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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2009  >  9(1): 67-72
LI Shuang-yang, ZHANG Ming-yi, HUANG Zhi-jun, DONG Yuan-hong. Numerical analysis of moisture, thermal and mechanical states for subway double-line tunnel constructed by artificial freezing method[J]. Journal of Traffic and Transportation Engineering, 2009, 9(1): 67-72. doi: 10.19818/j.cnki.1671-1637.2009.01.014
Citation: LI Shuang-yang, ZHANG Ming-yi, HUANG Zhi-jun, DONG Yuan-hong. Numerical analysis of moisture, thermal and mechanical states for subway double-line tunnel constructed by artificial freezing method[J]. Journal of Traffic and Transportation Engineering, 2009, 9(1): 67-72. doi: 10.19818/j.cnki.1671-1637.2009.01.014
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Numerical analysis of moisture, thermal and mechanical states for subway double-line tunnel constructed by artificial freezing method

doi: 10.19818/j.cnki.1671-1637.2009.01.014

  • State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China

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  • Author Bio:

    LI Shuang-yang(1980-), male, assistant researche r, PhD, +86-931-4967296, li.shuangyang@163.com

  • Received Date: 2008-09-12
  • Publish Date: 2009-02-25
    Abstract
  • In order to accurately analyze the thermal and mechanical states of subway tunnel constructed by artificial freezing method, the coupled effects of moisture transfer and phase change of ice and water, the generation of cement hydration heat and thermal creep constitutive relationship were taken into account, and a moisture, thermal and mechanical coupled model was established. The thermal and mechanical states of Guangzhou subway double-line tunnel constructed by artificial freezing method were simulated, and the safety of frozen wall was evaluated by using the long-term strength of frozen soil. Analysis result shows that the maximum principal stress distributes circularly along freezing pipes when the subway tunnel is constructed by artificial freezing method, and the stress around freezing pipes is obviously high. Excavation has little influence on circular stress field, the surface settlement caused by artificial freezing construction doesn't increase with excavation expansion, which is different from other construction methods. The maximum settlement is only 9.1 mm during the whole construction, so the surface settlement can be effectively controlled by artificial freezing method.

     

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