Preliminary study on the mechanical behaviour of heat exchanger pile in physical model

Argyro Kalantidou (1) , Anh Minh A.M. Tang (2) , Jean-Michel Pereira (2) , Ghazi Hassen (3)

1 navier umr 8205 - Laboratoire Navier
2 cermes - Géotechnique
3 multi-échelle - Modélisation et expérimentation multi-échelle pour les solides hétérogènes

The effects of temperature changes on the mechanical behaviour of heat exchanger piles are necessary to be taken into account in geotechnical design. In this preliminary study, the behaviour of an axially loaded pile under thermal cycles was investigated using a physical model. After applying the axial load by dead weights on the pile's head, the pile was heated from 25 °C to 50 °C and subsequently cooled to 25 °C. Four tests (corresponding to four values of axial load) were performed and two temperature cycles were undertaken in each test. The pile's temperature and the pile head displacement were monitored. When low axial loads were applied, the heating induced heave and cooling induced settlement of the pile's head. In this case, the displacement-temperature curve was found to be reversible and similar to the thermal expansion curve of the pile. However, in the case of higher axial loads, the heave of the pile's head, obtained during heating, was lower than the thermal expansion of the pile demonstrating the settlement of the pile's toe. Reversible settlement of the pile's head was also observed after these thermal cycles.

Mots clés: Model tests; heat exchanger pile; settlement; soil/structure interaction; temperature effects

Domaines: Autre

Argyro Kalantidou, Anh Minh A.M. Tang, Jean-Michel Pereira, Ghazi Hassen. Preliminary study on the mechanical behaviour of heat exchanger pile in physical model. Geotechnique, 2012, 62 (11), pp.1047-1051. ⟨10.1680/geot.11.T.013⟩. ⟨hal-00772584⟩