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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).
Figure 2:
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].
Figure 4:
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).
Figure 6:
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).
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.
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.
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.