Three-dimensional evaluation of effective thermal conductivity in micro-carbon fiber reinforced clay soils with varying fiber distributions

IF 3.7 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2025-09-15 DOI:10.1016/j.gete.2025.100743

Yuan Feng , Jongwan Eun , Seunghee Kim , Yong-Rak Kim

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引用次数: 0

Abstract

The effective thermal conductivity of Micro-Carbon Fiber Reinforced Soil (MCFRS) is critical in geothermal, energy, and environmental engineering. Due to the influence of the filament's shape of carbon fibers, it is important to understand the effect of fiber distribution in interpreting the thermal conductivity of fiber-reinforced soil. In this study, we evaluated the thermal conductivity of MCFRS using analytical solutions and finite element simulation methods in three-dimensional space, and discussed the effects of carbon fiber distribution and fiber type on thermal conductivity. The results showed that adding carbon fiber can effectively improve the thermal conductivity of soil, and the thermal conductivity of MCFRS was closely related to the distribution of fibers. By adding 1.0 % carbon fiber with a thermal conductivity of 1000 W/(m·K), the thermal conductivity of the composite material can be increased up to 292 %. Furthermore, the thermal conductivity of MCFRS is closely related to the distribution of fibers. In the case of parallel distribution, the thermal conductivity was 1.87 and 1.47 times that of purely random distribution and random distribution in the XZ/XY-plane, respectively, if the heat transfer is in the X-axis direction. This study provides evidence for the potential improvement of the thermal conductivity of MCFRS.

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不同纤维分布的微碳纤维增强粘土有效导热系数的三维评价

微碳纤维增强土（MCFRS）的有效导热性能在地热、能源和环境工程中具有重要意义。由于碳纤维细丝形状的影响，了解纤维分布对纤维增强土导热系数的影响对解释纤维增强土的导热系数具有重要意义。在本研究中，我们采用解析解和有限元模拟方法在三维空间中评估了MCFRS的导热系数，并讨论了碳纤维分布和纤维类型对导热系数的影响。结果表明，添加碳纤维能有效提高土壤导热系数，MCFRS的导热系数与纤维的分布密切相关。加入1.0 %导热系数为1000 W/（m·K）的碳纤维，复合材料的导热系数可提高到292 %。此外，MCFRS的热导率与纤维的分布密切相关。在平行分布的情况下，x轴方向的传热，在XZ/ xy平面上的导热系数分别是纯随机分布和随机分布的1.87倍和1.47倍。该研究为MCFRS导热性能的潜在改善提供了证据。

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.