Behaviour of the pile–soil interface is important to correctly predict the response of floating piles in terms of displacement and lateral friction. Regarding energy piles, which couple the structural roles of deep foundations with the principle of shallow geothermal energy, the response of pile–soil interfaces is influenced by seasonal and daily cyclic thermal variations. Accordingly, the goal of this paper is to experimentally investigate the response of the pile–soil interface at different temperatures. This experimental campaign aims to analyse (i) the cyclic mobilization of the shear strength of the soil–pile interface that is induced by thermal deformation of the pile and (ii) the direct influence of temperature variations on the soil and soil–pile interface behaviour. In this study, a direct shear device was developed and calibrated for nonisothermal soil–structure interface testing. It appears that the sand–concrete interface was affected by cyclic degradation but not affected directly by temperature. Conversely, the response of the clay–concrete interface changed at different temperatures, showing an increase of strength with increasing temperature, presumably due to the effects of temperature on clay deformation.

Di Donna, A., Ferrari, A., Laloui, L. (2016). Experimental investigations of the soil-concrete interface: Physical mechanisms, cyclic mobilization, and behaviour at different temperatures. CANADIAN GEOTECHNICAL JOURNAL, 53(4), 659-672 [10.1139/cgj-2015-0294].

Experimental investigations of the soil-concrete interface: Physical mechanisms, cyclic mobilization, and behaviour at different temperatures

Ferrari, Alessio
;
2016-01-01

Abstract

Behaviour of the pile–soil interface is important to correctly predict the response of floating piles in terms of displacement and lateral friction. Regarding energy piles, which couple the structural roles of deep foundations with the principle of shallow geothermal energy, the response of pile–soil interfaces is influenced by seasonal and daily cyclic thermal variations. Accordingly, the goal of this paper is to experimentally investigate the response of the pile–soil interface at different temperatures. This experimental campaign aims to analyse (i) the cyclic mobilization of the shear strength of the soil–pile interface that is induced by thermal deformation of the pile and (ii) the direct influence of temperature variations on the soil and soil–pile interface behaviour. In this study, a direct shear device was developed and calibrated for nonisothermal soil–structure interface testing. It appears that the sand–concrete interface was affected by cyclic degradation but not affected directly by temperature. Conversely, the response of the clay–concrete interface changed at different temperatures, showing an increase of strength with increasing temperature, presumably due to the effects of temperature on clay deformation.
2016
Settore ICAR/07 - Geotecnica
Di Donna, A., Ferrari, A., Laloui, L. (2016). Experimental investigations of the soil-concrete interface: Physical mechanisms, cyclic mobilization, and behaviour at different temperatures. CANADIAN GEOTECHNICAL JOURNAL, 53(4), 659-672 [10.1139/cgj-2015-0294].
File in questo prodotto:
File Dimensione Formato  
2016_DiDonna_et_al_Experimental investigation of the soil concrete inter....pdf

Solo gestori archvio

Dimensione 4.17 MB
Formato Adobe PDF
4.17 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/263307
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 167
  • ???jsp.display-item.citation.isi??? 138
social impact