卤水体积和应变率影响下的渤海海冰单轴压缩强度分布  

Uniaxial compression strength distribution of sea ice in the Bohai Sea under the influences of brine volume and strain rate

作　　者：隋俊鹏[1] 李宝辉[1] 赵倩[1] 王兆宇 何帅康 付鹏博 何文全 SUI Jun-peng;LI Bao-hui;ZHAO Qian;WANG Zhao-yu;HE Shuai-kang;FU Peng-bo;HE Wen-quan(National Marine Environmental Forecasting Center,Beijing 100081 China;Marine Monitoring and Early Warning Center of Liaoning Province,Shenyang 110001 China;Dalian University of Technology,Dalian 116024 China;Marine Monitoring and Early Warning Center of Yingkou,Yingkou 115007 China)

机构地区：[1]国家海洋环境预报中心,北京100081 [2]辽宁省海洋预警监测中心,辽宁沈阳110001 [3]大连理工大学,辽宁大连116024 [4]营口市海洋预警监测中心,辽宁营口115007

出　　处：《海洋预报》2021年第4期38-44,共7页Marine Forecasts

基　　金：国家重点研发计划(SQ2018YFC140066、2016YFC1401502);国家自然科学基金(41676189)。

摘　　要：2018—2021年3个冬季期间在渤海辽东湾鲅鱼圈海域沿岸进行海冰单轴压缩试验。采用典型的柱状结构海冰作为试验对象,试验中加载方向垂直于柱状结构冰晶的轴向,应变率选取区间为4.5×10^(-5)~7.5×10^(-3)/s,海冰试样的温度在-3~-33℃之间。每组试验完成后对温度、盐度和密度进行了测量,用于计算每个试验试样的卤水体积。试验结果表明:海冰试样的应变-应力曲线表现出3种典型形式:韧性破坏、单峰值脆性破坏和多峰值脆性破坏。海冰名义压缩强度和卤水体积呈指数关系,应变率影响下的海冰单轴名义压缩强度出现韧性区-过渡区-脆性区的转化过程,在韧性区和脆性区阶段海冰的单轴名义压缩强度和应变率均呈幂函数关系。此外,综合卤水体积和应变率的影响,确定了海冰名义单轴压缩强度在两者共同影响下的变化规律。Uniaxial compression tests are carried out along the coast of Bayuquan sea area in the Bohai Sea during the winter seasons of 2018 to 2021.Considering the structure of,a typical columnar sea ice is used as the experimental samples in view of the mesostructure characteristics of natural formed ice.In the experiment,the loading direction is perpendicular to the main axis direction of the columnar ice crystal,the range of strain rate is between 4.5×10^(-5)~7.5×10^(-3)/s,and the temperature of sea ice samples is between-3~-33℃.The temperature,salinity and density are measured after each experiment to calculate the brine volume of each test sample.The results show that the strain-stress curve of sea ice samples reveals three typical forms,which are ductile failure,brittle failure with single peak and brittle failure with multiple peaks.The compression strength of sea ice has an exponential relationship with the brine volume.The uniaxial compression strength of sea ice under the influence of strain rate shows a transition process from ductile behavior to brittle behavior.The nominal uniaxial compression strength and the strain rate of sea ice in ductile and brittle modes are in a power function relationship.In addition,combining the effects of,the variation of sea ice nominal uniaxial compression strength under the under the combined influence of brine volume and strain rate is confirmed in this paper.

关 键 词：渤海 海冰 单轴压缩强度 卤水体积 应变率 

分 类 号：P731.15[天文地球—海洋科学]