Thermo-mechanical behaviour of clay-structure interface

Soheib Maghsoodi (1, 2) , Olivier Cuisinier (1) , Farimah Masrouri (1)

1 LEMTA - Laboratoire d'Energétique et Mécanique Théorique et Appliquée
2 ESITC Metz - École supérieure d'ingénieurs des travaux de la construction de Metz

The mechanical behaviour of the soil-structure interface plays a major role in the shear characteristics and bearing capacity of foundations. In thermo-active structures, due to non-isothermal conditions, the interface behaviour becomes more complex. The objective of this study is to investigate the effects of temperature variations on the mechanical behaviour of soils and soil-structure interface. Constant normal load (CNL) and constant normal stiffness (CNS) tests were performed on soil and soil-structure interface in a direct shear device at temperatures of 5, 22 and 60 o C. Kaolin clay was used as proxy for clayey soils. The results showed that, in clay samples the temperature increase, increased the cohesion and consequently the shear strength, due to thermal contraction during heating. The temperature rise had less impact on the shear strength in the case of the clay-structure interface than in the clay samples. The adhesion of the clay-structure interface, is less than the cohesion of the clay samples.

Domaines: Génie civil; Géotechnique

Soheib Maghsoodi, Olivier Cuisinier, Farimah Masrouri. Thermo-mechanical behaviour of clay-structure interface. E3S Web of Conferences, 2019, 7th International Symposium on Deformation Characteristics of Geomaterials (IS-Glasgow 2019), 92, pp.10002. ⟨10.1051/e3sconf/20199210002⟩. ⟨hal-02439428⟩