Eight have died since construction of the new tunnel began 15 years ago, blasting and boring through 13 million cubic meters of rockin hot and humid conditions.
The interaction of stress wave with tunnel structures inrock mass is a complex problem, which up to now has not been solved completely.
应力波与隧道衬砌的相互作用问题为岩石力学的一个十分复杂的问题，到目前为止还没有得到圆满的解决。
3
And reach a conclusion in the tunnel and stability of the surrounding rock, rock deformation, stress distribution, economic and technical aspects of security.