澜沧江源头科学探险考察中的冰川学考察 |
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引用本文: | 李洪升,岳前进,郑靖明,朱元林.澜沧江源头科学探险考察中的冰川学考察[J].冰川冻土,2000,22(1):5-6. |
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作者姓名: | 李洪升 岳前进 郑靖明 朱元林 |
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作者单位: | 中国科学院兰州冰川冻土研究所冰芯与寒区环境开放研究实验室!甘肃 兰州730000 |
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摘 要: |
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关 键 词: | 澜沧江原头 科学探险 考察 冰川学 |
China Scientific Expedition on Lancang River Source about Glaciology |
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Abstract: | Ice
force is dominant for the offshore struc- tures in ice covered region, and mechanical
properties of ice are the main factors to determine the ice forces. The mechanical
propeties of sea ice, a special solid ma- terial, depend on its crystal dimension, c-axes
direc- tion, anisotropy, temperature, stain-rate, stress-state and other factors. In the
previous studies, some experi- mental models of sea ice strength were established. In this
paper, sea ice strength was studied through a macroscopic and microscopic combination,
which has the benefit to establish the theoretic model, and to des- cribe the deformation
law, the stress-strain relation- ship and the destroy criteria. Based on the physical
process of ice-structure interaction, the mechanisms of formation and expansion of the
micro-crack were presented through the microscopic mechanism analy- sis of sea ice
ductile-brittle transition. The criterion of sea ice ductile-brittle transition was
obtained by ana- lyzing the Rice-Thomson model. The sea ice strength of the
ductile-brittle transition zone calculated was ac- corded with the test result, which can
be utilized to forecast the mechanical behaviors in the ice-structure interaction under
general conditions, and to be theo- retic foundation for the ice force design. |
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