List of products by author: E. M. A. Arias

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  Skewed Tunnel Portal Design

  Abstract: Geometrical alignment conditions as well as topography restrictions lead to portal designs which do not necessarily intersect the ground in a desired perpendicular angle. Lack of portal design guidelines and a vague understanding on the rock mass yields, as a consequence, conservative (heavy/stiff support) portal designs, complex construction procedures, longer construction time and a...

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