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- W2372223622 abstract "The non-dimensional governing equations for natural convection in variable permeability porous media are derived. Triggering and evolution of winter-time natural convection cooling effect in fractured-rock revetment embankments of the Qinghai-Tibet Railway are investigated by means of an air-flow function. In order to evaluate the effectiveness of the cooling effect of winter-time natural convection in railway embankment with fractured-rock revetment, the mean Nusselt number representing heat transfer through unit length at the base of embankment is defined. The dependences of the average Nusselt number on the thickness of fractured-rock layer and temperature amplitude of embankment surface are analyzed using a numerical representation of the non-dimensional governing equations for heat convection. The analysis shows that the mean Nusselt number in fractured-rock revetment embankments decreases early and then increases with increasing of the temperature amplitude on the surface instead of increasing monotonically. This decrease-increase effect during increasing of the mean Nusselt number will rapidly weaken with increasing of the temperature amplitude. The approach to evaluation of the critical thickness of fractured-rock layer in revetment embankments is developed on the basis of the decrease-increase effect. Validity of estimating the fractured-rock revetment layer thickness in the railway embankment is demonstrated both numerically and experimentally. Therefore, this evaluation approach in the present work is available for construction of the Qinghai-Tibet Railway." @default.
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- W2372223622 date "2005-01-01" @default.
- W2372223622 modified "2023-09-26" @default.
- W2372223622 title "Study on Thickness of Qinghai-Tibet Railway Fractured-rock Revetment Layer on the Basis of Convection Cooling Effect" @default.
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