乾湿繰返し下における玄武岩繊維補強低炭素セメント固化シールドトンネルズリの力学特性と損傷進展

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Materials researchers can learn about the synergistic effect of industrial waste-based cement and basalt fibers on durability under cyclic wetting.

🏢実務担当者:Civil engineering firms may consider this approach for sustainable tunnel spoil disposal and improved long-term stability.

本研究旨在通过使用多种工业固体废弃物部分替代水泥，开发一种绿色复合胶凝材料（GCCM），并通过掺入玄武岩纤维（BF）进一步增强其韧性，以实现盾构隧道渣土（STS）的有效处置。通过无侧限抗压强度（UCS）试验、质量损失和P波波速测量，以及工业计算机断层扫描（CT）和扫描电子显微镜（SEM），系统研究了在干湿（D-W）循环作用下，GCCM和BF协同改良STS的劣化行为。结果表明，BF显著提高了STS的早期强度和变形韧性，在0.45% BF掺量下，UCS最优增幅约为13%。尽管随着D-W循环次数的增加，试件的力学性能发生劣化，但BF的“桥接效应”有效抑制了裂纹的扩展和贯通。定量CT分析进一步揭示，在八次D-W循环后，掺入1.00% BF使孔隙体积（Vk）和裂纹体积（Vl）分别减少了54.3%和63.2%。损伤机制主要归因于水分迁移引起的胶凝材料流失以及黏土矿物的膨胀-收缩应力。BF形成的三维（3D）网络结构通过其拔出耗能机制，有效维持了材料的宏观和微观结构完整性。本研究凸显了将GCCM与BF相结合以增强STS长期耐久性的新颖性，为其在复杂环境中的绿色处置和工程应用提供了理论基础和技术支持。

AI 翻訳（deepseek-v4-flash）。 正確を期す場合は下の原文を参照してください。

This study aims to develop a green composite cementitious material (GCCM) by partially replacing cement with multiple industrial solid wastes and to further enhance its toughness by incorporating basalt fibers (BF) for the effective disposal of shield tunnel spoil (STS). The deterioration behavior of STS synergistically improved by GCCM and BF was systematically investigated under drying–wetting (D-W) cycles using unconfined compressive strength (UCS) tests, mass loss and P-wave velocity measurements, as well as industrial computed tomography (CT) and scanning electron microscopy (SEM). The results show that BF significantly improves the early-age strength and deformation toughness of STS, with an optimal UCS increase of about 13% at 0.45% BF. Although the mechanical properties of the specimens deteriorated with an increasing number of D-W cycles, the “bridging effect” of BF effectively inhibited the propagation and coalescence of cracks. Quantitative CT analysis further revealed that the addition of 1.00% BF reduced the pore volume (Vk) and crack volume (Vl) by 54.3% and 63.2%, respectively, after eight D-W cycles. The damage mechanism is primarily attributed to the loss of cementitious materials caused by water migration and the swelling–shrinkage stress of clay minerals. The three-dimensional (3D) network structure formed by BF, through its pull-out energy dissipation mechanism, effectively maintained the macro- and microstructural integrity of the material. This study highlights the novelty of combining GCCM with BF to enhance the long-term durability of STS, providing a theoretical basis and technical support for its green disposal and engineering application in complex environments.

• openalex https://doi.org/10.3390/ma19101920first seen 2026-05-17 06:23:49 · last seen 2026-06-06 04:59:03