Аннотации:
Drilled Displacement System (DDS) and Continuous Flight
Auger (CFA) piles are two popular techniques used for building pile
foundations that offer advantages over traditional pile systems, including
improved load-carrying capacity, reduced installation time, and less spoil
generation. This article presents laboratory-scaled model tests conducted
on model piles installed using the Drilled Displacement System (DDS) and
Continuous Flight Auger (CFA) technologies on a test tank setup filled
with soil. Model piles considering a scaling factor of 1/20 with a diameter
of 20 mm and a length of 300 mm were adopted for the study. Static
loading is applied to the model piles and the corresponding displacements
are measured during each loading phase. The results of the analysis were
compared for load-settlement curves and ultimate bearing capacity
estimates for both DDS and CFA piles. Based on the study, the DDS piles
were observed to perform well in terms of load-carrying capacity
compared to the CFA piles. Further, full-scale field tests under static load
conditions were carried out on DDS-drilled piles of diameter 400 mm and
length 6 m. The load-settlement response from the field test shows good
agreement with the model tests. Overall, the results of the study provide
valuable insights into the behavior and performance of DDS piles that can
be used to optimize their design and installation in different soil types.
