<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Occurrence of the so-called residual force of an unknown value significantly disturbs interpretation of static load tests performed on piles equipped with additional measuring instruments. Screw displacement piles are the piling technology in which the residual force phenomenon is very common. Its formation mechanism is closely related to the installation method of this type of piles, which initiates generation of negative pile skin friction without any additional external factors. Knowledge of the value and distribution of a residual force (trapped in a pile shaft before starting the load test) is a necessary condition for the proper interpretation of instrumented pile test results.</p>
<p>In this article, a clear and easy-to-use method of residual force identification, based on the analysis of shaft deformations recorded during pile unloading is presented. The method was successfully verified on two pile examples and proved to be effective and practical.</p>
</abstract>

Occurrence of the so-called residual force of an unknown value significantly disturbs interpretation of static load tests performed on piles equipped with additional measuring instruments. Screw displacement piles are the piling technology in which the residual force phenomenon is very common. Its formation mechanism is closely related to the installation method of this type of piles, which initiates generation of negative pile skin friction without any additional external factors. Knowledge of the value and distribution of a residual force (trapped in a pile shaft before starting the load test) is a necessary condition for the proper interpretation of instrumented pile test results.
In this article, a clear and easy-to-use method of residual force identification, based on the analysis of shaft deformations recorded during pile unloading is presented. The method was successfully verified on two pile examples and proved to be effective and practical.

Identification of residual force in static load tests on instrumented screw displacement piles

Faculty of Civil and Environmental Engineering

Studia Geotechnica et Mechanica

This work is licensed under the Creative Commons Attribution 4.0 International License.

Occurrence of the so-called residual force of an unknown value significantly disturbs interpretation of static load tests performed on piles equipped with...

Identification of residual force in static load tests on instrumented screw displacement piles

Article Category: Original Study

Published Online: Dec 13, 2021

Page range: 438 - 451

Received: May 29, 2021

Accepted: Sep 07, 2021

DOI: https://doi.org/10.2478/sgem-2021-0025

Keywords
residual force, pile load test, pile instrumentation, load distribution, displacement pile

© 2021 Adam Krasiński et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Identification of residual force in static load tests on instrumented screw displacement piles

Article Category: Original Study

Published Online: Dec 13, 2021

Page range: 438 - 451

Received: May 29, 2021

Accepted: Sep 07, 2021

DOI: https://doi.org/10.2478/sgem-2021-0025

Keywordsresidual force, pile load test, pile instrumentation, load distribution, displacement pile

© 2021 Adam Krasiński et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
residual force, pile load test, pile instrumentation, load distribution, displacement pile