Behavior of 2×2 Pile Groups with Varied Number of Energy Piles in Dry Silty Soil
Behavior of 2×2 Pile Groups with Varied Number of Energy Piles in Dry Silty Soil
ABSTRACT: Thermo-Mechanical behaviour of 2×2 pile groups under asymmetrical thermal loading was investigated through 1g physical modelling. Three tests were carried out, each involving 1, 2, and 3 energy piles within the group, subjected to cyclic asymmetrical thermal loading. The model utilized closed-end aluminium pipes for the piles and fine-grained dry silty sand for the ground, compacted using dry tamping in a container. Over 10 heating-cooling cycles with a ±6°C amplitude were applied to the energy piles. Pile-head displacements, rotations of the cap, axial forces, bending moments along the piles, soil pressure changes beneath the pile tip, and temperature distribution around the group were monitored. A novel parameter, the "pile tip behaviour index" ( ), was introduced to assess the soil's elastic/plastic state beneath the pile tip during each test. Findings indicate the formation of plastic zones in the soil beneath the energy pile during initial thermal cycles, potentially leading to excessive cap rotations.
Fardin Jafarzadeh; S. Afzalsoltani
4th Asia-Pacific Conference on Physical Modelling in Geotechnics (ACPMG2024)
Other
https://doi.org/10.53243/ACPMG2024-22
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