extra long tunnel 特长隧道
Qinling extra long tunnel 秦岭特长隧道
extra-long tunnel under construction 在建特长隧道
extra-long perforation tunnel 特长射孔孔道
extra-long railway tunnel 特长铁路隧道
extra long highway tunnel 特长公路隧道
extra-long highway tunnel 特长公路隧道
With the increase of extra-long tunnel construction, obviously, the empirical value can not keep up with the actual. So it needs to work out a method for natural wind computation.
随着特长隧道建设工程的增多，经验取值显然与实际不符，有必要建立一套隧道内自然风计算方法。
Taking Changjiang tunnel project in Shanghai as the background, this presentation systematically describes critical techniques of structure design on super large, extra long tunnel.
本报告以上海长江隧道为工程背景，系统地阐述了超大特长隧道结构设计的关键技术。
The accident emergency rescue of extra long highway tunnel has become a focus in tunnel operation.
特长公路隧道的安全应急管理研究，已成为隧道工程中迫切需要解决的课题。
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