A BASIC STUDY OF FREEZING-THAWING DISASTER AND ITS PREVENTION TECHNOLOGY

冻融灾害及其防治技术基础研究

• 批准号: 12680468
• 负责人: ITO Kakeshi
• 金额: $ 2.24万
• 依托单位: Akita National college of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12680468/
• 关键词: Field observation; Freezing-thawing phenomenon; Freezing index; Time series analysis; Spectrum analysis; Regionality; 路床土の室内実験; 時系列変動

This research project aims to investigate the characteristics of freezing indices and regional disasters related to freezing-thawing phenomena in snowy and cold regions in Japan. For this purpose, field test apparatus was installed at the site of public road to observe the variations of underground temperature through the year, then the laboratory testings of the soil samples used for new building road were carried out to distinguish the geomaterials for preventing freezing-thawing henomena. On the other side, various kind of winter meteorological data were collected and analysed. From the data analyses, several new information were obtained as follows : (1) Freezing index is getting lower in recent years. This phenomenon corresponds to the recent warming winter tendency that was verified by this research in analyzing the time series data. (2)Winter temperature is getting higher within the recent half century, that is, 3℃ up in Sapporo, 1.5℃ up in Akita, and 1.5℃ up in Fukui. In this way, warming winter tendency was recognized clearly in high latitude. (3) According to the spectrum analysis of daily minimum air temperatures, superior periodicity was found as 11- year in Sapporo, and 9- year at the basin areas in Honshu island. (4)Freezing indices distribution map of Tohoku district was made for the winter of 2000/2001. We found a new relationship between the freezing index, elevation from the sea level, and freezing depth. In which, each prefecture has an independent coefficient of the distribution equation. However, proposed equation on freezing index was not followed well especially in the heavy snow cover areas because of its effectiveness of snow insulation.

本研究项目旨在调查日本多雪和寒冷地区与冻融现象有关的冰冻指数和区域性灾害的特征。为此，在公共道路现场安装了现场测试设备，观测地下温度的全年变化，然后对新建道路使用的土样进行室内测试，以区分防止冻融现象的岩土材料。另一方面，收集了各类冬季气象资料，并进行了分析。通过对数据的分析，获得了以下几个新的信息：(1)近年来冻结指数呈下降趋势。这一现象与本研究在时间序列数据分析中证实的近期冬季变暖趋势相吻合。(2)近半个世纪以来，冬季气温呈上升趋势，札幌市上升3℃，秋田市上升1.5℃，福井市上升1.5℃。由此可以清楚地认识到高纬度地区冬季变暖的趋势。(3)日最低气温谱分析表明，札幌市的最低气温周期为11年，本州岛流域为9年。(4)绘制了东北地区2000/2001年冬季冰冻指数分布图。我们发现了冰冻指数、海平面高度和冰冻深度之间的新关系。其中，每个县都有一个独立的系数分布方程。然而，所提出的冰冻指数公式因其具有良好的隔雪效果而没有得到很好的遵循，特别是在大雪覆盖地区。

项目成果

伊藤 驍他: "凍結・融解繰返し現象とその地域特性に関する基礎的研究"国立秋田高専寒冷センター年報. 第14号. 7-14 (2001)

伊藤等：“反复冻融现象及其区域特征的基础研究”秋田国立工业大学低温中心年报第14号7-14（2001年）。

ITO Takeshi: "Strain softening of unsaturated swelling clay."Clay Science for Engineering, Vol. 1, Balkema. Vol.1. 137-142 (2001)

伊藤武：“不饱和膨胀粘土的应变软化。”工程粘土科学，卷。

ITO Takeshi et al: "A basic study of freezing-thawing frequency and its regional characteristics (in Japanese)."Research Reorts of The Institute for Cold Regions Technology, Akita National College of Technology. No.14. 7-14 (2001)

伊藤毅等：“冻融频率及其区域特征的基础研究（日文）”，秋田工业大学寒地技术研究所的研究报告。

ITO Takeshi: "Snowcover and Snowfall in 2000/2001 year winter (in Japanese)."Jr. of the Japanese Society for Snow Engineering. Vol.15, No.3. 210-211 (2001)

伊藤武：“2000/2001 年冬季的积雪和降雪（日语）”。

ITO Takeshi: "Strain softening of unsaturated swelling clay"Clay science for engineering. 1. 137-142 (2001)

伊藤武：“不饱和膨胀粘土的应变软化”工程粘土科学。