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An experimental investigation for pullout response of granular pile anchors embedded in clayey soil

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Abstract

An efficient and affordable foundation technique to combat pullout forces experienced by transmission towers or foundations in expansive soils is the granular pile-anchor foundation. In the present study, a series of pullout tests on GPAs embedded in clayey soil carried out in the laboratory in order to better understand how GPAs behaved in a clayey soil bed. The pullout tests were carried out in a steel tank measuring 1 m × 1 m × 1 m with the use of a loading frame system. The pullout capacity of the GPAs was determined to be the pullout load required for upward movement equivalent to 10% diameter of GPAs. The diameter was kept constant as 50 mm for all the pullout tests conducted. In the parametric analysis, the number of GPAs, length to diameter ratio, centre to centre spacing and number of anchor plates were taken into consideration. The non-dimensional pullout capacity was considered to further elaborate the results obtained in experimental investigation.

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Abbreviations

C c :

Coefficient of curvature

C u :

Coefficient of uniformity

\({D}_{\rm f}\) :

Diameter of footing

D :

The diameter of granular pile anchor

D r :

Relative density

\(E_{\rm p}\) :

Elastic modulus of pile material

\(E_{\rm s}\) :

Elastic modulus of surrounding soil

\({K}_{\rm s}\) :

Coefficient of lateral swelling pressure

L :

Length of granular pile anchor

n :

Number of GPAs

\({P}_{R}\) :

Resistance to uplift

\({p}_{\rm s}\) :

Swelling pressure

\({P}_{\rm u}\) :

Uplift force, pullout capacity

\(\overline{P}\) :

Non-dimensional pullout capacity

\(R\) :

Relative stiffness

\({S}_{u}\) :

Undrained shear strength

W :

Self-weight of granular pile anchor

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Acknowledgements

The first author wishes to express his gratitude to the Irrigation and Water Resources Department of Uttar Pradesh for kindly sponsoring him to conduct this study, as well as Er. Bhartendu Gaur, Suprintending Engineer for his invaluable assistance.

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Authors and Affiliations

  1. Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Hans Raj Vashishtha & Vishwas A. Sawant

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  1. Hans Raj Vashishtha
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  2. Vishwas A. Sawant
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Correspondence to Vishwas A. Sawant.

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Vashishtha, H.R., Sawant, V.A. An experimental investigation for pullout response of granular pile anchors embedded in clayey soil. Innov. Infrastruct. Solut. 8, 310 (2023). https://doi.org/10.1007/s41062-023-01260-0

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