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Swelling of unsaturated GMZ07 bentonite at different temperatures

  • Junran Zhang
  • De’an SunEmail author
  • Haihao YuEmail author
  • Jianghong Jiang
  • Yongfu Xu
Original Paper
  • 74 Downloads

Abstract

A series of wetting tests on unsaturated compacted GMZ07 sodium bentonite, taken from the Gaomiaozi area, Inner Mongolia, China, was performed to investigate the swelling characteristics of the GMZ07 sodium bentonite at temperatures of 5, 20, 60 and 75 °C. The influences of temperature and initial dry density on swelling deformation and swelling pressure were studied by performing a series of constant-stress and constant-volume tests under the wetting condition. The test results showed that the swelling deformation and swelling pressure due to saturation decreased slightly with increasing temperature. A linear relationship was present between the vertical pressure and corresponding saturated void ratio in the semi-logarithmic coordinate at a given temperature; this line is referred to as a state line. Swelling or collapse due to saturation was found to be dependent on the relative location of the initial state between the state line and initial state. The void ratios after saturation at different initial dry densities were close at the same temperature and vertical pressure.

Keywords

GMZ bentonite Swelling Temperature Sodium chloride Swelling pressure 

Notes

Acknowledgements

This research was partially supported by the National Natural Science Foundation of China (Grant Nos. 41602295, 41630633 and 11672172).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Henan Province Key Laboratory of Geotechnical and Structural EngineeringNorth China University of Water Resources and Electric PowerZhengzhouChina
  2. 2.Department of Civil EngineeringShanghai UniversityShanghaiChina
  3. 3.Guangxi Key Laboratory of Geomechanics and Geotechnical EngineeringGuilin University of TechnologyGuilinChina
  4. 4.Department of Civil EngineeringShanghai JiaoTong UniversityShanghaiChina

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