Page 302 - Analysis and Design of Energy Geostructures

278 Analysis and Design of Energy Geostructures

Figure 6.5 Evolution of thermally induced strains in an energy pile upon a heating passive cool-
ing cycle at depths of z 5 6:5m (z=L 5 0:25) and z 5 24:5m (z=L 5 0:95). Redrawn after Laloui, L.,
Moreni, M., Vulliet, L., 2003a. Comportement d'un pieu bi-fonction, fondation et échangeur de chaleur.
Can. Geotech. J. 40 (2), 388 402.

Figure 6.6 Evolution of thermally induced radial strain in an energy pile throughout a heating passive
cooling cycle. Redrawn after Laloui, L., Nuth, M., Vulliet, L., 2006 Experimental and numerical investiga-
tions of the behaviour of a heat exchanger pile. Int. J. Numer. Anal. Methods Geomech. 30 (8), 763 781.
energy pile free to move vertically at its head with reference to the results presented
by Laloui et al. (2006). In this example, the strains do not completely recover at the
end of the heating passive cooling cycle because the initial and final temperature
values characterising the energy pile are different.