Experimental and numerical analyses of circular footing on geogrid-reinforced granular fill underlain by soft clay

Demir, Ahmet; Yildiz, Abdulazim; Laman, Mustafa; Örnek, Murat

doi:10.1007/s11440-013-0207-x

Cited by 84 publications

(22 citation statements)

References 26 publications

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“…The geogrid is considered to play an important role in improving the performance of pile-supported reinforced embankments by means of increasing the loading efficiency of the piles Huang and Han, 2009;Deb and Mohapatra, 2013;Xing et al, 2014). In addition, it has been proven that the geogrid can help facilitate in controlling the lateral displacement of the embankment and the settlement of the subsoil (Chai et al, 2002;Rowe and Li, 2005;Zheng et al, 2009;Demir et al, 2014;Rowe and Liu, 2015). The tensile force of the geogrid is directly related to the service performance of the geogrid.…”

Section: Introductionmentioning

confidence: 99%

Tensile force of geogrids embedded in pile-supported reinforced embankment: A full-scale experimental study

Chen

Wang

et al. 2016

Geotextiles and Geomembranes

106

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Section: Introductionmentioning

confidence: 99%

Tensile force of geogrids embedded in pile-supported reinforced embankment: A full-scale experimental study

Chen

Wang

et al. 2016

Geotextiles and Geomembranes

106

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“…These studies are generally meant for reinforced strip foundations. In the recent past, a few experimental and analytical studies have also been undertaken to examine the behavior of circular footings placed on reinforced soil media (Boushehrian and Hataf, 2003;Basudhar et al, 2007;Sireesh et al, 2009;Lovisa et al, 2010;Chakraborty and Kumar, 2012;Lavasan and Ghazavi, 2012;Ornek et al, 2012;Demir et al, 2013). Boushehrian and Hataf (2003) have performed a series of laboratory tests, along with a numerical analysis, to examine the effect of the depth of the first layer of the reinforcement, vertical spacing and number of reinforcement layers on the bearing capacity of foundations.…”

Section: Introductionmentioning

confidence: 99%

“…Chakraborty and Kumar (2012), by using the lower bound theorem of the limit analysis in conjunction with finite elements and linear optimization, have determined the bearing capacity of a circular foundation placed over soils which are embedded with a single layer of horizontal circular reinforcement sheet. Demir et al (2013) have carried out experimental and numerical investigations, by using Plaxis 3D, for determining the bearing capacity of a circular footing resting over granular fill reinforced with geogrid sheet overlying natural clay deposit. In the present research, the bearing capacity of a circular foundation embedded with single and two horizontal layers of the reinforcements in the form of circular geogrid sheets, has been determined by using the upper bound finite elements limit analysis in combination with linear optimization.…”

Section: Introductionmentioning

confidence: 99%

Bearing capacity of circular foundations reinforced with geogrid sheets

Chakraborty

Kumar

2014

Soils and Foundations

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The ultimate bearing capacity of a circular footing, placed over a soil mass which is reinforced with horizontal layers of circular reinforcement sheets, has been determined by using the upper bound theorem of the limit analysis in conjunction with finite elements and linear optimization. For performing the analysis, three different soil media have been separately considered, namely, (i) fully granular, (ii) cohesive frictional, and (iii) fully cohesive with an additional provision to account for an increase of cohesion with depth. The reinforcement sheets are assumed to be structurally strong to resist axial tension but without having any resistance to bending; such an approximation usually holds good for geogrid sheets. The shear failure between the reinforcement sheet and adjoining soil mass has been considered. The increase in the magnitudes of the bearing capacity factors (N c and N γ ) with an inclusion of the reinforcement has been computed in terms of the efficiency factors η c and η γ . The results have been obtained (i) for different values of ϕ in case of fully granular (c ¼ 0) and c Àϕ soils, and (ii) for different rates (m) at which the cohesion increases with depth for a purely cohesive soil (ϕ ¼ 0 ○ ). The critical positions and corresponding optimum diameter of the reinforcement sheets, for achieving the maximum bearing capacity, have also been established. The increase in the bearing capacity with an employment of the reinforcement increases continuously with an increase in ϕ. The improvement in the bearing capacity becomes quite extensive for two layers of the reinforcements as compared to the single layer of the reinforcement. The results obtained from the study are found to compare well with the available theoretical and experimental data reported in literature.

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“…Demir reported that the increased normal stress led to the increased shear stress (Demir, A., Yildiz, A., Laman, M., & Ornek, M. 2014) and the increased geosynthetic tensile strength led to the increased apparent friction angle. These results are in line with the results of the present study.…”

Section: Resultsmentioning

confidence: 99%

Study on the Impact of Strain Rate and Loading Speed on Geogrid-Reinforced Soil

Zarringol

2017

JSD

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During the past decades, reinforced soil has normally been constructed by coarse grained soil. Recently, low quality and locally accessible materials have been successfully used in reinforced soil due to economic observations. Loading speed is one of the effective factors in soil-geosynthetic interaction. In order to determine the impact of this factor, we carried out a pullout test on the samples with dimensions of 30×30×17 cm under four strain rates of 0.75, 1.25, 1.75 and 2.25 mm/min and three vertical stress rates of 20, 50 and 80 KN/m 2 . The results of this study indicated that the mobilization of geosynthetic strength in contact area depends on the amount of vertical stress. The increased vertical stress results in the increased shear strength in clay-geogrid contact area. Furthermore, the increased strain rate results in the reduced shear strength.

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Experimental and numerical analyses of circular footing on geogrid-reinforced granular fill underlain by soft clay

Cited by 84 publications

References 26 publications

Tensile force of geogrids embedded in pile-supported reinforced embankment: A full-scale experimental study

Tensile force of geogrids embedded in pile-supported reinforced embankment: A full-scale experimental study

Bearing capacity of circular foundations reinforced with geogrid sheets

Study on the Impact of Strain Rate and Loading Speed on Geogrid-Reinforced Soil

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