Finite element modeling of thermo-active diaphragm walls

Abstract

There are two major challenges faced by modern society: energy security, and lowering carbon dioxide gas emissions. Thermo-active diaphragm walls have a large potential to remedy one of these problems, since they are a renewable energy technology that uses underground infrastructure as a heat exchange medium. However, extensive research is required to determine the effects of cyclic heating and cooling on their geotechnical and structural performance. In this paper, a series of detailed finite element analyses are carried out to capture the fully coupled thermo-hydro-mechanical response of the ground and diaphragm wall. It is demonstrated that the thermal operation of the diaphragm wall causes changes in soil temperature, thermal expansion/shrinkage of pore water, and total stress applied on the diaphragm wall. These, in turn, cause displacements of the diaphragm wall and variations of the bending moments. However, these effects on the performance of diaphragm wall are not significant. The thermally induced bending strain is mainly governed by the temperature differential and uneven thermal expansion/shrinkage across the wall.

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Acknowledgements

This research work was part of the Centre for Smart Infrastructure and Construction at University of Cambridge. We thank Professor Kenichi Soga, (UC Berkeley) for advice and help that greatly improved the research results.

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Correspondence to Mei Yin.

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Rui, Y., Yin, M. Finite element modeling of thermo-active diaphragm walls. Front. Struct. Civ. Eng. (2020). https://doi.org/10.1007/s11709-020-0584-9

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Keywords

  • thermo-active diaphragm wall
  • finite element analysis
  • thermo-hydro-mechanical coupling
  • ground source heat pump