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1)  "zero"digging method
"零"进洞工法
2)  zero depth at entrance
零埋深进洞
1.
Based on the right line project of Yangjiawan Tunnel of Zhashui-Xiaohe Express Highway,in view of the characteristics of the heavily weathered surrounding rock at the entrance,such as jointing,crack,broken mass and low stability,this paper brings forward the concept "zero depth at entrance",or "zero excavation".
依托柞水至小河高速公路杨家湾隧道右线工程,针对隧道入口处围岩为强风化板岩,节理、裂隙发育、岩体破碎、围岩稳定性差等特点,提出"零埋深进洞",即"零开挖"的设计、施工理念。
3)  tunnel-entering construction
进洞施工
1.
This paper introduces the general situation of the engineering of Dafengkou Tunnel, and expounds in detail the technical points of the tunnel-entering construction.
介绍了大风口隧道的工程概况,详细阐述了进洞施工的技术要点。
4)  three heading method
三导洞工法
5)  central heading method
中导洞工法
6)  construction with middle tunnel method
中洞法施工
补充资料:洞庭送李十二赴零陵
【诗文】:
今日相逢落叶前,洞庭秋水远连天。
共说金华旧游处,回看北斗欲潸然。



【注释】:



【出处】:
全唐诗:卷235_34
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