Small variation of annual temperature in deep tunnel can produce annual variation in tilt and strain

• 来源期刊: 地震学报（英文版）
• 学科: 地球科学
• 年，卷（期）: 2008,（5）
• 页码范围: 464-473
• 页数: 10页
• 分类号: P315.72+7
• 语种: 英文
• DOI: 10.1007/s11589-008-0464-1

摘要

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 am-plitude of the annual vaxiation meets the construction standard of seismic station issued by China Earthquake Ad-ministration (the annual temperature variation amplitude in the tunnel is no more than 0.5℃), a small annual tem-perature variation of amplitude just 0.2℃ in the tunnel would produce 10-7 tad changes in tilt and 10-7changes in strain. Especially, at the end and the comer 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.