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This article presents an engineering, empirical method of estimating the bearing capacity and settlement characteristics <italic>Q-s</italic> of screw displacement piles and columns, based on soil resistance encountered during the drilling to form piles/columns in the ground. The method was developed on the basis of correlation analyses of the test results of 24 piles made during the “DPDT-Auger” research project (<xref ref-type="bibr" rid="j_sgem-2023-0014_ref_011">Krasiński et al., 2022a</xref>). In the proposed method, the load capacity of a screw displacement pile is estimated using two main parameters of auger screwing resistance: torque <italic>MT</italic> and the number of auger rotations per depth unit <italic>nR</italic>. The method applies to piles and columns made with a standard <italic>screw displacement pile</italic> (SDP) auger and with the proprietary, prototype DPDT (<italic>displacement pile drilling tool</italic>) aguer, patented in Poland (2020). Based on the estimated ultimate capacities of the pile shaft and base, an approximate method of predicting the pile settlement characteristics <italic>Q-s</italic> was also proposed, using the transfer function method. This article describes a correlation procedure of field test results together with their statistical analysis and presents a method of estimating the pile-bearing capacity based on correlation results. A calculation example is also provided. The conclusion looks at the useful practical applications that could be found for the proposed method.
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This article presents an engineering, empirical method of estimating the bearing capacity and settlement characteristics Q-s of screw displacement piles and columns, based on soil resistance encountered during the drilling to form piles/columns in the ground. The method was developed on the basis of correlation analyses of the test results of 24 piles made during the “DPDT-Auger” research project (Krasiński et al., 2022a). In the proposed method, the load capacity of a screw displacement pile is estimated using two main parameters of auger screwing resistance: torque MT and the number of auger rotations per depth unit nR. The method applies to piles and columns made with a standard screw displacement pile (SDP) auger and with the proprietary, prototype DPDT (displacement pile drilling tool) aguer, patented in Poland (2020). Based on the estimated ultimate capacities of the pile shaft and base, an approximate method of predicting the pile settlement characteristics Q-s was also proposed, using the transfer function method. This article describes a correlation procedure of field test results together with their statistical analysis and presents a method of estimating the pile-bearing capacity based on correlation results. A calculation example is also provided. The conclusion looks at the useful practical applications that could be found for the proposed method.

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

Faculty of Civil and Environmental Engineering

Studia Geotechnica et Mechanica

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

This article presents an engineering, empirical method of estimating the bearing capacity and settlement characteristics Q-s of screw displacement piles and...

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

Article Category: Special Issue 19th KKMGiIG

Published Online: Sep 30, 2023

Page range: 282 - 292

Received: Jan 15, 2023

Accepted: Jun 23, 2023

DOI: https://doi.org/10.2478/sgem-2023-0014

Keywords
screw displacement pile, pile load capacity, pile auger, soil resistance during pile formation

© 2023 Adam Krasiński, published by Sciendo

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

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

Article Category: Special Issue 19th KKMGiIG

Published Online: Sep 30, 2023

Page range: 282 - 292

Received: Jan 15, 2023

Accepted: Jun 23, 2023

DOI: https://doi.org/10.2478/sgem-2023-0014

Keywordsscrew displacement pile, pile load capacity, pile auger, soil resistance during pile formation

© 2023 Adam Krasiński, published by Sciendo

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

Keywords
screw displacement pile, pile load capacity, pile auger, soil resistance during pile formation