基于声热联合监测的冻融砂岩损伤破坏前兆预警研究

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-09-13 DOI:10.1016/j.coldregions.2025.104679

Hui Liu , Mengjie Liu , Gengshe Yang , Xinyue Dai , Yanjun Shen , Bo Liang , Xiao Ding , Yali Xu , Runqi Wang

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引用次数: 0

摘要

冻融岩体损伤演化是寒区工程安全评价和灾害预警的重要依据。本研究采用声热监测来识别岩土失稳的前兆。通过将声发射（AE）参数（能量、振幅）与红外热成像指数（最高/平均辐射温度）相关联，我们动态表征了局部损伤从起始到剪切带形成到最终破坏的过程。提出了自相关系数和变异系数来定量描述冻融砂岩的加载破坏过程和局部化。分析了局部化的空间破坏特征，揭示了其损伤时间特征。研究结果表明，在0.8σc ~ σc时，声发射事件出现成核团簇，标志着局部形变的发生。冻融岩石的变形局部化区首先在中间形成，初始损伤位置对局部化区的形成和破坏模式有显著影响。声发射的自相关系数和变异系数的突变点可作为其形成时间的判据，时空熵曲线的变化规律反映了局域化阶段。随着冻融次数的增加，砂岩局部破坏时间提前。声热指标对比分析表明，与热参数相比，自相关系数在表征变形局部化方面表现出更高的灵敏度。红外热像仪与声发射监测相结合，显著提高了寒区岩石失稳和工程灾变前兆信号识别的可靠性。在隧道冻融灾害预警中，声发射与热成像技术相结合可以实现岩爆预警。在冻土边坡稳定性管理中，可构建三级风险分类阈值，为寒区工程的差别化支护决策提供理论支持。这更有利于提高寒区冻融岩石失稳破坏和岩石工程灾害前兆识别的可靠性。

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Research on precursory warning of damage and failure in freeze-thaw sandstone based on acoustic-thermal joint monitoring

Freeze-thaw rock damage evolution is crucial for safety assessment and disaster early warning in cold region engineering. This study implements acoustic-thermal monitoring to identify precursors of geotechnical instability. By correlating acoustic emission (AE) parameters (energy, amplitude) with infrared thermography indices (maximum/mean radiation temperature), we dynamically characterize localized damage progression from initiation through shear band formation to ultimate failure. The self-correlation coefficient and coefficient of variation are proposed to quantitatively describe the loading failure process and localization of freeze-thaw sandstone. The spatial failure characteristics of localization are analyzed, and the damage time characteristics are revealed. The research findings demonstrate that AE event nucleation clusters emerge at 0.8

σ_{c}

∼

σ_{c}

, signaling localized deformation initiation. The deformation localization zone of freeze-thaw rock is first formed in the middle, and the initial damage location significantly affects the formation and failure mode of the localization zone. The self-correlation coefficient and the mutation point of the coefficient of variation of the acoustic emission can be used as the criterion of its formation time, and the change rule of the time and space entropy curve reflects the localization stage. The localized failure time of sandstone is advanced with the increase of freeze-thaw times. Comparative analysis of acoustic-thermal indicators reveals that auto-correlation coefficients exhibit superior sensitivity in characterizing deformation localization compared to thermal parameters. The integration of infrared thermography and AE monitoring significantly enhances reliability in identifying precursory signals for rock instability and engineering catastrophes in cold regions.The combination of acoustic emission and thermal imaging technology can realize the advance warning of rock burst in the early warning of tunnel freeze-thaw disaster. In the stability management of frozen soil slope, a three-level risk classification threshold can be constructed to provide theoretical support for the differential support decision of engineering in cold regions. It is more advantageous to improve the reliability of freeze-thaw rock instability and failure and rock engineering disaster precursor identification in cold regions.

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来源期刊

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.