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Prognoza hydrogramu wypływu powstałego w wyniku symulacji awarii zapory Besko

100%

Mirosław-Świątek D. , Merkel M. , Mańk K. , Kosik A.

Czasopismo Techniczne. Środowisko

2012

tom R. 109, z. 3-Ś

115--127

Jednym z głównych elementów prognozy hydraulicznych skutków awarii zapory jest określenie najbardziej prawdopodobnej przyczyny jej uszkodzenia oraz ilościowego opisania niekontrolowanego opróżniania zbiornika. W artykule przeanalizowano hydrogramy wypływu powstałe w wyniku symulacji katastrofy zapory Besko. Przedstawiona w artykule symulacja została zaimplementowana w modelu obliczeniowym MIKE 11. Awarie zapory modelowano za pomocą modułu obliczeniowego DAMBRK, natomiast gospodarowanie wodą na zbiorniku zostało opracowane w procedurze CONTROL OPERATION. Powstające hydrogramy wypływu przez wyrwę przeanalizowano pod kątem maksymalnego wydatku, objętości oraz czasu narastania i opadania fali.

When predicting hydraulic effects of a dam failure, it is essential to identify the most likely cause of the damage and to describe quantitatively the uncontrolled emptying of the reservoir. The paper analyzes the outflow hydrographs resulting from the Besko Dam break simulation. The simulation presented in the article has been implemented in a MIKE 11 model. The dam failure was modeled using the DAMBRK computational module, and the water management in the reservoir was developed in the CONTROL OPERATION procedure. The resulting outflow hydrographs were analyzed in terms of the maximum discharge, water volume and the time of rising and descending of the wave.

Probabilistic finite element analysis of failures in concrete dams with large asperities in the rock-concrete interface

80%

Ulfberg A. , Gonzalez-Libreros J. , Das O. , Bista D. , Westberg Wilde M. , Johansson F. , Sas G.

Archives of Civil and Mechanical Engineering

2023

tom Vol. 23, no. 2

art. no. e109, 2023

Common analytical assessment methods for concrete dams are unlikely to predict material fracture in the dam body because of the assumption of rigid body behavior and uniform- or linear stress distribution along a predetermined failure surface. Hence, probabilistic non-linear finite element analysis, calibrated from scale model tests, was implemented in this study to investigate the impact of concrete material parameters (modulus of elasticity, tensile strength, compressive strength, fracture energy) on the ultimate capacity of scaled model dams. The investigated dam section has two types of large asperities, located near the downstream and/or upstream end of the rock-concrete interface. These large-scale asperities significantly increased the interface roughness. Post-processing of the numerical simulations showed interlocking between the buttress and the downstream asperity leading to fracture of the buttress with the capacity being determined mainly by the tensile strength of the buttress material. The capacity of a model with an asperity near the upstream side, with lower inclination, was less dependent on the material parameters of the buttress as failure occurred by sliding along the interface, even with inferior material parameters. Results of this study show that material parameters of the concrete in a dam body can govern the load capacity of the dam granted that significant geometrical variations in the rock-concrete interface exists. The material parameters of the dam body and their impact on the capacity with respect to the failure mechanism that developed for some of the studied models are not commonly considered to be decisive for the load capacity. Also, no analytical assessment method for this type of failure exists. This implies that common assessment methods may misjudge the capacity and important parameters for certain failure types that may develop in dams.