Study on mechanical properties and toughness characteristics of fiber reinforced storage backfill after carbonation curing

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-05-02 DOI:10.1016/j.istruc.2025.108996

Wei He , Lang Liu , Baoning Wei , Ruofan Wang , Zhiyu Fang , Huisheng Qu , Dengdeng Zhuang , Yuheng Gao , Lei Xia , Zihan Wang

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引用次数: 0

Abstract

CO₂ physical-chemical synergistic storage can be achieved by constructing functional backfill space in mine goaf. Exploring the mechanical properties and toughness characteristics of storage backfill is an important index to evaluate the safe operation of storage CO₂ storage. In high concentration CO₂ curing environment, the storage backfill will undergo severe carbonation reaction. Through uniaxial compression, compressive toughness and flexural toughness experiments, the strength characteristics, toughness index, deformation and failure mechanism of fiber-reinforced storage backfill after carbonation were studied for the first time, and the action mechanism of carbonation reinforcement and fiber toughening was revealed. The carbonation reaction can increase the strength performance of the storage backfill by 1.56–2.32 times by chemical enhancement, but the toughness index decreases from 4.14 to 1.48, which will pose a potential threat to the security and stability of the storage. In order to eliminate the safety hazard of CO₂ storage backfill, it is recommended to add fiber into the storage backfill material. The fiber improves the strength of the storage backfill by a factor of 1.51–1.73 through physical strengthening and toughening, while increasing the toughness index from 4.14 to 7.09. This study demonstrates that it is effective to use fiber to improve the toughness characteristics of carbonized storage backfill and provides an important idea and reference for the selection of backfill materials for storage CO₂ storage.

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碳化固化后纤维增强储层充填体力学性能及韧性特性研究

通过在采空区构造功能充填空间，可以实现CO2的物化协同封存。研究储库充填体的力学性能和韧性特性是评价储库CO2储库安全运行的重要指标。在高浓度CO2固化环境下，储层充填体会发生剧烈的碳酸化反应。通过单轴压缩、压缩韧性和弯曲韧性试验，首次研究了碳化后纤维增强储层充填体的强度特性、韧性指标、变形破坏机理，揭示了碳化增强和纤维增韧的作用机理。碳酸化反应可使储层充填体的强度性能通过化学增强提高1.56 ~ 2.32倍，但韧性指数由4.14降至1.48，对储层的安全稳定构成潜在威胁。为了消除CO2储存回填的安全隐患，建议在储存回填材料中添加纤维。纤维通过物理强化和增韧，提高了储层充填体的强度，提高强度的倍数为1.51 ~ 1.73 ，韧性指数由4.14提高到7.09。研究表明，利用纤维改善碳化储层充填体的韧性特性是有效的，为储层CO2储层充填体材料的选择提供了重要的思路和参考。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.