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http://dx.doi.org/10.21729/ksds.2021.14.4.47

Numerical Examinations of Damage Process on the Chuteway Slabs of Spillway under Various Flow Conditions  

Yoo, Hyung Ju (Dept. of Civil & Environmental Engineering, Hongik University)
Shin, Dong-Hoon (Water Energy & Infrastructure Research Center, K-water)
Kim, Dong Hyun (Dept. of Civil & Environmental Engineering, Hongik University)
Lee, Seung Oh (Dept. of Civil & Environmental Engineering, Hongik University)
Publication Information
Journal of Korean Society of Disaster and Security / v.14, no.4, 2021 , pp. 47-60 More about this Journal
Abstract
Recently, as the occurrence frequency of sudden floods due to climate variability increased, the damage of aging chuteway slabs of spillway are on the rise. Accordingly, a wide array of field survey, hydraulic experiment and numerical simulation have been conducted to find the cause of damage on chuteway slabs. However, these studies generally reviewed the flow characteristics and distribution of pressure on chuteway slabs. Therefore the derivation of damage on chuteway slabs was relatively insufficient in the literature. In this study, the cavitation erosion and hydraulic jacking were assumed to be the causes of damage on chuteway slabs, and the phenomena were reproduced using 3D numerical models, FLOW-3D and COMSOL Multiphysics. In addition, the cavitation index was calculated and the von Mises stress by uplift pressure distribution was compared with tensile and bending strength of concrete to evaluate the possibility of cavitation erosion and hydraulic jacking. As a result of numerical simulation on cavitation erosion and hydraulic jacking under various flow conditions with complete opening gate, the cavitation index in the downstream of spillway was less than 0.3, and the von Mises stress on concrete was 4.6 to 5.0 MPa. When von Mises stress was compared with tensile and bending strength of concrete, the fatigue failure caused by continuous pressure fluctuation occurred on chuteway slabs. Therefore, the cavitation erosion and hydraulic jacking caused by high speed flow were one of the main causes of damage to the chuteway slabs in spillway. However, this study has limitations in that the various shape conditions of damage(cavity and crack) and flow conditions were not considered and Fluid-Structure Interaction (FSI) was not simulated. If these limitations are supplemented and reviewed, it is expected to derive more efficient utilization of the maintenance plan on spillway in the future.
Keywords
Spillway; FLOW-3D; COMSOL Multiphysics; Cavitation Erosion; Hydraulic Jacking;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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