Evaluating soil setup after open metallic pile driving
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Full Text |
Pdf
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Author |
Jamila El Brahmi, Othmane Hniad and Imane El Kasimi
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e-ISSN |
1819-6608 |
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On Pages
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2474-2484
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Volume No. |
18
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Issue No. |
22
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Issue Date |
January 30, 2024
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DOI |
https://doi.org/10.59018/1123298
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Keywords |
soil setup, open steel piles, re-driving resistance, PDA, CAPWAP.
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Abstract
After driving a pile, foundation soil is restructured and thus regains part of its resistance. This phenomenon is
aptly named soil setup. This paper’s focus is to study said phenomenon on eight open metal piles driven in a soil composed
of sand and marl, while basing our findings on data of dynamic PDA tests processed with CAPWAP software. Firstly,
dynamic tests performed after driving phase and at subsequent re-driving phases show an increase in both the required
number of blows for a 10-centimeter drive and in the static resistance to re-driving. The correlations of these resistances
with the predictions of the models of Skov & Denver (1988) and Svinkin & Skov (2000) were not satisfactory (R2 of 0.77
and 0.75 respectively). Noting that the setup is mainly due to the increase in friction, a layer-by-layer analysis is carried out
by treating the sand and the marl separately. Attained results fit well the Skov & Denver model and align with the
experimental results of Murad (2014), but given the model’s limitations in terms of reference time determination, we
develop a new function model potency considering immediate setup. The new model fits our attained results very well (R2
of 0.944 for sand and 0.980 for marl). The final static strength after setup is thus calculated as a function of time based on
the power function model and conservative estimates. This approach encourages allowing time for the soil to gradually and
naturally scar instead of rushing into immediate and costly measures such as patching.
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