Strengthening of clay by geogrid reinforced granular pile

Samadhiya, N. K.; Maheshwari, Piyush; Zsáki, Attila M.; Basu, Partha; Kundu, Ayan

doi:10.3328/ijge.2009.03.03.377-386

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…Numerical studies have been carried out to model the stone column [6,7,8]. Kirsch and Sondermam [9] used finite element method to study the behavior of single and group of stone columns.…”

Section: Introductionmentioning

confidence: 99%

Analytical Study of Load-Settlement Behavior of Soil Treated with Stone Columns have Different Sectional Shape

Al-Obaydi

Al-Kazzaz

2020

KEM

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Stone columns have been used widely to improve the engineering properties of the weak soil. Most of the previous works considered a circular section for the stone columns. In the present study, finite element analysis has been carried out to investigate the effect of stone columns shape and length on the settlement and bearing capacity of soft soil. Accordingly, three types of cross sectional shape for stone columns have been selected which they are circular, rectangular, and square sections with equivalent area. Various length of columns are adopted with diameter of 0.75m that achieved length to diameter or equivalent diameter ratios (L/d=2, 4, 6, 8, and 10) of columns spacing (S/d=3). The results show that the stone columns has tangible effects on the settlement of the soil while has minor effects on the bearing capacity. The settlement of the treated soil with stone columns have L/d=2, reduces by 18.0, 17.3, and 19.3% for circular, rectangular , and square sections respectively. With increasing length of the columns to L/d=10, further reductions in the settlement obtained of (27.1, 28.1, and 27.0%). Bearing capacity of the soil increased slightly with length of the stone columns. Almost all cross sectional shapes of the columns give bearing capacity about same. The increased in the bearing capacity of the treated soil with stone columns have L/d=2, not exceeded 10% for all sectional types. The average increments in bearing capacity when L/d=10 are 12 and 15% at settlement 50 and 100mm respectively. Insignificant changes in bearing capacity upon increasing length of columns from L/d=2 to 10 of maximum 5%. The plastic zone recedes with the increasing length of the stone columns. Finally, from the results obtained, it can be concluded that the stone columns shape has negligible effects on the settlement and bearing capacity of the soil.

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“…Numerical studies have been carried out to model the stone column [6,7,8]. Kirsch and Sondermam [9] used finite element method to study the behavior of single and group of stone columns.…”

Section: Introductionmentioning

confidence: 99%

Analytical Study of Load-Settlement Behavior of Soil Treated with Stone Columns have Different Sectional Shape

Al-Obaydi

Al-Kazzaz

2020

KEM

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“…Many researchers have used geosynthetic material as encasement for stone columns to improve soft soils. Murugesan and Rajagopal (2009;, Gniel and Bouazza (2009), Samadhiya et al (2009), and Hasan and Samadhiya (2016) studied the behavior of geosynthetic/geogrid-encased stone columns and found that the stiffness of soft soil can be improved by increasing the encasement length. Malarvizhi and Ilamparuthi (2004) reported that settlement can be reduced by providing the encasement by increasing the stiffness of the stone column.…”

Section: Introductionmentioning

confidence: 99%

“…The bearing capacity of composite soil increases with column length, but the increase is not significant when the length exceeds beyond six times the column diameter (Ali et al, 2011). Samadhiya et al (2009), Murugesan and Rajagopal (2010), Ali et al (2011), and Hasan and Samadhiya (2016) conducted tests on stone columns of different diameters and concluded that the stiffness of the soil increases with a decrease in the diameter of the column. This is because of the higher confining stresses mobilized on smaller diameter columns.…”

Section: Introductionmentioning

confidence: 99%

“…The bearing improvement ratio also increased with the thickness of the cap, up to 0.4 times the footing diameter. Samadhiya et al (2009) and Hasan and Samadhiya (2016) studied the lateral reinforcement of geogrid strips by varying the vertical spacing and concluded that the load intensity was increased by decreasing the spacing. The strength of granular pile was increased by increasing the length of reinforcement to a depth of three times the diameter and no further increment was observed.…”

Section: Introductionmentioning

confidence: 99%

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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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