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Estimation of Screw Displacement Pile-Bearing Capacity Based on Drilling Resistances

Adam Krasiński

Adam Krasiński

Faculty of Civil and Environmental Engineering, Gdansk University of TechnologyGdansk, Poland
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Krasiński, Adam
  
30. Sept. 2023
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Artikel-Kategorie: Special Issue 19th KKMGiIG
Online veröffentlicht: 30. Sept. 2023
Seitenbereich: 282 - 292
Eingereicht: 15. Jan. 2023
Akzeptiert: 23. Juni 2023
DOI: https://doi.org/10.2478/sgem-2023-0014
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© 2023 Adam Krasiński, published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1:

Correlations between summed drilling effort SumIE and ultimate bearing capacity of pile shaft (a) and of total pile (b), obtained by NeSmith (2003).
Correlations between summed drilling effort SumIE and ultimate bearing capacity of pile shaft (a) and of total pile (b), obtained by NeSmith (2003).

Figure 2:

Selected graphs from the performance record of an example screw displacement pile.
Selected graphs from the performance record of an example screw displacement pile.

Figure 3:

Scheme of prototype DPDT drill auger according to Patent No. PL 235442 B1, [24].
Scheme of prototype DPDT drill auger according to Patent No. PL 235442 B1, [24].

Figure 4:

Displacement augers tested in the research project: a) DPDT b) DPDT-S, c) SDP
Displacement augers tested in the research project: a) DPDT b) DPDT-S, c) SDP

Figure 5:

Auger and its simplified schematic representation (right) in the form of a cylinder (Krasiński, 2014).
Auger and its simplified schematic representation (right) in the form of a cylinder (Krasiński, 2014).

Figure 6:

Diagrams of screwing parameters MT and nR as well as calculation of WT;s and WT;b, for example, pile No. 600.
Diagrams of screwing parameters MT and nR as well as calculation of WT;s and WT;b, for example, pile No. 600.

Figure 7:

Example result of instrumented pile load test with specified limit load capacities of shaft Qs;ult and base Qb;ult (b) together with soil profile and cone resistance diagram (a).
Example result of instrumented pile load test with specified limit load capacities of shaft Qs;ult and base Qb;ult (b) together with soil profile and cone resistance diagram (a).

Figure 8:

Relationships between representative auger screwing resistances and normalized limit resistances of piles, obtained from the tests, approximated by trend lines: a) for pile shaft, b) for pile base.
Relationships between representative auger screwing resistances and normalized limit resistances of piles, obtained from the tests, approximated by trend lines: a) for pile shaft, b) for pile base.

Figure 9:

Derived relationships between pile load limit resistances Qs;ult (a) and Qb;ult (b) and representative screwing resistances WT;s (a) and WT;b (b) separately for SDP and DPDT drill augers.
Derived relationships between pile load limit resistances Qs;ult (a) and Qb;ult (b) and representative screwing resistances WT;s (a) and WT;b (b) separately for SDP and DPDT drill augers.

Figure 10:

Q-s characteristics of the SDP pile No. 600, estimated on the basis of the auger screwing resistance compared with result of the real test.
Q-s characteristics of the SDP pile No. 600, estimated on the basis of the auger screwing resistance compared with result of the real test.
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