The coupled moisture-heat process of a water-conveyance tunnel constructed by artificial ground freezing method

被引:31
作者
Li, Ming [1 ]
Ma, Qinguo [2 ,3 ]
Luo, Xiaoxiao [2 ,3 ]
Jiang, Haiqiang [2 ]
Li, Yongdong [2 ]
机构
[1] Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou 730070, Peoples R China
[2] South China Univ Technol, State Key Lab Subtrop Bldg Sci, Guangzhou 510641, Guangdong, Peoples R China
[3] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China
基金
中国国家自然科学基金;
关键词
Artificial freezing method; Moisture-heat process; Frozen wall; Closure time; Influencing factor; MASS-TRANSFER; PIPE-ROOF; TEMPERATURE; MODEL; SOIL; WALL;
D O I
10.1016/j.coldregions.2020.103197
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Artificial freezing ground method is widely applied in adverse geotechnical engineering conditions to improve the strength and reduce permeability of soil. It is a challenge to ascertain the progression of frozen wall and analyze the arrangement of freezing pipes due to the complexity of freezing process involving ice-water phase change and water migration. To analyze the progression of frozen wall and its influencing factors, a hydro-thermo coupling model is established, and a water-conveyance tunnel constructed by artificial freezing method is carried out. The results show that: (1) Water migration and ice-water phase transition have significant influences on temperature distribution, and their effects should not be neglected. (2) The thickness of frozen wall with temperature lower than 10 degrees C has attained the required design value at the end of active freezing. Meantime, under drive of temperature gradient, water migrates and redistributes. (3) The interval angle for two adjacent pipes is the main influencing factor on progression of frozen wall, followed by the freezing pipe diameter and horizontal spacing. Additionally, for coarse-grained soil, the influence of seepage on development of frozen wall is significant. This study will provide a theoretical reference for frozen wall design.
引用
收藏
页数:10
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