基于离散元的充水裂隙岩体冻融损伤研究

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2025-05-22 DOI:10.1016/j.compgeo.2025.107343

Fengqi Shen , Wenliang Qiu , Kai Xie , Mingming Xing , Haowei Zhu , Shibo Huang

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引用次数: 0

摘要

裂隙岩体冻融破坏严重威胁着岩土工程的安全。现有研究缺乏裂隙岩体冻融循环的数值模拟。本文提出了一种基于离散元模型（DEM）的含水裂隙岩石冻融损伤模拟方法。采用颗粒膨胀法和有效体积膨胀法分别模拟孔隙水和裂缝水的冻胀。考虑了冻融循环过程中含水量的变化。通过与实验结果的比较，验证了该模型的有效性。分析了不同冻融循环次数和不同断裂倾角下冻融损伤和开裂行为的演变过程。数值结果表明，经过几次冻融循环后，裂缝水冻融损伤的影响大于孔隙水冻融损伤的影响。冻融循环40次后，裂隙岩石峰值应力降低67%。裂缝的抗裂范围控制着冻融损伤，对于标准试样来说，0°裂缝倾角岩石的冻融损伤最大。裂缝倾角首先控制裂缝的扩展方向，然后转移到局部损伤区。该数值方法为了解冻融损伤和冻裂在寒冷地区的工程应用提供了有意义的工具。

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A discrete element-based study of freeze–thaw damage in water-filled fractured rock

Freeze–thaw damage to fractured rock severely threatens the safety of geotechnical engineering. The existing studies lack numerical modeling of freeze–thaw cycles in fractured rock. In this study, a discrete element model (DEM)-based method for simulating freeze–thaw damage in water-bearing fractured rock is proposed. Frost expansion of pore water and fracture water is simulated using the particle expansion method and effective volume expansion method, respectively. Changes in the water content during freeze–thaw cycles are considered. The proposed model is validated by comparison with laboratory results. The evolution of freeze–thaw damage and cracking behavior are analyzed for different numbers of freeze–thaw cycles and different fracture inclinations. The numerical results reveal that the effect of freeze–thaw damage caused by fracture water is greater than that of damage caused by pore water after a few freeze–thaw cycles. After 40 freeze–thaw cycles, the peak stress of the fractured rock decreases by 67%. The cracking resistance range of the fracture controls the freeze–thaw damage, and for standard samples, the freeze–thaw damage of the 0° fracture inclination rock is the greatest. The fracture inclination first controls the direction of fracture propagation and then shifts to the localized damage zone. This numerical approach provides a meaningful tool for understanding freeze–thaw damage and frost cracking in engineering application in cold regions.

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来源期刊

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.