低温下人工多孔岩石动态力学行为的实验与理论研究

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-05-26 DOI:10.1016/j.coldregions.2025.104562

Ying Xu , Zhedong Xu , Shaoling Zheng , Bangbiao Wu , Zhemin You

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引用次数: 0

摘要

在寒冷地区，风化岩石受到以零下温度和动力扰动为特征的复杂地质环境的影响。了解多裂纹岩石在实时低温条件下的动态压缩特性，对评估岩石工程的稳定性至关重要。为了模拟风化、多裂隙岩石，采用无粘土人工多孔岩（APR）作为试验材料。采用低温动态加载装置，在5种环境温度下进行了动态单轴压缩实验。还进行了互补准静态实验进行比较。通过核磁共振（NMR）、显微结构成像和失效模式评估分析了微观特征。结果表明，随着环境温度的降低，速率依赖性变得越来越显著。当加载速率低于560 GPa/s时，APR的动态单轴抗压强度（DUCS）随温度降低而降低。在此速率之外，DUCS与温度呈负相关，与天然多孔岩石相比，APR的DUCS趋势明显。这主要是由于动加载过程中未冻水的斯特凡效应和压力融化效应。在此基础上，提出了基于经典Ashby-Sammis微力学框架的动态本构模型，并进行了验证。该模型为预测寒区岩石工程的使用性能提供了理论支持。

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An experimental and theoretical investigation of the dynamic mechanical behavior of artificial porous rock under sub-zero temperatures

In cold regions, weathered rocks are subjected to complex geological environments characterized by sub-zero temperatures and dynamic disturbances. Understanding the dynamic compressive behavior of multi-cracked rocks under real-time low-temperature conditions is essential for assessing the stability of rock engineering. To simulate weathered, multi-cracked rocks, a clay-free artificial porous rock (APR) was used as the test material. Dynamic uniaxial compression experiments were performed at five ambient temperatures using a cryogenic-dynamic loading apparatus. Complementary quasi-static experiments were also conducted for comparison. The microscopic characteristics were analyzed through nuclear magnetic resonance (NMR), microstructural imaging, and failure mode evaluation. The results reveal that rate dependency becomes increasingly significant as ambient temperatures decreases. Specifically, when the loading rate is below 560 GPa/s, the dynamic uniaxial compressive strength (DUCS) of APR decreases with decreasing temperature. Beyond this rate, the DUCS exhibits a negative correlation with temperature, highlighting a distinct DUCS trend for APR compared to natural porous rocks. This behavior is primarily attributed to the Stefan effect of unfrozen water and the pressure melting effect during dynamic loading. Furthermore, a dynamic constitutive model based on the classic Ashby-Sammis micromechanical framework was proposed and validated. This model provides theoretical support for predicting the service performance of rock engineering 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.