Influences of salt solution concentration vertical stress during saturation on the volume change behavior of compacted GMZ01 bentonite

Abstract : Investigation of the effects of salt solution concentration vertical stress during saturation on the volume change behavior of compacted bentonite is of great importance for the assessment of the behavior of engineering barrier in deep geological repository for disposal of high-level radioactive waste. In this study, oedometer tests were conducted on densely compacted GMZ01 bentonite specimens with an initial dry density of 1.70 Mg/m(3), which experienced swelling under different vertical stresses with infiltration of de-ionized water or NaCl solutions at different concentrations. The effects of salt solution concentration vertical stress during saturation on the volume change of GMZ01 bentonite specimens were investigated in terms of swelling strain, elastic compressibility parameter, plastic compressibility parameter yield stress. Results show that as the concentrations of salt solutions increase, the swelling strain, the elastic compressibility parameter the plastic compressibility parameter decrease, while the yield stress increases. However, the vertical stress during saturation can only affect the swelling strain the yield stress. Based on the test results, empirical equations with consideration of salt solution concentration vertical stress during saturation effects were proposed allowing the prediction of swelling strain, plastic compressibility parameter yield stress. The calculated results are in good agreement with the experimental ones. (C) 2016 Elsevier B.V. All rights reserved.
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Engineering Geology, Elsevier, 2016, 207, pp.48-55. 〈10.1016/j.enggeo.2016.04.010〉
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Soumis le : jeudi 10 août 2017 - 14:23:42
Dernière modification le : jeudi 11 janvier 2018 - 06:25:23

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Feng Zhang, Wei-Min Ye, Yong-Gui Chen, Bao Chen, Yu-Jun Cui. Influences of salt solution concentration vertical stress during saturation on the volume change behavior of compacted GMZ01 bentonite. Engineering Geology, Elsevier, 2016, 207, pp.48-55. 〈10.1016/j.enggeo.2016.04.010〉. 〈hal-01573700〉

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