DESIGN OF HORSESHOE-SHAPED TUNNELS USING THE ROUGH MODEL METHOD (RMM)

R. ZEGAIT, B. ACHOUR

Abstract


The uniform flow in a horseshoe-shaped tunnel is often encountered in many practical cases. This pipe can be used for water drainage in sewerage and construction. For the purpose of designing this type of channel with the presumption of uniform flow, it is necessary to refer to Chezy and Manning relationships. In general, Chezy's and Manning's coefficients are given as data of the problem and are mostly considered constants regardless of the normal flow depth. This is an approximation of the fact that the flow resistance should vary with depth or hydraulic radius. In this study, the pipe is designed with a variable flow resistance coefficient, depending on the fill rate of the pipe. The Chezy coefficient is no longer data of the problem but a variable to be determined. The determination of Chezy's coefficient is made possible by the rough model method (RMM). The proposed sizing method is valid in the entire turbulent flow domain, encompassing smooth, transitional, and rough turbulent flow regimes in a wide practical range.


Keywords


Uniform flow, Rough model method, Reynolds, Chezy's coefficient, Turbulent flow.

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References


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