工程的最大难点在于深埋长隧洞的勘察、设计与施工。
The most complicated part of the project belongs to the design and construction of these long tunnels at great depths.
地应力和地下水问题对深埋长隧洞衬砌的设计及施工具有重大影响。
In-situ stress and groundwater have important influences upon the design and construction of the lining for deep and long tunnels.
第一期工程方案的关键技术就是如何开凿深埋长隧洞，掘进机的采用使得这一问题得到解决。
The key technology of the first stage project is how to dig tunnels and this is to be solved by adopting excavators.
第一期工程方案的关键技术就是如何开凿深埋长隧洞，掘进机的采用使得这一问题得到解决。
The key technology of the first stage project is how to dig tunnels and this is to be solved by adopting excavators.
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