The present damage situation of railway operation tunnels is very serious, sometimes they even threaten the traffic safety of the trains passing through the tunnel.
目前铁路运营隧道病害状况严重，有些已达到了威胁铁路行车安全的程度。
Studying the long tunnel geometric design from its actual operation is the issue should be paid close attention in railway design.
从运行角度对长大隧道设计进行专题分析是铁路设计工作中需要重点关注的课题。
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