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Studia Geotechnica et Mechanica
Volume 43 (2021): Issue 4 (December 2021)
Open Access
Identification of residual force in static load tests on instrumented screw displacement piles
Adam Krasiński
Adam Krasiński
and
Mateusz Wiszniewski
Mateusz Wiszniewski
| Dec 13, 2021
Studia Geotechnica et Mechanica
Volume 43 (2021): Issue 4 (December 2021)
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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.
Figure 1
The stress–strain relation measured in the first section of the pile (pile no. 6293): a) general for loading and unloading, b) only for loading, described by a function.
Figure 2
Axial load distribution along the pile shaft (pile no. 6293)
Figure 3
The mechanism of residual force generation in a screw displacement pile: a) phase of soil spreading by the auger, b) phase after the pile is completed and the concrete has hardened.
Figure 4
An example of test result with the presence of initial compressive (residual) force in the pile shaft found due to shaft elongation after unloading (pile no. 6293).
Figure 5
The stress–strain relation in the first measuring section of the pile shaft, determined for the unloading phase and described by function (for the same example as in Fig. 1, pile no. 6293).
Figure 6
Pile no. 6293, CPTu sounding and the basic result of the load test
Figure 7
Pile no. 6293, interpretation of qs and qb unit soil resistances around the pile, based on the data from Figs 2 and 6, without taking into account the influence of the residual force.
Figure 8
Pile no. 6293: (a) determination of the residual force in the pile shaft and (b) its inclusion in the distribution of the axial force along the pile in successive load steps.
Figure 9
Pile no. 6293, interpretation of qs and qb unit soil resistances around the pile after taking the residual force into account.
Figure 10
Pile no. 6293, comparison of qs and qb unit soil resistances around the pile for the cases: a) without taking into account the residual force and b) taking into account the residual force
Figure 11
Pile no. 9, basic result of the load test.
Figure 12
Pile no. 9, graphs of the pile shaft deformation in individual measuring sections and in subsequent stages of pile loading and unloading.
Figure 13
Stress–strain relation in the pile shaft determined in the first measuring section: a) general for load and unload; b) for load 1, described by a function and c) for unload 1, described by a function.
Figure 14
Pile no. 9. Axial load distribution along the pile shaft without taking into account the influence of the residual force.
Figure 15
Pile no. 9, interpretation of qs and qb unit soil resistances around the pile without taking into account the influence of the residual force.
Figure 16
Pile no. 9, determination of the residual force in the pile shaft (a) after first unloading (b) after second unloading and (c) its inclusion in the distribution of the axial force along the pile in successive load steps.
Figure 17
Pile no. 9, interpretation of qs and qb unit soil resistances around the pile after taking the residual force into account.
Figure 18
Pile no. 9, comparison of qs and qb unit soil resistances around the pile for the cases: a) without taking into account the residual force and b) taking into account the residual force.
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