Field tests of spiral energy piles under the combined effect of temperature
and loading are relatively few. Based on the field test, the heat transfer
efficiency, pile strain, axial force and shaft friction of two spiral energy
piles were studied. The major findings of the experimental studies were as
follows: First, when the double spiral energy pile was heated, the
temperature distribution was more uniform; the total heat transfer and the
heat transfer rate were higher than those of the single spiral energy pile.
Second, the pile strain distribution was such that smaller values were
noticed at both pile ends while larger values were in the middle part of the
pile. The additional tensile stresses of the two piles generated during
cooling reached 4.06 MPa and 4.75 MPa, which exceeded the tensile strength
of concrete. Finally, during heating, the shaft friction was negative in the
middle and upper pile and positive in the middle and lower pile. The single
spiral energy pile showed two neutral points. The downward load generated by
the single spiral energy pile was about 885 kN higher than that generated by
the double one. The above changes should be focused on in the actual
project.
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