北极点及高纬度海域海冰压缩强度的试验研究
EXPERIMENTAL STUDY ON COMPRESSIVE STRENGTH OF SEA ICE IN THE NORTH POLE AND HIGH ARCTIC
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摘要: 在中国第十三次北极科学考察过程中, 我国科考队首次乘破冰船抵达北极点并开展了海冰采集与物理力学性质测试, 填补了我国在该海域海冰试验数据的空白. 同时, 为研究采样地点气候条件对海冰压缩强度及物理性质的影响, 分别在81°N ~ 87.3°N之间的其他6个站位开展了冰样采集与试验测试. 为研究孔隙率与卤水体积对压缩强度的影响, 测量了试样的盐度、温度与密度等物理性质. 数据显示, 处于纬度较低海域的海冰试样, 其盐度与密度沿竖向剖面并无明显的变化规律, 冰层表层与底层的压缩强度较为接近; 而北极点海域的海冰物理参数沿冰厚方向的分布具有一定的规律性, 并且压缩强度沿剖面方向的变化也较为显著. 试验结果表明, 不同海域的环境条件对海冰单轴压缩强度具有显著影响, 即使在融冰期末期北极点海冰也并未完全处于融化状态, 其底层海冰仍保留了部分结冰期海冰的特点, 因此强度也明显高于完全处于融化状态的海冰. 此外, 也分析了运输过程对海冰物理力学性质的影响, 在严格的低温运输与存储条件下现场与实验室的测试结果并无明显差异.Abstract: During China’s 13th Arctic Scientific Expedition, the research team reached the North Pole for the first time via icebreaker and conducted sea ice sampling and physical-mechanical property tests, filling a gap in China’s experimental data for this region. To investigate the influence of climatic conditions on sea ice compressive strength and physical properties, ice samples were collected and tested at six additional stations between 81°N and 87.3°N. The salinity, temperature, and density of the samples were measured to analyze the effects of porosity and brine volume on compressive strength. The data revealed that for sea ice from lower latitudes, salinity and density showed no clear variation along vertical profiles, and the compressive strengths of surface and bottom layers were similar. In contrast, sea ice at the North Pole exhibited distinct patterns in physical parameters along the vertical direction, with compressive strength varying significantly across the profile. The results demonstrate that environmental conditions significantly affect the uniaxial compressive strength of sea ice. Even during the end of melting season, the sea ice at North Pole’s was not entirely in a melted state; the bottom layer retained characteristics of freezing-period ice, resulting in notably higher strength than fully melted ice. Additionally, this study analyzed the impact of transportation on sea ice’s physical-mechanical properties. Under strict low-temperature storage and transport conditions, field and laboratory test results showed no significant differences.