Advertisement

Thermal Volumetric Behaviour of Compacted GMZ Bentonite Saturated with Salt Solution

  • Yong-Gui Chen
  • Xin-xin Dong
  • Xu-dong Zhang
  • Wei-Min Ye
  • Yu-Jun Cui
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

Gaomiaozi (GMZ) bentonite has been confirmed as the buffer material in the Chinese disposal program of high-level waste. To investigate the thermal volumetric behaviour of compacted GMZ bentonite, several stress paths were performed on the specimens presaturated with NaCl solutions to obtain the scheduled OCR and verticle stress. Then multi-step heating-cooling tests were conducted. Test results show that thermal volume change strongly depends on the vertical pressure, OCR and concentration of the presaturation solution. For the specimens presaturation with deionized water, heating induces contraction below the transition temperature and followed by dilation at normal consolidation state, while only induces dilation at overconsolidation state. A larger vertical pressure leads to a larger transition temperature. For the specimens presaturated with NaCl solutions, heating basically induces dilation. The specimens with large vertical pressure accumulate a total contraction after a thermal cycle. For a given concentration and verticle pressure, the specimens cumulate a larger irreversible dilation at higher OCR. The influence of salt solution is non-monotonic. The dilute solution and high saline solution significantly promote the thermal expansion of saturated GMZ bentonite during heating.

Keywords

GMZ bentonite Thermal volumetric behaviour Salt solution Vertical pressure OCR 

Notes

Acknowledgements

The authors are grateful to the National Natural Science Foundation of China (41422207 & 41772279), China Atomic Energy Authority ([2011]1051) and Fundamental Research Funds for the Central Universities.

References

  1. Abuel-Naga HM, Bouazza BA, Ramana GV (2007) Volume change behaviour of saturated clays under drained heating conditions: experimental results and constitutive modelling. Can Geotech J 44:942–956CrossRefGoogle Scholar
  2. Baldi G, Hueckel T, Peano A, Pellegrini R (1991) Developments in Modelling of Thermo-Hydro-Mechanical Behaviour of Boom Clay and Clay-Based Buffer Materials. Commission of European Communities, LuxembourgGoogle Scholar
  3. Baldi G, Hueckel T, Pellegrini R (1988) Thermal volume changes of the mineral water-system in low-porosity clay soils. Can Geotech J 25:807–825CrossRefGoogle Scholar
  4. Barbour SL, Fredlund DG (1989) Mechanisms of osmotic flow and volume change in clay soils. Can Geotech J 26:551–562CrossRefGoogle Scholar
  5. Cui YJ, Sultan N, Delage P (2000) A thermomechanical model for saturated clays. Can Geotech J 37:607–620CrossRefGoogle Scholar
  6. Cui YJ, Tang AN, Qian LX, Ye WM, Chen B (2011) Thermal-mechanical behavior of compacted GMZ bentonite. Soils Found 51:1065–1074CrossRefGoogle Scholar
  7. Favero V, Ferrari A, Laloui L (2016) Thermo-mechanical volume change behaviour of Opalinus Clay. Int J Rock Mech Min Sci 90:15–25CrossRefGoogle Scholar
  8. Hueckel T, Baldi G (1990) Thermoplasticity of saturated clays - experimental constitutive study. J Geotech Eng-ASCE 116:1778–1796CrossRefGoogle Scholar
  9. Ma QJ, Ng CWW, Masin D, Zhou C (2017) An approach for modelling volume change of fine-grained soil subjected to thermal cycles. Can Geotech J 54:896–901CrossRefGoogle Scholar
  10. Ng C, Cheng Q, Zhou C, Alonso EE (2016) Volume changes of an unsaturated clay during heating and cooling. Geotechn Lett 6:192–198CrossRefGoogle Scholar
  11. Romero E, Gens A, Lloret A (2003) Suction effects on a compacted clay under non-isothermal conditions. Geotechnique 53:65–81CrossRefGoogle Scholar
  12. Romero E, Villar MV, Lloret A (2005) Thermo-hydro-mechanical behaviour of two heavily overconsolidated clays. Eng Geol 81:255–268CrossRefGoogle Scholar
  13. Sellin P, Leupin OX (2013) The use of clay as an engineered barrier in radioactive-waste management - a review. Clays Clay Miner 61:477–498CrossRefGoogle Scholar
  14. Sultan N, Delage P, Cui YJ (2002) Temperature effects on the volume change behaviour of Boom clay. Eng Geol 64:135–145CrossRefGoogle Scholar
  15. Tang AM, Cui YJ, Barnel N (2008) Thermo-mechanical behaviour of a compacted swelling clay. Geotechnique 58:45–54CrossRefGoogle Scholar
  16. Towhata I, Kuntiwattanakul P, Seko I, Ohishi K (1993) Volume change of clays induced by heating as observed in consolidation tests. Soils Found 33:170–183CrossRefGoogle Scholar
  17. Uchaipichat A, Khalili N (2009) Experimental investigation of thermohydro-mechanical behaviour of an unsaturated silt. Geotechnique 59:339–353CrossRefGoogle Scholar
  18. Wen ZJ (2006) Physical property of China’s buffer material for high-level radioactive waste repositories. Chin J Rock Mechan Eng 25:794–800Google Scholar
  19. Ye WM, Zhang YW, Chen YG, Chen B, Cui YJ (2013) Experimental investigation on the thermal volumetric behavior of highly compacted GMZ01 Bent. Appl Clay Sci 83–84:210–216CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Yong-Gui Chen
    • 1
  • Xin-xin Dong
    • 1
  • Xu-dong Zhang
    • 1
    • 2
  • Wei-Min Ye
    • 1
  • Yu-Jun Cui
    • 3
  1. 1.Department of Geotechnical EngineeringTongji UniversityShanghaiPeople’s Republic of China
  2. 2.Anhui Transport Consulting and Design Institute Co., LtdHefeiPeople’s Republic of China
  3. 3.Laboratory Navier/CERMESEcole des Ponts-ParisTechMarne-la-ValléeFrance

Personalised recommendations