Bearing capacity of square footings on reinforced layered soil

Kumar, Arvind; Walia, Baljit Singh

doi:10.1007/s10706-005-8852-y

Cited by 22 publications

(6 citation statements)

References 25 publications

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“…Figure 3 shows the typical layout of multi-layered geogrid reinforced sand bed adopted as a conventional layout of uniform reinforced base in which all geogrid layers have the same plan size. Based on previous experiences such as those reported by Abdrabbo et al [30], Gosh et al [18], Kumar and Walia [19], Latha and Somwanshi [24], the depth of placement of the rst reinforcement layer from the bottom face of the footing, u, and the spacing between consecutive layers of reinforcement, h, both were selected to be 0:3B in which B is the footing width. The optimal number of reinforcement layers was adopted to be 3 for the uniform reinforcement layouts, although up to 4 layers were used in dissimilar reinforcement arrangements.…”

Section: Geogrid Placement Con Gurationsmentioning

confidence: 99%

“…The focus of most of these studies was on strip footing models and the length of reinforcing layers for achieving maximum bearing capacity found to be in a range of 5 to 8 times of footing width. Several other studies on the bearing capacity of square footings on reinforced soils have also been reported, amongst them may be referred to Omar et al (1993), Adams and Collin (1997) [14][15][16][17][18][19][20][21][22][23][24]. In more recent research studies, Bai et al (2013) conducted large site loading on a square footing placed on a geobelt-reinforced crushed stone layer underlain by a soft soil [25].…”

Section: Introductionmentioning

confidence: 99%

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Bearing Capacity of Square Footings on Sand Reinforced with Dissimilar Geogrid Layers

Rowshanzamir

Karimian²

2016

Scientia Iranica

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This paper aims to investigate the likely e ects of geogrid reinforcement con guration on the bearing capacity of footings. Using geogrid reinforcement layers with certain total areas in various uniform and non-uniform arrangements, the bearing capacities of footing models on reinforced sand beds were determined and compared. The rst arrangement was the conventional uniform layout in which three geogrid layers of equal dimensions were considered. In the second group, the same amount of geogrids was used in a trapezoidal pro le in which smaller sized geogrids were placed at upper layers and the geogrid dimensions increased with embedment depth. The third group consisted of arrangements in which the same amount of geogrids was used in an inverse trapezoidal layout, i.e. the layer sizes decreased with embedment depth. The e ect of soil density on the footing performance was also investigated. The tests results indicated that in all soil densities, the greatest bearing capacities were obtained for the sand beds reinforced with inverse trapezoidal reinforcement layouts, while the least bearing capacities were determined for trapezoidal arrangements. The improvement ratio of bearing capacity due to geogrid reinforcement varied from 1.8 to 5.35 depending on the reinforcement layout and the sand bed density.

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Section: Geogrid Placement Con Gurationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bearing Capacity of Square Footings on Sand Reinforced with Dissimilar Geogrid Layers

Rowshanzamir

Karimian²

2016

Scientia Iranica

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“…The maximum benefit from inclusion of reinforcement is achieved when it is placed within the zone of influence of applied loading. Several researchers have conducted experiments to find the optimum depth of first layer of reinforcement when number of reinforcement layers were used [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The maximum improvement in bearing capacity of footing was achieved when the top layer of reinforcement was embedded within 0.25 times the size of the footing from the surface. Kumar and Walia [4] performed model tests on a square footing resting on a two-layer system with the top layer reinforced with geogrid. Thicknesses of the top and bottom layers were varied from 0.5 to 2.0 m and 2.0 to 3.5 m, respectively.…”

Section: Introductionmentioning

confidence: 99%

Load-Settlement Response of Square Footing on Geogrid Reinforced Layered Granular Beds

Prasad

Chennarapu

Balunaini

2016

Int. J. of Geosynth. and Ground Eng.

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Experimental studies were carried out to obtain the load-settlement response of a model square footing resting on unreinforced and reinforced granular beds. The response was obtained for two cases: (a) geogrid-reinforced sand layer, and (b) geogrid-reinforced layered system consisting of aggregate layer overlying a sand layer. The parameters considered in the experimental study include the thickness of the aggregate layer, the depth of geogrid reinforcement placed in sand layer and in aggregate layer, width of the reinforcement, and relative density of bed. Plate vibrator was used to compact uniform sand beds to relative densities equal to 50 % and 70 % inside large-size test chamber of dimensions equal to 1 m 9 1 m 9 1 m (in length, in width, and in depth). Load was applied on square footing using a 100 kN capacity actuator in displacementcontrolled mode, and the improvement in the load carrying capacity of the footing resting on reinforced sand layer and layered system was quantified in terms of load improvement factors. In addition, the optimum embedment depth and width of reinforcements were proposed for various cases considered in the study. The optimum depth of reinforcement for the case of aggregate layer overlying sand layer decreased to 0.30 times the width of the footing from 0.45 times the width of the footing for sand only case.

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“…More recently, results of several numerical studies, laboratory and large scale tests to determine the ultimate bearing capacity of square shallow foundations supported by sand reinforced with layers of geogrid have been published in the literature (e.g. Akinmusuru and Akinbolade 1981;Guido et al 1985Guido et al , 1986Omar et al 1993;Yetimoglu et al 1994;Ismail and Raymond 1995;Adams and Collin 1997;Kumar and Saran 2003;Kumar and Saran 2006;Chung and Cascante 2006;Saran et al 2007). In this paper a new reinforcement element to improve bearing capacity of sands (patented in I.R.I) has been introduced and experimentally studied.…”

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confidence: 99%

Experimental Study of Bearing Capacity of Granular Soils, Reinforced with Innovative Grid-Anchor System

2007

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The pull-out resistance of reinforcing elements is one of the most significant factors in increasing the bearing capacity of geosynthetic reinforced soils. In this research a new reinforcing element that includes elements (anchors) attached to ordinary geogrid for increasing the pull-out resistance of reinforcements is introduced. Reinforcement therefore consists of geogrid and anchors with cubic elements that attached to the geogrid, named (by the authors) Grid-Anchor. A total of 45 load tests were performed to investigate the bearing capacity of square footing on sand reinforced with this system. The effect of depth of the first reinforcement layer, the vertical spacing, the number and width of reinforcement layers, the distance that anchors are effective, effect of relative density, low strain stiffness and stiffness after local shear were investigated. Laboratory tests showed that when a single layer of reinforcement is used there is an optimum reinforcement embedment depth for which the bearing capacity is the greatest. There also appeared to be an optimum vertical spacing of reinforcing layers for multi-layer reinforced sand. The bearing capacity was also found to increase with increasing number of reinforcement layer, if the reinforcement were placed within a range of effective depth. The effect of soil density also is investigated. Finally the results were compared with the bearing capacity of footings on non-reinforced sand and sand reinforced with ordinary geogrid and the advantages of the Grid-Anchor were highlighted. Test results indicated that the use of Grid-Anchor to reinforce the sand increased the ultimate bearing capacity of shallow square footing by a factor of 3.0 and 1.8 times compared to that for un-reinforced soil and soil reinforced with ordinary geogrid, respectively.

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Bearing capacity of square footings on reinforced layered soil

Cited by 22 publications

References 25 publications

Bearing Capacity of Square Footings on Sand Reinforced with Dissimilar Geogrid Layers

Bearing Capacity of Square Footings on Sand Reinforced with Dissimilar Geogrid Layers

Load-Settlement Response of Square Footing on Geogrid Reinforced Layered Granular Beds

Experimental Study of Bearing Capacity of Granular Soils, Reinforced with Innovative Grid-Anchor System

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