Hydraulic Design of Unlined Rock Tunnels

by Carl J. Huval,

Serial Information: Journal of the Hydraulics Division, 1969, Vol. 95, Issue 4, Pg. 1235-1246

Document Type: Journal Paper


Unlined rock tunnel resistance coefficients can be predicted by using a rock overbreak parameter. The important considerations that enter in the design of unlined rock tunnels are summarized. It is found that the present method of prediction of hydraulic resistance is inadequate. A study of tunnel rock overbreak experience leads to a relation between rock overbreak and tunnel size. This measure of rock overbreak provides a simple correlation of flow resistance test results based on the fully rough flow equation.

Subject Headings: Rocks | Hydraulic design | Flow resistance | Tunnels | Load and resistance factor design | Flow measurement | Parameters (statistics) | Hydraulics

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