Influence of seasonal melt layer depth on the stability of surrounding rock in permafrost regions based on the measurement

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• 作者：Shiwei Shen (1) (2)
  Caichu Xia (1)
  Jihui Huang (1)
  Yan Li (3)
  
  1. Department of Geotechnical Engineering ; Civil Engineering College ; Tongji University ; Shanghai ; 200092 ; China
  2. College of Construction Engineering ; Jilin University ; Changchun ; 130026 ; Jilin ; China
  3. Electric Power Design and Research Institute of Guangdong Province ; Guangzhou ; 510663 ; Guangdong ; China
  
• 关键词：Tunnel ; Permafrost region ; Temperature monitoring ; Depth of seasonal melt layer ; Stability of surrounding rock
• 刊名：Natural Hazards
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：75
• 期：3
• 页码：2545-2557
• 全文大小：568 KB
• 参考文献：1. Bonacina C, Comini G, Fasano A et al (1973) Numerical solution of phase change problems. Int J Heat Mass Transf 16(6):1852鈥?882
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  5. Jia X, Li W, Zhu Y (2005) Analysis of stability for surrounding rock caused by depth of thawing range during plateau permafrost tunnel construction. Chin J Rock Mech Eng 24(supp. 2):5693鈥?697
  6. Li Y (2013) Study on the technique of controlling surrounding rock thawing depth and the law of tunnel lining deterioration. Shanghai: Tongji University, Master Thesis
  7. Shamsundar N (1982) Formulae for freezing outside a circular tube with axial variation of coolant temperature. Int J Heat Mass Transf 25(10):1614鈥?616 CrossRef
  8. Sheng Z (2011) Analysis on thawing cylinder depth鈥檚 influence on the tunnel stability with several-year Frozen earth. Railw Constr Technol 2:35鈥?8
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  11. Zhang X, Lai Y, Yang F et al (2002) Numerical analysis on freezing鈥搕hawing situation of tunnel鈥檚 surrounding rock in cold regions. J China Railw Soc 24(4):92鈥?6
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Hydrogeology
  Geophysics and Geodesy
  Geotechnical Engineering
  Civil Engineering
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-0840

文摘

During tunnel construction in permafrost regions, control of the temperature field and depth of the seasonal melt layer of surrounding rock are the key factors that determine the stability of surrounding rock and the security of a structure. Based on the monitoring data on the temperature of the surrounding rock at two sections of Jiangluling Tunnel, the distribution regularities of the temperature field of the surrounding rock in different depths from the tunnel wall are obtained. These findings are used to determine the changing rules of the depth as well as the increasing speed of the depth of seasonal melt layer with time. At the same time, the influence of the surface of the accumulated temperature of surrounding rock to seasonal melt layer is analyzed, and the influence of the rule of the depth of seasonal melt layer on the stability of surrounding rock and arch crown settlement is determined. Results show that the temperature of the surrounding rock and the depth of the seasonal melt layer are controlled by engineering geological conditions of the surrounding rock and the temperature inside the tunnel. The temperature of the surrounding rock decreases with the increase in depth from the tunnel wall. Correspondingly, the depth of seasonal melt layer increases along with the temperature inside the tunnel. It is a positive correlation between seasonal melt layer and the surface of the accumulated temperature of surrounding rock, and with the increase in the depth of seasonal melt layer, the arch crown settlement increases, whereas the stability of the surrounding rock decreases.