Small variation of annual temperature in deep tunnel can produce annual variation in tilt and strain |
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| Authors: | Yu-jun Sun Jie Li Jian ling Cao Shuang-ling Lu and Yao lin Shi |
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| Institution: | (1) Laboratory of Computational Geodynamics, Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China;(2) Earthquake Administration of Shandong Province, Ji’nan, 250014, China;(3) The Standard Seismic Station of Taian, Taian, 271600, China |
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| Abstract: | In this paper, finite element method (FEM) of axisymmetric linear elastic model has been used to calculate the tilt and strain
induced by small annual temperature variations in a deep tunnel. The results show that even if the amplitude of the annual
variation meets the construction standard of seismic station issued by China Earthquake Administration (the annual temperature
variation amplitude in the tunnel is no more than 0.5 °C), a small annual temperature variation of amplitude just 0.2 °C in
the tunnel would produce 10−7 rad changes in tilt and 10−7 changes in strain. Especially, at the end and the corner of the tunnel, changes of tilt and strain can be even larger. Therefore,
in the future, it is an important task to reduce the annual temperature variation in the tunnel as far as possible. Within
the tunnel, for both baseline instrument and pendulum instrument, the modeling suggests ways of construction of the tunnel
and installation of the instrument to decrease the influence of the annual temperature variation.
Foundation item: China Earthquake Administration Sector Fund (2008419077) and Knowledge Innovation Program of the Chinese Academy of Sciences
(kzcx2-yw-123). |
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| Keywords: | finite element method (FEM) tilt strain annual variation |
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