摘要
重叠冰作为海冰的一种生长形式,对冰区作业的海洋工程装备具有不可忽视的重要影响。本文通过实验室制备重叠冰,深入研究了重叠冰在单轴压缩作用下的破坏模式和强度特性,并且与同等条件下的单层冰进行了对比。研究表明,在应变速率为10^(-4)~10^(-2)/s时,重叠冰的破坏主要发生在冻结层,劈裂裂纹沿冻结层扩展;而单层冰则展现出韧性破坏、劈裂和碎裂3种模式,其劈裂裂纹发生在试样的不同位置。重叠冰和单层冰的压缩强度均随应变速率先增加后减小,在应变速率为10^(-3)/s附近达到最大。试验结果表明,重叠冰的单轴压缩强度通常低于同条件下形成的单层冰,其强度为单层冰的69%~83%。本研究为理解重叠冰的力学性质和抗冰结构设计条件提供了重要的理论参考。
The rafted ice,as a form of sea ice,has a significant impact on the equipment used in ice-covered areas.Based on indoor testing,this study thoroughly investigates the failure modes and strength characteristics of rafted ice under uniaxial compression and compares them with single-layer ice.The research shows that when the strain loading rate is 10^(−4)/s to 10^(−2)/s,the damage of the overlapping ice mainly occurs in the frozen layer,and the crack extends along the frozen layer.While single-layer ice exhibits three modes of ductile failure,splitting,and fragmentation,with splitting cracks occurring at different locations within the specimen.The compressive strength of both overlapping ice and single-layer ice increases first and then decreases with the strain rate,reaching its maximum near a strain rate of 10^(-3)/s.The experimental results indicate that the uniaxial compressive strength of rafted ice is generally lower than that of single-layer ice under the same conditions,with its strength being 0.69 to 0.83 times that of single-layer ice.This study provides important theoretical references for understanding the mechanical behavior of rafted ice and for designing ice-resistant structures.
作者
李伟
徐滢
申辰
李育凝
吴宽宽
王国军
张大勇
LI Wei;XU Ying;SHEN Chen;LI Yuning;WU Kuankuan;WANG Guojun;ZHANG Dayong(CNOOC Research Institute Ltd.,Beijing 100010,China;School of Chemical Engineering,Ocean and Life Sciences,Dalian University of Technology,Panjin 124221,China)
出处
《海洋环境科学》
北大核心
2025年第4期524-533,共10页
Marine Environmental Science
基金
国家自然科学基金项目(52071055)
中国海洋石油有限公司科技课题:“海冰环境及固定平台结构抗冰关键技术研究(KJZH-2023-2402)”。
关键词
重叠冰
单轴压缩强度
破坏模式
应变速率
室内测试
rafted ice
uniaxial compressive strength
failure modes
strain rate
experiments testing
