摘要
为研究冻融循环作用对砂岩物理力学特性的影响,针对不同含水质量分数的砂岩,开展不同冻融循环次数的冻融循环试验和单轴压缩试验。基于岩石损伤力学理论,构建砂岩冻融-载荷耦合损伤模型,并验证模型的可靠性。研究结果表明:随着冻融循环次数的增加,砂岩产生累积冻融损伤,导致其强度降低,变形量增加。冻融-载荷作用下岩石总损伤值的变化曲线整体呈“S”形,验证了该损伤模型对受载冻融砂岩力学特性的适配性。研究结论可为寒区隧道工程冻害灾变防治提供参考。
To study the effects of freeze-thaw cycles on sandstone's physical and mechanical properties,freezethaw cycle tests and uniaxial compression tests with different numbers of freeze-thaw cycles were carried out on sandstone with different water content.Based on the theory of rock damage mechanics,a coupled frost-thaw-load damage model of sandstone was established,and the model's reliability was verified with experimental results.The results show that as the number of freeze-thaw cycles increases,sandstone produces cumulative freeze-thaw damage,decreasing sandstone strength and increasing deformation.The change in the total damage value of the freeze-thaw-loaded rock shows an overall“S”trend.This proves that this damage model can better describe the adaptability of the mechanical properties of the loaded freeze-thaw sandstone.The research results can provide a reference for preventing and controlling freezing disasters of tunnel engineering in cold areas.
作者
梁勇
LIANG Yong(China Railway 19th Bureau Group Sixth Engineering Company Limited,Wuxi 214000,China)
出处
《辽宁工程技术大学学报(自然科学版)》
北大核心
2025年第4期430-439,共10页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金项目(51704144)
辽宁省教育厅科学技术研究重点项目(JYTZD2023077)。
关键词
冻融损伤
冻融循环
物理特性
力学特性
损伤模型
寒区隧道
freeze-thaw damage
freeze-thaw cycles
physical property
mechanical properties
damage modelcold
regional tunnel
