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Bearing capacity of skirted ring footing on soft clay overlying dense sand

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Abstract

This study uses finite element analysis to determine the ultimate bearing capacity of unskirted/skirted ring footing under concentric, vertical loads. The clay cohesion and thickness ratio ranged from 8 to 26 kPa and 0.25 to 1.5, respectively. At the same time, the friction angle of the dense sand layer was kept between 40° and 44°. The circular footing had the largest bearing capacity, followed by ring footings with the double skirt, inner skirt, no skirt, and outer skirt, with a thickness ratio of 0.25. The ring footing with a double skirt had the maximum bearing capacity at a thickness ratio of 0.5, followed by a circular, ring without a skirt, a ring with an inner skirt, and a ring with an outer skirt. At a thickness ratio of 1.5, the unskirted circular and ring footings have the equivalent bearing capacity, while ring footing with the outer skirt has a greater bearing capacity than footing with an inner skirt. Furthermore, the double-skirted ring footing had the lowest bearing capacity at this thickness ratio. The generated displacement contours complemented computational findings. The provision of inner and double skirts significantly reduced soil heave via the ring annulus compared to the outer skirt alone.

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Abbreviations

D :

Outer diameter of footing

U :

Thickness of the upper soft clay layer

S :

Settlement of footing

s/D :

Normalised settlement

γ 1 :

Unit weight of upper soft clay layer

γ 2 :

Unit weight of the lower dense sand layer

c 1 :

Cohesion of upper soft clay layer in kPa

ϕ 2 :

Friction angle of the lower dense sand layer

µ 1 :

Poisson ratio of the upper soft clay layer

µ 2 :

Poisson ratio of the lower dense sand layer

E 1 :

Modulus of elasticity of upper soft clay layer

E 2 :

Modulus of elasticity of lower dense sand layer

Ψ2 :

Dilation angle of the lower dense sand layer

U/D :

Thickness ratio

q u :

Ultimate bearing capacity in kPa

δ :

Surface heaving

δ/D :

Normalised surface heaving

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Authors and Affiliations

  1. National Institute of Technology, Hamirpur, Himachal Pradesh, 177005, India

    Rakesh Kumar Dutta

  2. Indian Institute of Technology, Dhanbad, Jharkhand, India

    Vishwas Nandkishor Khatri

  3. Department of Civil Engineering, National Institute of Technology, Hamirpur, India

    Duha Nissar Hamdani

Authors
  1. Rakesh Kumar Dutta
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  2. Vishwas Nandkishor Khatri
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  3. Duha Nissar Hamdani
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Correspondence to Vishwas Nandkishor Khatri.

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Dutta, R.K., Khatri, V.N. & Hamdani, D.N. Bearing capacity of skirted ring footing on soft clay overlying dense sand. Innov. Infrastruct. Solut. 7, 319 (2022). https://doi.org/10.1007/s41062-022-00923-8

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