Influence of strain-rate on hydromechanical behavior of highly compacted GMZ01 bentonite

Abstract : During the long-term operation of a deep geological repository in crystalline rock, saturation of buffer/backfill materials will last for a long period of time. Investigation on time-dependent property of buffer/backfill materials is of great importance for long-term safety assessment of the repository. In this work, GMZ01 bentonite powder was statically compacted to specimens with a dry density of 1.70 g/cm3 and suction-equilibrated to their target values. Then, a series of suction-controlled constant rate of strain (CRS) tests (including single-stage and step-wise CRS tests) were conducted for the investigation of the strain rate-dependent compression behavior of highly compacted GMZ01 bentonite. Comparisons were made between the results of the single-stage and step-wise CRS tests under given suctions for the verification of the applicability of the isotache concept on the compacted GMZ01 bentonite. Based on that, the step-wise CRS compression tests were performed and results were presented in terms of vertical stress–vertical strain curves. Based on the test results, the virgin compression index λ and the yield stress p0 were determined. Analysis indicates that λ decreases, while p0 increases with increasing suction. Furthermore, p0 increases with increasing CRS, which is consistent with previous researches on saturated soils. Finally, a logarithm function proposed between α(s) and suction s is verified and several relevant parameters are fitted, which represents the coupling of suction, time and stress of GMZ01 bentonite.
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Engineering Geology, Elsevier, 2015, pp.85-92. 〈10.1016/j.enggeo.2015.05.028〉
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https://hal-enpc.archives-ouvertes.fr/hal-01271681
Contributeur : Yu-Jun Cui <>
Soumis le : mardi 9 février 2016 - 15:05:52
Dernière modification le : jeudi 11 janvier 2018 - 06:25:23

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Pengjun Qui, Wei-Min Ye, Y.G. Chen, Bao Chen, Yu-Jun Cui. Influence of strain-rate on hydromechanical behavior of highly compacted GMZ01 bentonite. Engineering Geology, Elsevier, 2015, pp.85-92. 〈10.1016/j.enggeo.2015.05.028〉. 〈hal-01271681〉

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