Comparison of bearing capacities of model drilled micro piles using DDS and CFA technologies
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DOI:
https://doi.org/10.32523/2616-7263-2023-145-4-165-174Keywords:
scaled model tests, model piles, bearing capacity, static load testAbstract
Drilled piles installed using CFA (Continuous Flight Auger) and DDS (Drilled
displacement system) technologies are relatively new construction products in the market of
Kazakhstan for the last 15 years, but already today the technology has a significant practical
value in the construction of the cities of Astana, Almaty and other regions. This article presents
model tests of bored piles installed using Drilled Displacement System (DDS) and Continuous
Flight Auger (CFA) technologies on a volumetric bench. For testing we used 1:20 scale, piles
diameter was 20 mm, length was 300 mm. Drilling was performed using augers that were
prepared in advance through a 3D printer. The load on the model piles was applied in steps of
39 N up to the ultimate load of 391 N. Based on the results of the study, the «settlement-load»
plots of the DDS and CFA model piles were obtained, as well as a comparison of the bearing
capacity of these piles by static test method. Based on the study, it was found that the DDS piles
exhibit good bearing capacity performance compared to the CFA piles. Overall, the results of the
study provide valuable information on the performance behavior of DDS and CFA piles, which
can be used to optimize their design and installation in different soil types.
