| 从团粒结构失稳角度探讨由灌溉引起的黄土湿陷发生机理 |
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| 引用本文： | 郭玉文,加藤诚.从团粒结构失稳角度探讨由灌溉引起的黄土湿陷发生机理[J].兰州大学学报(自然科学版),2007,43(5):6-10. |
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| 作者姓名： | 郭玉文 加藤诚 |
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| 作者单位： | 1. 中国环境科学研究院,北京 100012;东京农工大学,日本 东京 183-0051
2. 东京农工大学,日本 东京 183-0051 |
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| 基金项目： | 致谢：本文得到甘肃省科学院地质自然灾害研究所曾思伟研究员、王德楷研究员,兰州大学苗天德教授,日本东京农工大学铃木创三教授、田中治夫博士等的很多帮助和指导,在此一并致谢. |
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| 摘 要： | 利用SEM/EDX等测试手段,探讨了由灌溉引起的黄土湿陷发生机理.结果表明:黄土湿陷过程包括初始快速变形和后续迟缓变形2个阶段,这2个阶段的发生都与黄土的骨架颗粒--团粒有关.前者是由于黄土中非水稳性团粒遇水破坏所至,而后者是因为水的渗透造成黄土团粒主要胶结物碳酸钙的淋溶移动损失,从而导致失稳.黄土中松散结构或架空孔隙的存在是产生湿陷的重要条件,但不是湿陷发生的根本原因.
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| 关 键 词： | 黄土 湿陷 团粒 碳酸钙 骨架颗粒 |
| 文章编号： | 0455-2059（2007）05-0006-05 |
| 修稿时间： | 2007-01-042007-04-26 |
Discussion on the mechanism of loess collapsibility caused by irrigation from the aggregates stability-losing angle |
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| GUO Yu-wen,KATO Makoto.Discussion on the mechanism of loess collapsibility caused by irrigation from the aggregates stability-losing angle[J].Journal of Lanzhou University(Natural Science),2007,43(5):6-10. |
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| Authors: | GUO Yu-wen KATO Makoto |
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| Institution: | 1. Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 2. Tokyo University of Agriculture and Technology, Tokyo 183-0051, Japan |
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| Abstract: | The SEM/EDX methods are used in this article to discuss the mechanism of the loess collapsibility caused by irrigation and the result shows that there are two phases during the process of the loess collapsibility, i.e. the initial rapid deformation and the follow-up tardy deformation. The two phases correlate with the aggregates-framework grain of the loess. The first phase is caused by the destruction that occurs when nonwatery stable aggregates encounter watery aggregates and the second is induced by the leaching loss and movement of the main cement the CaC03 of the loess aggregates caused by water infiltration. The loose structure or pore of the loess is an important condition in causing collapsibility, but not a fundamental reason for this process. |
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| Keywords: | loess collapsibility aggregate CaCO3 framework grain |
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