Experimental investigations on thermo-hydro-mechanical properties of compacted GMZ01 bentonite-sand mixture using as buffer materials

Abstract : Bentonite-sand mixture has been proposed as engineered barriers for high-level waste disposal in many countries. For investigation of the thermo-hydro-mechanical properties of compacted GMZ01 bentonite-sand mixture, swelling pressure, hydraulic thermal conductivity tests were conducted in this paper. Results show that addition of sand will increase the thermal conductivity of the mixture. However, depending on the dry density water content of the specimen, the increasing rate of thermal conductivity becomes stable or even decreases with further increase of sand content. The addition of sand will also impede the development of swelling pressure while the inhibiting effect becomes weak as the sand content increases. In the meantime, with increasing sand content, the hydraulic conductivity of the mixture will increase significantly, especially at higher sand contents. Analysis shows that, sand content should be kept below 38% 39% to guarantee the swelling pressure above 1.0 MPa the hydraulic conductivity lower than 1.0-12 m/s, respectively. The most effective sand content in the view of heat dissipation of buffer materials is <30%. Therefore, the preferential option of sand content in the mixture should not be >30% in view point of thermal-hydra-mechanical properties. (C) 2016 Elsevier B.V. All rights reserved.
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Engineering Geology, Elsevier, 2016, 213, pp.46-54. 〈10.1016/j.enggeo.2016.08.015〉
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Soumis le : jeudi 10 août 2017 - 14:23:36
Dernière modification le : jeudi 11 janvier 2018 - 06:25:23

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L. Xu, Wei-Min Ye, Bao Chen, Yong-Gui Chen, Yu-Jun Cui. Experimental investigations on thermo-hydro-mechanical properties of compacted GMZ01 bentonite-sand mixture using as buffer materials. Engineering Geology, Elsevier, 2016, 213, pp.46-54. 〈10.1016/j.enggeo.2016.08.015〉. 〈hal-01573694〉

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