Horseshoe section tunnel is a common type in the free-flow tunnel. There is no analytical expression to solve the critical depth of horseshoe section tunnel under free flow. The traditional solving methods,such as trial method and chart method,are very complicated with low precision. In this study,by mathematical transformation of critical flow equation of horseshoe section tunnel,the relationship between the dimensionless parameters and relative critical depth was analyzed and simulated. Using the gradual ...
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