Investigation on the damage model of rock subjected to freeze-thaw cycles considering its fracture voids compaction

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL Cold Regions Science and Technology Pub Date : 2024-05-03 DOI:10.1016/j.coldregions.2024.104222

Sheng Shi , Fengjin Zhu , Hongqiang Hu

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Abstract

The investigation on the mechanical properties and damage model of rock subjected to freeze-thaw cycles (FTCs) holds significant theoretical for assessing the deformation of rock mass engineering in cold regions. When the rocks subjected to FTCs, the fracture voids of rocks increase with increasing number of FTCs, and the rocks exhibit nonlinear deformation characteristics as its fracture voids compaction. Based on the dissipation energy evolution law and distribution characteristics of rocks under loading, the critical point of rock compaction deformation was determined. A constitutive model for rock subjected to FTCs considering its fracture voids compaction was established based on macroscopic and microscopic damage levels. The rationality of the model was validated using experimental results, and a comparison was made between the calculation results of proposed model and model that not consider fracture voids compaction. The evolution properties of rock damage variable and stress under different FTCs were analyzed. The variation of model parameters with the FTCs and the influence of model parameters on the deformation characteristics of rock was analyzed.

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考虑裂隙压实的冻融循环岩石破坏模型研究

研究冻融循环（FTCs）作用下岩石的力学性能和破坏模型，对于评估寒冷地区岩体工程的变形具有重要的理论意义。当岩石受到冻融循环作用时，岩石的断裂空隙会随着冻融循环次数的增加而增大，岩石会随着其断裂空隙的压实而表现出非线性变形特征。根据岩石在荷载作用下的耗能演化规律和分布特征，确定了岩石压实变形的临界点。基于宏观和微观损伤程度，建立了考虑断裂空隙压实的受 FTCs 作用的岩石构成模型。利用实验结果验证了模型的合理性，并将所建模型的计算结果与未考虑断裂空隙压实的模型进行了比较。分析了不同 FTC 条件下岩石损伤变量和应力的演变特性。分析了模型参数随 FTCs 的变化以及模型参数对岩石变形特征的影响。

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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.