Closely Spaced Footings on Geogrid-Reinforced Sand

Kumar, Arvind; Saran, Swami

doi:10.1061/(asce)1090-0241(2003)129:7(660)

Cited by 101 publications

(31 citation statements)

References 8 publications

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“…One new application, the construction of reinforced soil foundation to support a shallow spread footing has a considerable potential as a cost-effective alternative to conventional methods of support. The beneficial effects of using tensile reinforcement to increase the bearing capacity of homogeneous sands have been clearly demonstrated by several investigators (Binquet and Lee 1975a, b;Akinmusuru and Akinbolade 1981;Das and Larbi-Cherif (1983); Fragaszy and Lawton 1984;Guido et al 1986;Huang and Tatsuoka 1990;Dixit and Mandal 1993;Khing et al 1993Khing et al , 1994Murthy et al 1993;Yetimoglu et al 1994;Adams and Collin 1997;Kumar and Saran 2001, 2003a, b, c, 2004Kumar et al 2004). Various researchers have investigated the behaviour of footings on reinforced homogeneous weak soils and design methods have been developed to determine the ultimate carrying load.…”

Section: Introductionmentioning

confidence: 94%

Bearing capacity tests of strip footings on reinforced layered soil

Kumar

Ohri²,

Bansal

2006

Geotech Geol Eng

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The ultimate bearing capacity of strip footings resting on subsoil consisting of a strong sand layer (reinforced/unreinforced) overlying a low bearing capacity sand deposit has been investigated. Three principal problems were analysed based on results obtained from the model tests as follows: (1) the effect of stratified subsoil on the foundations bearing capacity; (2) the effect of reinforcing the top layer with horizontal layers of geogrid reinforcement on the bearing capacity; (3) effect of reinforcing stratified subsoil (reinforced and unreinforced) on the settlement of the foundation. It has been observed that reinforcing the subsoil after replacing the top layer of soil with a well-graded soil is beneficial as the mobilization of soil-reinforcement frictional resistance will increase.

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Section: Introductionmentioning

confidence: 94%

Bearing capacity tests of strip footings on reinforced layered soil

Kumar

Ohri²,

Bansal

2006

Geotech Geol Eng

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“…On the other hand, mechanism 1, on account of negligence of the shear resistance of the soil mass along the vertical face of the quadrilateral trapped wedge below the footing base, was shown to estimate comparatively lower values of failure load. A number of small-scale model tests have also been performed by different researchers to study the interference effect of the two footings [1,[4][5][6][7]. The available experimental and theoretical investigations invariably reveal that the magnitude of the ultimate bearing pressure, on account of soil density, increases substantially in the presence of the other footing.…”

Section: Introductionmentioning

confidence: 99%

Bearing capacity of two interfering footings

Kumar

Kouzer

2007

Num Anal Meth Geomechanics

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SUMMARYBy using an upper bound limit analysis in conjunction with finite elements and linear programming, the ultimate bearing capacity of two interfering rough strip footings, resting on a cohesionless medium, was computed. Along all the interfaces of the chosen triangular elements, velocity discontinuities were employed. The plastic strains were incorporated using an associated flow rule. For different clear spacing (S) between the two footings, the efficiency factor ( ) was determined, where is defined as the ratio of the failure load for a strip footing of given width in the presence of the other footing to that of a single isolated strip footing having the same width. The value of at S/B = 0 becomes equal to 2.0, and the maximum occurs at S/B = S cr /B. For S/B S cr /B, the ultimate failure load for a footing becomes almost half that of an isolated footing having width (2B + S), and the soil mass below and in between the two footings deforms mainly in the downward direction. In contrast, for S/B>S cr /B, ground heave was noticed along both the sides of the footing. As compared to the available theories, the analysis provides generally lower values of for S/B>S cr /B.

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“…However, many researchers have studied rectangular footings resting on reinforced sand only (Pfeifle and Das 1979;Yetimoglu et al 1994;Kumar and Saran 2003;Abu-Farsakh et al 2013;Sahu et al 2016). strip footings, circular footings, and square footings, very limited work has been done on rectangular footings resting on geosynthetic-reinforced sand layers overlying soft soils.…”

Section: Introductionmentioning

confidence: 99%

Effects of aspect ratio of footings on bearing capacity for geogrid-reinforced sand over soft soil

Roy

Deb

2017

Geosynthetics International

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Model plate load tests of rigid rectangular footings of different aspect ratios resting on sand overlying soft soil with or without a layer of geogrid at the interface are presented. The width (B) and length (L) of the footings are chosen so that the L/B ratio (aspect ratio) is varied as 1.0, 1.5, and 2.0. The study aims to investigate the effects of the aspect ratio of the rectangular footings and the thickness of the sand layer on bearing capacity, settlement characteristics, load-spread angle, and sizes of geogrid layer (at optimum sand thickness). The strain distribution along the reinforcement is also studied. Based on the test results, an analytical method is proposed to calculate the load carrying capacity of rectangular footings resting on reinforced or unreinforced sand over soft soil. It is found that the optimum sand thickness to footing width ratio is not dependent on the aspect ratio of the rectangular footings. However, the optimum sizes of geogrid reinforcement increase with an increase in aspect ratio of the footings. Also, the load-spread angle increases with an increase in aspect ratio. It is also observed that the load-spread angle in the lengthways direction of a footing is smaller than that in the widthways direction, and it is more pronounced in the case of reinforced soil compared to unreinforced soil.

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Closely Spaced Footings on Geogrid-Reinforced Sand

Cited by 101 publications

References 8 publications

Bearing capacity tests of strip footings on reinforced layered soil

Bearing capacity tests of strip footings on reinforced layered soil

Bearing capacity of two interfering footings

Effects of aspect ratio of footings on bearing capacity for geogrid-reinforced sand over soft soil

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