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The effect of step on the hydraulic characteristics of the subcritical free surface flow in conveyance tunnel
, Article Tunnelling and Underground Space Technology ; Volume 28, Issue 1 , 2012 , Pages 212-217 ; 08867798 (ISSN) ; Nabipour, M ; Sharif University of Technology
Abstract
Due to the water scarcity and uneven distribution of water resources, conveyance systems are designed to carry water through basins. For this purpose conveyance tunnels which carry supper/subcritical flows are commonly constructed. The occurrence of steps in the tunnels created by segment off-sets during the TBM operations would cause significant local head losses. As a result, the flow discharge may reduce. In this study subcritical free surface flow in conveyance tunnel is simulated using the one-dimensional HEC-RAS model. Impact of the invert segment off-set on the discharge rate is then estimated. Similarly a two-dimensional numerical model based on the Volume of Fluid (VOF) scheme is...
Numerical study of the effects of drainage systems on saturated/unsaturated seepage and stability of tailings dams
, Article Mine Water and the Environment ; Volume 36, Issue 3 , 2017 , Pages 341-355 ; 10259112 (ISSN) ; Nabipour, M ; Sharif University of Technology
Abstract
The stability of tailings dams is affected by seepage characteristics such as the location of the phreatic surface inside the dam, the effects of the capillary fringe, and the unsaturated zone above the zero pore pressure level. In this study, the performance of drainage systems in tailings dams was investigated by analyzing saturated and unsaturated seepage in the dam, considering the effects of the construction method, tailings properties, and the type of drainage systems. First, general seepage characteristics in tailings dams were studied and the effects of non-homogeneity were investigated. Our results show that in a silty tailings dam with a height of 15 m, unsaturated plus capillary...