scholarly journals Thermally induced pore water pressure of reconstituted London clay

2019 ◽  
Vol 92 ◽  
pp. 10003
Author(s):  
Sihua Chen ◽  
Lidija Zdravkovic ◽  
J. Antonio H. Carraro

Different forms of thermo-active structures have been proposed as a way of making use of the ground temperature to achieve renewable low-carbon heating and cooling in civil engineering construction. Such structures comprise piles, retaining walls or tunnel linings, and are used both as structural components and as conduits for utilising geothermal energy. In the scenario of the underground space in London, it is the thermo-active piles that have received most attention. However, little experimental evidence exists on the thermal behaviour of London clay to aid the design of thermo-active structures. This paper presents advanced laboratory testing on the reconstituted London clay to characterise the effect of temperature on its mechanical behaviour. Particular emphasis is given to thermally induced pore water pressures, as their evolution is not well understood. Tests are conducted in a temperature-controlled isotropic cell developed at Imperial College London. The emphasis of the current paper is on the temperature-based calibrations of different transducers. Soil specimens are isotropically consolidated and then subjected to undrained heating-cooling in the temperature range of 21 to 37 °C. Results obtained are compared with an existing laboratory study on another type of clay.

2020 ◽  
Vol 205 ◽  
pp. 05022
Author(s):  
Michael B. Reiter ◽  
Lydia Kurtz ◽  
Mohammed M. Attala ◽  
Tugce Baser

This study focuses on the evolution of shaft resistance during operation of a geothermal energy foundation installed in a saturated glacial till layer. Energy foundations are a sustainable alternative to traditional space heating and cooling approaches for buildings. Despite efficient operational performance, there are still valid concerns regarding the effects of heating on the structural performance of foundations. To investigate the effect of heating at the soil-pile interface, four drilled shafts are utilized as energy foundations on the Urbana-Champaign campus of the University of Illinois and instrumented. Although the energy foundations are not yet operational, a theoretical investigation is possible to understand the effects of heating on the evolution of thermally induced pore water pressures and the shaft resistance of an energy foundation. A thermo-poroelastic numerical model is validated against an analytical solution, then is used to analyze the thermo-mechanical response of the soil-structure system under different conditions. The results indicate that the evolution of pore water pressure is affected by the rate of heating and the hydraulic conductivity of the surrounding soil, as expected. Higher pore water pressures are generated in the case of low hydraulic conductivity and higher rates of heating. Prior to the dissipation of excess pore pressures, the changes in shaft resistance are variable and influenced by the thermally-induced deformation of the foundation and the surrounding soil.


Géotechnique ◽  
2019 ◽  
Vol 69 (5) ◽  
pp. 434-457 ◽  
Author(s):  
M. S. P. Wan ◽  
J. R. Standing ◽  
D. M. Potts ◽  
J. B. Burland

Géotechnique ◽  
2006 ◽  
Vol 56 (8) ◽  
pp. 523-537 ◽  
Author(s):  
J. A. Smethurst ◽  
D. Clarke ◽  
W. Powrie

2007 ◽  
Vol 89 (1-2) ◽  
pp. 144-154 ◽  
Author(s):  
Hossam M. Abuel-Naga ◽  
Dennes T. Bergado ◽  
Abdelmalek Bouazza

Géotechnique ◽  
2019 ◽  
pp. 1-5 ◽  
Author(s):  
Michael S. P. Wan ◽  
Jamie R. Standing ◽  
David M. Potts ◽  
John B. Burland ◽  
Steve Parker ◽  
...  

2007 ◽  
Vol 32 (8-14) ◽  
pp. 937-946 ◽  
Author(s):  
Herbert Kull ◽  
Norbert Jockwer ◽  
Chun-Liang Zhang ◽  
Yannick Wileveau ◽  
Stéphane Pepa

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