Design code and key technical points for main tunnel and parallel heading of East Qinling Super-long Tunnel are introduced.
介绍东秦岭特长隧道工程正洞及平行导坑的设计标准、施工技术要点。
The accident started with a gas leak that let gas pour into the main tunnel and trigger an explosion due to poor ventilation.
事故由瓦斯泄露引起，在通风不畅的情形下，瓦斯涌入主要通道，引发了爆炸。
A description is given to construction methods and characteristics of construction management of service gallery and main tunnel.
介绍辅助坑道及正洞的施工方法和施工管理特点。
A description is given to construction methods and characteristics of construction management of service gallery and main tunnel.
介绍辅助坑道及正洞的施工方法和施工管理特点。
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