Distribution of Soil Temperature Field Close to Tunnel End and Optimization of Segment Insulation Measures in Cross-Passage Construction by Artificial Ground Freezing Method

被引：1
|
作者：
Zhang S. [1 ,2 ,3 ]
Yue Z. [4 ]
Zhang J. [3 ,5 ]
Sun T. [1 ]
Wang L. [3 ]
机构：
[1] School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei
[2] Key Laboratory of Roads and Railway Engineering Safety Control, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei
[3] Freeze and Rail Transit Engineering Branch, Beijing China Coal Mine Engineering Co., Ltd., Beijing
[4] Graduate School, Shijiazhuang Tiedao University, Shijiazhuang, 050043, Hebei
[5] Institute of Mine Construction, China Coal Research Institute, Beijing
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2020年 / 41卷 / 03期
关键词：
Artificial ground freezing method; Cross-passage in tunnel; Heat dissipation of segment; Soil temperature field; Spacing of freezing pipes;
D O I：
10.3969/j.issn.1001-4632.2020.03.11
中图分类号：
学科分类号：
摘要：
In order to study the distribution of soil temperature field close to the tunnel end and the influence of segment heat dissipation on the soil temperature field in tunnel cross-passage construction by artificial ground freezing (AGF) method, the distribution of soil temperature field, the thickness of frozen wall and the measures of segment insulation were analyzed by adopting the methods of field measurement and numerical calculation. Results show that the soil temperature and the expanded thickness of frozen wall change exponentially with the increase of the depth. When the depth is greater than 2.2 m, the thickness of frozen wall and the temperature field of frozen soil are basically stable. The frozen wall of the cross-passage can be divided into 2 parts along the length direction: the interface sections on 2 sides and the normal freezing section. The spacing of freezing pipes is one of the important factors for the thickness of the frozen wall at the interface section. Therefore, the frozen wall in the auxiliary frozen surface is one of the main risk points in the construction of cross-passage. The influence range of the heat dissipation of segment on soil is logarithmic with the freezing time. With the extension of freezing time, the scope of influence will gradually expand. The freezing effect of the interface area can be ensured by adding a 5 cm sandwich insulation layer in the inner side of the steel segment near the soil mass or by improving the grouting material behind the segment wall. After optimization, the thickness of the frozen wall close to the segment in the interface section can be increased by about 24%. © 2020, Editorial Department of China Railway Science. All right reserved.
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页码：95 / 102
页数：7
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