Study on the freezing characteristics of silty clay under high loading conditions

被引：17

作者：

Guan, Hui ^{[1
]}

Wang, Dayan ^{[1
]}

Ma, Wei ^{[1
]}

Mu, Yanhu ^{[1
]}

Wen, Zhi ^{[1
]}

Gu, Tongxin ^{[1
]}

Wang, Yongtao ^{[1
]}

机构：

[1] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China

来源：

COLD REGIONS SCIENCE AND TECHNOLOGY | 2015年 / 110卷

基金：

中国国家自然科学基金;

关键词：

Freezing characteristics; Silty clay; High loading conditions; Water migration; Freezing front; FROST HEAVE; SEGREGATION; MIGRATION; MECHANISM; SOILS;

D O I：

10.1016/j.coldregions.2014.10.005

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The freezing behaviour of soil in deep alluvium is one of the important issues in artificial freezing engineering. In this paper, an apparatus was developed for studying the freezing characteristics of soil under high loading conditions and the related test procedures were also suggested. Based on this apparatus, a series of one-dimensional freezing tests were also carried out on silty clay under various loading conditions and pseudo temperature gradients. The results show that all soil samples exhibit compression under high loading conditions, and it consists of four stages in which the strain rate is I) very low, II) rapidly increasing, III) decaying and IV) relatively constant. During freezing tests, the freezing front moves downward rapidly during the initial period, and it tends to be stable after 10 h. As the increase of axial load or pseudo temperature gradient, the freezing front moves downward more quickly and lies closer to the warm end at the thermostatic stage. Even under high loading conditions, there is an obvious water redistribution phenomenon, which shows that the water migrated to the frozen part and gathered at the freezing front in the soil sample under the existence of a pseudo temperature gradient. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：26 / 31

页数：6

共 30 条

[1] EXPERIMENTAL-STUDY OF FROZEN FRINGE CHARACTERISTICS [J].