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Parametric study of under-reamed piled ring foundation in soft clay

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Abstract

A numerical analysis of the under-reamed piled ring foundation was performed to comprehend the effect of randomly distributed fibre-reinforced sand (RDFS cushion) overlying the soft clay and the influence of providing the under-reams on the pile stem. The study has been carried out with respect to load sharing ratio, differential settlement, load improvement factor (QIF) and settlement reduction ratio (SRR). Analysis of the results indicated that for the piled ring foundation, QIF and load sharing ratio increases, and differential settlement decreases with an increase in the number of under-reams on the pile stem and a decrease in the spacing between piles. Whereas, RDFS cushion underneath the ring foundation in the under-reamed piled ring foundation further increases QIF and decreases differential settlement and changes the behaviour of the under-reamed piled ring foundation towards the circular piled ring foundation. The differential settlement was reduced more for the pile arrangement patterns that had some piles near the ring foundation’s inner edge than that of the pile arrangement patterns with piles along the centerline of the ring foundation.

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Abbreviations

RDFSC:

Randomly distributed fibre reinforced sand cushion

QIF :

Load improvement factor

SRR :

Settlement reduction ration

PRF:

Piled ring foundation

UPRF:

Under-reamed piled ring foundation

L:

Length of pile

D:

Diameter of the pile

Du :

Diamter of the under-ream

Di :

Inner diameter of the ring foundation

Do :

Outer diameter of the ring foundation

H:

Thickness of the RDFSC

b:

Width of the ring foundation strip

d:

Depth of the first under-ream from the base of the ring foundation

Spc :

Center to the center spacing between piles provided at the ring foundation’s the centerline

Spi :

Center to the center spacing between piles provided near the ring foundation’s inner edge

Spo :

Center to the center spacing between piles provided near the ring foundation’s the outer edge

Spio :

Center to center spacing between piles provided near the ring foundation’s inner and outer edge

Spic :

Center to center spacing between piles provided near the ring foundation’s inner edge and at the center

Spoc :

Center to center spacing between piles provided near the ring foundation’s outer edge and at the center

N:

Number of piles

u:

Upheaval of soil from the opening of the ring foundation

s:

Settlement of the ring foundation/PRF/UPRF

θ:

Angle of distortion

GPRF :

Load sharing ratio

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Authors and Affiliations

  1. Department of Civil Engineering, National Institute of Technology, Jalandhar, 144011, India

    Prince Karandeep Singh & Arvind Kumar

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  1. Prince Karandeep Singh
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  2. Arvind Kumar
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Correspondence to Prince Karandeep Singh.

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Singh, P.K., Kumar, A. Parametric study of under-reamed piled ring foundation in soft clay. Sādhanā 49, 147 (2024). https://doi.org/10.1007/s12046-024-02510-2

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