity of a single stone column in both dry sand and clay bed were investigated. The results indicated a clear improvement by encasing the half-length of the column. The numerical study also showed the effect of reinforcement stiffness reduces with increase in the cohesion of the clay. Parametric study showed that the effect of encasement stiffness is insignificant for clay bed with high values of cohesion.

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Section: Numerical Analysissupporting

confidence: 93%

Experimental and numerical study on the bearing capacity of encased stone columns

2020

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“…In their study, a group of 12 stone columns (GP soil, 2.65 Numerical model (Present study) Fig. 3 Comparison of test results [19] and numerical simulation results. Table 1 lists the material used in this study for modeling the soil, foundation and stone columns.…”

Section: Verification and Validationmentioning

confidence: 91%

“…To validate the accuracy of the proposed modeling procedure, experimental study conducted by Debnath and Dey [19] was modeled. In their study, a group of 12 stone columns (GP soil, 2.65 Numerical model (Present study) Fig.…”

Section: Verification and Validationmentioning

confidence: 99%

Machinery/Service system Scheduled Replacement time determination: A combine Weighted Aggregated Sum Product Assessment, Additive Ratio Assessment and Age Replacement Model approach

Emovon¹,

Mgbemena²

2018

IJIE

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“…Stone columns have been widely accepted as a ground improvement technique. It is well established in literature that reinforcing of soft clay, marine soils, with the construction of stone columns improves the load bearing capacity and significantly reduces the ground settlement under heavy loads [1][2][3][4][5][6][7]. Numerous studies have concluded that stone columns usually fail by bulging and encasing the columns leads to significantly higher load carrying capacities [2,6,8,9]; columns having a smaller diameter have higher load carrying capacity than larger diameter columns [2,10].…”

Section: Introductionmentioning

confidence: 99%

“…It is well established in literature that reinforcing of soft clay, marine soils, with the construction of stone columns improves the load bearing capacity and significantly reduces the ground settlement under heavy loads [1][2][3][4][5][6][7]. Numerous studies have concluded that stone columns usually fail by bulging and encasing the columns leads to significantly higher load carrying capacities [2,6,8,9]; columns having a smaller diameter have higher load carrying capacity than larger diameter columns [2,10]. Various studies reported that bulging varied between a depth of about 3-6 times the stone column diameter and load carrying capacity of the columns did not increase significantly beyond an optimum l/d ratio [3,6,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Behaviour of Encased Stone Columns with Partial Content of Shredded Tyre Chips in Soft Clay Bed

Mazumder

Ayothiraman

2021

Int. J. of Geosynth. and Ground Eng.

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The utility of construction of stone columns in soft soil like clay, marine soil in coastal regions as a ground improvement technique is widely acknowledged. This study presents a numerical analysis of behaviour of ordinary and encased columns, made of various mix proportions of shredded tyre chips and stone aggregates, through Finite Element modelling (with Plaxis 3D software). It is observed that encased columns exhibited remarkable decrease in bulging with respect to ordinary columns. This was true even for columns composed of high proportion of tyre chips (50-100% by volume) owing to generation of higher hoop strain in such columns. The development of hoop strain increased the tensile strength of encasement and hence the column stiffness. The study illustrates the variation of maximum lateral deformation and the corresponding depth with the amount of tyre chips in the mix proportion forming the column. A decrease in bulging along with bulging at greater depths was observed in encased columns, the bulging was negligible for columns wherein the tyre content varied between 0 and 30% by volume. The settlement reduced remarkably with the construction of encased columns irrespective of the mix proportions composing the columns. The study concludes that partial replacement (30-70% by volume) of stone aggregates with shredded tyre chips in encased columns in soft soil is feasible with encasement of significant stiffness.

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Bearing capacity of geogrid reinforced sand over encased stone columns in soft clay

Cited by 90 publications

References 37 publications

Experimental and numerical study on the bearing capacity of encased stone columns

Experimental and numerical study on the bearing capacity of encased stone columns

Machinery/Service system Scheduled Replacement time determination: A combine Weighted Aggregated Sum Product Assessment, Additive Ratio Assessment and Age Replacement Model approach

Numerical Study on Behaviour of Encased Stone Columns with Partial Content of Shredded Tyre Chips in Soft Clay Bed

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