冻融循环下砂岩微观孔隙结构的演变及劣化机理

IF 3.7 2区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2024-09-15 DOI:10.1007/s10064-024-03901-9
Junyue Zhang, Guibin Wang, Changkun Ma, Huandui Liu, Mengmeng Yang
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引用次数: 0

摘要

岩石孔隙在冻融循环作用下开裂和膨胀,导致其物理和机械性能下降,因此有必要研究其演变和劣化机理。然而,现有研究大多采用单一的孔隙测试方法,忽略了解冻过程对岩石冻胀破坏的影响。针对这一问题,本研究结合核磁共振(NMR)和计算机断层扫描(CT)等非破坏性测试技术,全面分析了冻融循环过程中孔隙的演变。研究冻融过程中孔隙水的迁移和再分布及其对砂岩冻融破坏的影响。最后,研究了冻融循环过程中砂岩中孔隙冻浪的引发和传播机制。结果表明,冻融循环会导致样本内所有尺度的孔隙体积膨胀。不过,膨胀程度各不相同,大孔隙、中孔隙和微孔的膨胀程度依次较小。在冻融过程中,砂岩孔隙中的水会重新分布,从较大的孔隙向较小的孔隙移动。微孔中水的饱和度增加,而中孔和大孔中的饱和度降低,从而使微孔在随后的冻融循环中更容易引发冻胀。在反复冻融的作用下,岩石孔隙会沿着抗拉强度最低的方向继续扩张,最终形成宏观裂缝。这项研究为了解岩体冻融灾害的成因机制提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Evolution of microscopic pore structure and deterioration mechanism of sandstone subjected to freeze-thaw cycles

Rock pores crack and expand subjected to freeze-thaw cycles, resulting in the reduction of their physical and mechanical properties, it is necessary to study its evolution and deterioration mechanism. However, the majority of existing studies employ a singular pore testing methodology, and neglecting the impact of the thawing process on frost heave damage in rocks. To address this, this study employs a combination of non-destructive testing techniques, including nuclear magnetic resonance (NMR) and computed tomography (CT) scanning, to comprehensively analyze the evolution of pores during freeze-thaw cycles. Investigating the migration and redistribution of pore water and its effect on frost heave damage in sandstone during the freeze-thaw process. Finally, the study examines the mechanisms of pores frost heave initiation and propagation in sandstone during freeze-thaw cycles. The results demonstrate that freeze-thaw cycles result in an expansion of pore volume at all scales within the samples. However, the degree of expansion varies, with macropores, mesopores, and micropores exhibiting a less pronounced increase in sequence. During the freeze-thaw process, water in sandstone pores redistributes, moving from larger to smaller pores. The saturation of water increases in micropores, but decreases in mesopores and macropores, thereby rendering micropores more susceptible to frost heave initiation in subsequent freeze-thaw cycles. With repeated freeze-thaw, the expansion of rock pores will continue in the direction of the lowest tensile strength, eventually forming macroscopic cracks. This study provides valuable insights into the mechanisms of freeze-thaw disaster genesis in rock masses.

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来源期刊
Bulletin of Engineering Geology and the Environment
Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合
CiteScore
7.10
自引率
11.90%
发文量
445
审稿时长
4.1 months
期刊介绍: Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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