Evolution Laws of Mechanical Properties of Artificially Frozen Silty Clay

被引：1
|
作者：
Wang T. [1 ,2 ]
Wang H. [1 ,2 ]
Song H. [3 ]
Wang O. [4 ]
Liu J. [1 ,2 ]
机构：
[1] School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei
[2] Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei
[3] School of Civil Engineering, Beijing Jiaotong University, Beijing
[4] School of Civil Engineering, Hebei University of Engineering, Handan, 056038, Hebei
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2019年 / 40卷 / 01期
关键词：
Artificial freezing method; Freezing temperature; Frost heave deformation; Shear strength; Silty clay; Subway engineering;
D O I：
10.3969/j.issn.1001-4632.2019.01.01
中图分类号：
学科分类号：
摘要：
Motivated by the application and development of artificial freezing method in subway engineering, with the silty clay layer as the research object, the evolution laws for the strength and frost heave deformation of artificially frozen silty clay affected by such factors as freezing temperature, moisture content and confining pressure were deeply studied through laboratory tests. Results indicate that the freezing temperature, moisture content, and confining pressure significantly affect the growing trend and failure mode of stress-strain curves. The relevance of the triaxial shear strength and elastic modulus with the freezing temperature, moisture content and confining pressure presents different evolution trends due to the coupling effects of the three. Under unidirectional freezing mode, the frost heave deformation of artificially frozen silty clay reaches the maximum once the temperature field reaches a constant temperature gradient. There is a better linear regression relationship between frost heave ratio and freezing temperature. Moreover, the frost heave ratio of silty clay under the condition of external water supply is much greater than that under the closed condition without water supply. In the engineering practice of artificial ground freezing technology, freezing temperature, moisture content and the buried depth of strata are the three indicators for ensuring the design strength of freezing wall, controlling surface deformation and preventing structure from fracture, water seepage or mud leakage. © 2019, Editorial Department of China Railway Science. All right reserved.
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页码：1 / 7
页数：6
相关论文
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