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• W4385576225 abstract "Unsteady internal water pressure (UIWP), such as water hammer and mass oscillation (rigid column effects) induced by load regulation of hydropower plants arranged with surge tanks, leads to crack damage and structural instability in hydropower tunnels. In this study, an analytical model for the propagation of UIWP along the cracks in hydropower tunnel walls was developed by analytically solving the one-dimensional (1D) unsteady seepage flow equation in a cylindrical coordinate system. The analytical solution, which was validated to be in good agreement with prototype monitoring data, was then applied to an engineering case to investigate the propagation characteristics of UIWP along the cracks in the tunnel wall. UIWP was found to be attenuated along the propagation direction because of the flow resistance, indicating that the surface layer of the tunnel wall may be more vulnerable to UIWP. Moreover, the maximum propagation depth of mass oscillation was greater than the water hammer. Time lag occurred and resulted in an additional seepage force on the inner layers of cracks, referred to as hydraulic impact, which was expected to be one of the main drivers of instability in the tunnel structure. The hydraulic impact became more pronounced with the increase in period and amplitude. Based on the comprehensive comparison of the propagation characteristics between water hammer and mass oscillation, mass oscillation is concluded to have a more significant influence on structural damage than water hammer and, therefore, should receive more attention." @default.
• W4385576225 created "2023-08-05" @default.
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• W4385576225 date "2023-10-01" @default.
• W4385576225 modified "2023-10-11" @default.
• W4385576225 title "Analytical Model of Unsteady Internal Water Pressure Propagation along Cracks in Hydropower Tunnel Walls" @default.
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• W4385576225 doi "https://doi.org/10.1061/jhend8.hyeng-13567" @default.
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