For this purpose the mechanism of forming a rock tunnelroof arch and reinforcement will be illustrated with the underground powerhouse in the Three Gorges Project.
为此，以三峡工程地下厂房拱顶设计为例，研究洞顶岩石拱结构形成及加固机理。
2
Because the first caving of work face haven't been finished, the tunnelroof and hole can not be used and gas often goes beyond the limit, so some measures must be taken.
Though the load analysis on the tunnelroof wall-rock in the fault footwall tunnel, this paper solves the problem of the tunnel support of tunneling through the great fault;