Bearing capacity of ring footing on weak sand layer overlying a dense sand deposit

Das, Pragyan Paramita; Khatri, Vishwas N.; Dutta, Rakesh Kumar

doi:10.1080/17486025.2019.1664775

Cited by 19 publications

(9 citation statements)

References 34 publications

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“…This kind of foundation is well known as ring foundations, which is widely used to support axisymmetric structures such as transmission towers, silos, water towers, storage tanks, and chimneys. All previous studies regarding the bearing capacity of the ring foundations have been concerned about many kinds of soils using the MC yield criterion [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. A more complicated issue, which is the bearing capacity of ring foundations on HB rock masses, has never been considered in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…Note that the previous bearing capacity solutions are limited to the cases of circular foundations on rock masses (e.g., [11][12][13][14][15]). Note that there were only the works providing the bearing capacity solutions for either circular foundations on rock masses [11][12][13][14][15] or ring foundation on soils [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] in the past. In this study, the ring foundation has an internal radius r i and an external radius r o , and is subjected to the vertical uniform load q.…”

Section: Introductionmentioning

confidence: 99%

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Limit Analysis Solutions for Bearing Capacity of Ring Foundations on Rocks Using Hoek–Brown Failure Criterion

Yodsomjai

Keawsawasvong

Lai

2021

Int. J. of Geosynth. and Ground Eng.

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In this paper, new limit analysis solutions for the bearing capacity of ring foundations on rock masses are presented, where the Hoek-Brown yield criterion is used as a failure criterion for rock masses. The lower and upper bound finite element limit analysis is employed to derive the bearing capacity solutions of ring foundations on rock masses. The ring foundation has internal and external radii. The considered dimensionless parameters include the ratio between the internal radius and the external radius, the yield parameter, and the geological strength index of rock, where the effects of these dimensionless parameters on the bearing capacity factor are investigated. It is found that a high yield parameter or a high geological strength index yields a high value of the bearing capacity factor. When the ratio between the internal radius and the external radius is around 0.25, the bearing capacity factor becomes the largest. The collapse mechanisms of this problem are also examined and discussed in the present study.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Limit Analysis Solutions for Bearing Capacity of Ring Foundations on Rocks Using Hoek–Brown Failure Criterion

Yodsomjai

Keawsawasvong

Lai

2021

Int. J. of Geosynth. and Ground Eng.

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“…The bearing capacity of shallow foundations on layered sand strata has been extensively explored by various researchers. [21] conducted a numerical investigation on the ultimate bearing capacity of a ring footing on loose sand overlying a dense sand deposit. [22] developed a theory for the ultimate bearing capacity of footings on subsoil with a strong sand layer overlying a weak sand deposit.…”

Section: Introductionmentioning

confidence: 99%

BEARING CAPACITY ESTIMATION OF STRIP FOOTING ON TWO-LAYERED c-ϕ SOILS BASED ON THE RIGID PLASTIC FINITE ELEMENT METHOD

Tamboura

2024

GEOMATE

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This study investigates the bearing capacity of a strip footing on two-layered c-ϕ soils by considering layer factors estimated using an in-house FEM code, namely, the rigid-plastic finite element method. The influences of the following ratios on the bearing capacity factors were investigated: the ratio of the tangent of the angle of friction of the bottom layer to that of the top layer; the ratio of the cohesion of the bottom layer to that of the top layer; the ratio of the unit weight of the bottom layer to that of the top layer; and the ratios of the embedment of the footing and the thickness of the top layer to the footing width. Based on the influences of those ratios, layer factors are determined. Several types of failure mechanics were found and the conditions of occurrence of each failure type are summarized in a chart. In addition, a new approach for estimating the bearing capacity of a strip footing on two-layered c-ϕ soils is proposed. A comparison with available methods in the literature has confirmed the reliability of the proposed method, showing the application limitation of the past research.

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“…Moreover, the implementing of the ring footing is another option that adopted by some experts in geotechnical field to overcome the soil weakness. Several researchers such as [5,7,8,13,16,17] were studied the bearing-capacity of ring foundation constructed in different type of soils. Hataf and Baziar [11] noticed an increase, after using a square foundation in the bearing -capacities of the reinforced soils and then obtained the optimum values of (u/B) and (z/B) where the u and z represent the firstlayer depth and the vertical spacing between reinforced-layers, respectively.…”

Section: Introductionmentioning

confidence: 99%

Evaluation bearing capacity of ring footings on reinforced loose sand

Fartosy¹,

Jawad²,

Hacheem³

et al. 2023

J Appl Eng Science

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Ring footing represents a significant structural member in different applications such as fuel or water storage tanks in addition to other structures. The advantage of this type of footing is related to the ability to reduce the weakness of some soils that may affect the safety of structures. An experimental testing program was conducted by using a small-scale model in the laboratory of the college of engineering at the university of Al-Mustansiriyah which consists of twelve ring footing models resting on loose sand reinforced by geogrid layers. The parameters that studied in this research are the diameter of ring footing, thickness of ring, the position placed of one reinforced layer and vertical spacing between two reinforced layers. The findings of this research shown that the optimum percentage of diameter ratio of ring footing is (0.25) and when the depth-ratio increases, the bearing-capacity of ring footing begin decreases. In general, the increase in ring thickness causes the bearing-capacity and the rigidity of ring foundation to increase. The optimum of the depth-ratio of the first reinforced layer is (0.25) and the optimum value of vertical-spacing bounded by layers is around (0.25) which produces a maximum value of the bearing-capacity. Its noticed that when these percentages exceeded value 0.25, the bearing-capacity of the ring foundation drops eventually.

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Bearing capacity of ring footing on weak sand layer overlying a dense sand deposit

Cited by 19 publications

References 34 publications

Limit Analysis Solutions for Bearing Capacity of Ring Foundations on Rocks Using Hoek–Brown Failure Criterion

Limit Analysis Solutions for Bearing Capacity of Ring Foundations on Rocks Using Hoek–Brown Failure Criterion

BEARING CAPACITY ESTIMATION OF STRIP FOOTING ON TWO-LAYERED c-ϕ SOILS BASED ON THE RIGID PLASTIC FINITE ELEMENT METHOD

Evaluation bearing capacity of ring footings on reinforced loose sand

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