The site is also serving as a test bed for an advanced design of tt5000 suitable for high ground water areas 我们把这里当作实验地，用来证明tt5000设计先进，能够用于高地下水位区域。
3.
Tunnel construction is very difficult hi region with high geotectonic stress and high subsurface water pressure . few deep - lying tunnels are constructed in civil conveyance and hydropower engineering up to now 特别是对在高地应力、高地下水位区域的隧洞建设，其施工难度更大，在国内的水利水电工程建设中并不多见。
