| 利用图像数字化技术分析冻结缘特征 |
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| 引用本文： | 李萍,徐学祖.利用图像数字化技术分析冻结缘特征[J].冰川冻土,1999,21(2):175-180. |
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| 作者姓名： | 李萍 徐学祖 |
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| 作者单位： | 中国科学院兰州冰川冻土研究所冻土工程国家重点实验室!兰州，730000，中国科学院兰州冰川冻土研究所冻土工程国家重点实验室!兰州，730000，中国科学院兰州冰川冻土研究所冻土工程国家重点实验室!兰州，730000，中国科学院兰州冰川冻土研究所冻土工程国家重点实验室!兰州，730000，中 |
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| 摘 要： | 以开放系统饱水正冻土为研究对象，作不同土质和不同初始条件下的单向冻结实验。实验结束后立刻对试样做复形膜。随后将复形膜进行图像数字化处理，可反演分析冻结缘和冰分凝形成的时间、厚度、位置及冻结缘导湿系数。结果表明，图像数字化技术具有较高的分析精度和准确性，是一种实用的创新研究方法；在给定的试验条件下，冰分凝速度随试验持续时间呈幂函数形式减小。冰分凝温度在试验初期随冻深快速推移而降低，随后由于冻土段长度
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| 关 键 词： | 冻结缘 图像数字化技术 冰分凝 导湿系数 冻土 |
Analyses of Characteristics of Frozen Fringe by Using the Digital Technique of Picture |
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| LI Ping, XU Xiaozu ,PU Yibin, WANG Jiacheng ,TAO Zhaoxiang, WANG Yujie.Analyses of Characteristics of Frozen Fringe by Using the Digital Technique of Picture[J].Journal of Glaciology and Geocryology,1999,21(2):175-180. |
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| Authors: | LI Ping XU Xiaozu PU Yibin WANG Jiacheng TAO Zhaoxiang WANG Yujie |
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| Abstract: | Unidirectional freezing tests with saturated soil in an open system were conducted under different initial and boundary conditions in the laboratory. The digital technique of picture is considered able to obtain the real record of thickness of frozen fringe and ice segregation during soil freezing. Duplicated films were mad and the digital technique of picture was used after tests. According to amount of frost heaving and picture disPOsal, time of initiation, position,and thickness of frozen fringe and individual ice lens as well as hydraulic conductivity of frozen fringe can be obtained.The results of picturial analyses show that the digital technique of picture has heigh analytical precision and can avoid low efficiency and visual fatigue as compared with separated layers by manual work. So this technique is a practical and a new research method.Under the given test conditions, the velocity of ice segregation decreases in POwer form with elapsed time. The temperature of ice segregation decreases with frost depth quickly advancing in the initial stage of tests, and then increases and stabilizes as result of reduced temperature gradient with increasing the length of frozen section. The hydraulic conductivity of frozen fringe decreases in exponential form with elapsed time. |
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| Keywords: | frozen fringe digital technique of picture ice segregation hydraulic conductivity |
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