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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermo-hydro-mechanical properties of bentonite-sand-graphite- polypropylene fiber mixtures as buffer materials for a high-level radioactive waste repository
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Thermo-hydro-mechanical properties of bentonite-sand-graphite- polypropylene fiber mixtures as buffer materials for a high-level radioactive waste repository

机译：膨润土 - 砂石墨 - 聚丙烯纤维混合物的热水 - 水力学性能作为高级放射性废物储存库的缓冲材料

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摘要

In accordance with the conception of repository, the performance of buffer materials around the canister are critical to the long-term safe operation of deep geological repositories for high-level radioactive waste (HLW). To investigate the thermo-hydro-mechanical (THM) properties of bentonite-sand-graphite-poly propylene fiber (BSGF) mixtures as buffer material, the thermal and hydraulic conductivity, swelling and cracking, strength tests were conducted in this paper. From the microscopic, the heat transfer mechanism, penetration mechanism, swelling mechanism and shear mechanism of BSGF mixtures were investigated in detail. Results revealed that the addition of graphite and polypropylene fiber (PPF) can significantly improve thermal conductivity and strength of BSGF mixtures. Compared with bentonitesand mixtures, the thermal conductivity, the unconfined compressive strength (UCS) and shear strength (cohesion) of BSGF mixtures increased by 20-68%, 12-23% and 21-48%, respectively. Nevertheless, the internal friction angle had little change. The addition of PPF controlled the width, area, and propagation of the cracks through the interlacing effect of the fibers. However, the addition of graphite and PPF can also hinder the development of swelling pressure and improve the hydraulic conductivity of BSGF mixtures. In addition, for BSGF mixtures used as buffer material of HLW storage, the sand content should be retained below 31% and 32% respectively to ensure the maximum swelling pressure and hydraulic conductivity to meet the requirements of the specification. From the view of heat dissipation and strength, sand content shall not exceed 30% and 27%, respectively. Therefore, the effective sand content should not exceed 27% considering the THM properties. This study provides a new buffer material for HLW deep geological repository and enhances the stability and functionality of HLW deep geological repository. (C) 2019 Elsevier Ltd. All rights reserved.
机译：根据储存库的概念，罐周围的缓冲材料的性能对于高级放射性废物（HLW）的深层地质存储库的长期安全运行至关重要。为了研究膨润土 - 砂石墨聚丙烯纤维（BSGF）混合物作为缓冲材料的热 - 水力 - 机械（THM）性能，本文进行了热和液压导电，溶胀和开裂，强度试验。从显微镜，详细研究了BSGF混合物的传热机理，渗透机理，膨胀机理和剪切机理。结果表明，添加石墨和聚丙烯纤维（PPF）可以显着提高BSGF混合物的导热系数和强度。与膨润土和混合物相比，BSGF混合物的导热率，非束缚的压缩强度（UCS）和剪切强度（内聚力）分别增加20-68％，12-23％和21-48％。然而，内部摩擦角度几乎没有变化。通过纤维的隔离效果控制PPF的宽度，面积和传播控制宽度，面积和传播。然而，添加石墨和PPF也可以妨碍溶胀压力的发展，提高BSGF混合物的液压导电性。此外，对于用作HLW储存的缓冲材料的BSGF混合物，砂含量应分别保留在31％和32％以下，以确保最大的溶胀压力和液压导电性，以满足规范的要求。从散热和强度的角度来看，砂含量分别不超过30％和27％。因此，考虑到THM性能，有效的砂含量不应超过27％。本研究为HLW深层地质存储库提供了新的缓冲材料，并提高了HLW深层地质库的稳定性和功能。 （c）2019 Elsevier Ltd.保留所有权利。

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