Page 265 - Analysis and Design of Energy Geostructures

240 Analysis and Design of Energy Geostructures

Figure 5.25 Effect of temperature on the oedometric modulus of fine-grained soils. Redrawn after
Di Donna, A., Laloui, L., 2015. Response of soil subjected to thermal cyclic loading: experimental and
constitutive study. Eng. Geol. 190 (1), 65 76.

conditions for both coarse- and fine-grained soils (Hueckel and Baldi, 1990; Hueckel
and Pellegrini, 1992; Burghignoli et al., 2000; Graham et al., 2001; Cekerevac and
Laloui, 2004; Robinet et al., 1997; Ghahremannejad, 2003; Yavari et al., 2016;
Murphy and McCartney, 2014). Based on the previous results, an actual variation of
the angle of shear strength under constant volume conditions with temperature can
be observed in some cases. Experimental investigations have shown a slight depen-
dency of the angle of shear strength for kaolin (Cekerevac and Laloui, 2004) and nat-
ural Boom clay (Hueckel and Pellegrini, 1989), whereas an insensitivity of the
considered parameter for Illite (Graham et al., 2001) and smectite clay (Burghignoli
et al., 2000; Hueckel and Baldi, 1990). However, potential variations of the angle of
shear strength under constant volume conditions with temperature typically appear to
be small and negligible from a practical perspective. The previous consideration agrees
with the conclusions of Yavari et al. (2016). Supporting experimental evidence is
reported in Fig. 5.26. Additional considerations can be found in Hueckel et al. (2009)
and Hueckel et al. (2011). Based on the previous arguments, the angle of shear
strength of soils can be considered independent of temperature. This fact is particu-
larly relevant for the estimation of the capacity of energy geostructures, whose gov-
erning mathematical formulations depend in most cases on this parameter.