The influence of material characteristics on dam stability under rapid drawdown conditions

• Autorzy: Utepov Yelbek , Lechowicz Zbigniew , Zhussupbekov Askar , Skutnik Zdzisław , Aldungarova Aliya , Mkilima Timoth

Identyfikatory

DOI

10.24425/ace.2022.140184

Warianty tytułu

PL

Wpływ właściwości wbudowanych materiałów na stateczność zapory w warunkach szybkiego obniżenia poziomu wody w zbiorniku

• Języki publikacji: EN

Abstrakty

EN

A fast reduction of a reservoir level may result in instability of an earth dam caused by the high pore water pressures that remain relatively high in the embankment. Moreover, the dissipation of the accumulated pore water pressures is highly dependent on the permeability of the materials used for the embankment and the storage characteristics of the reservoir. Therefore, in the design of embankment dams, the stability analysis under rapid drawdown loading conditions is an important design case. In this study, the influence of different permeability rates on dam stability under different cases of rapid drawdown was investigated using the finite element method in SEEP/W and SLOPE/W of the GeoStudio with a case of the Lugoda dam in Ndembera catchment, Tanzania. The modeling process considers the time-dependent hydraulic conditions and the transient flow conditions using different water levels during rapid drawdown for evaluation of the factor of safety. From the 1 m per day drawdown rate; the lowest minimum factor of safety value (0.90) was obtained from the 10-7 m/s material permeability of the upstream zone of the dam. It means that, at a drawdown rate of 1m per day, there is a potential for failure of the embankment if the hydraulic conductivity value will be somewhere below 10-6 m/s.

PL

Szybkie obniżenie poziomu zwierciadła wody w zbiorniku może wywołać utratę stateczność zapory ziemnej wynikająca z dużych wartości ciśnienia wody w porach pozostających w strefie odwodnej zapory. Rozpraszanie się ciśnienia wody w porach w zaporze ziemnej zależy od przepuszczalności materiałów użytych w nasypie oraz właściwości retencyjnych zbiornika. W projektowaniu zapór nasypowych analiza stateczności podczas szybkiego opróźniania zbiornika jest ważnym przypadkiem obliczeniowym. W niniejszym artykule przeanalizowano wpływ przepuszczalności materiałów na stateczność zapory przy różnych prędkościach szybkiego opróżniania zbiornika z wykorzystaniem metody elementów skończonych przy pomocy programów SEEP/W i SLOPE/W oprogramowania GeoStudio na przykładzie zapory Lugoda w Ndemberze zlewni w Tanzanii. W procesie modelowania uwzględniono warunki hydrauliczne zależne od czasu oraz przejściowe warunki przepływu przy różnych poziomach wody podczas szybkiego opróżniania zbiornika przy ocenie współczynnika stateczności. Przy szybkim opróźnianiu zbiornika wynoszacym 1 m na dobę zaobserwowano, że najmniejsza wartość współczynnika stateczności (0,90) uzyskano przy wartości przewodności hydraulicznej wynoszacej 10-7 m/s. Oznacza to, że przy prędkości obniżania poziomu wody w zbiorniku o 1 m na dobę, istnieje możliwość utraty stateczności nasypu, jeśli wartość przewodności hydraulicznej będzie mniejsza niż 10-6 m/s.

Słowa kluczowe

EN

slope stability; embankment dam; hydraulic conductivity; pore water pressure; safety factor

PL

stateczność skarpy; zapora ziemna; przewodność hydrauliczna; ciśnienie wody w porach; współczynnik stateczności

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2022
• Tom: Vol. 68, nr 1
• Strony: 539--553
• Opis fizyczny: Bibliogr. 37 poz., il., tab.

Twórcy

autor

Utepov Yelbek

• Department of Civil Engineering, L.N. Gumilyov Eurasian National University, Nur-Sultan, Republic of Kazakhstan

• https://orcid.org/0000-0001-6723-175X

autor

Lechowicz Zbigniew

• Institute of Civil Engineering, Warsaw University of Life Sciences, Warsaw, Poland

• https://orcid.org/0000-0002-1426-5881

autor

Zhussupbekov Askar

• Department of Civil Engineering, L.N. Gumilyov Eurasian National University, Nur-Sultan, Republic of Kazakhstan

• https://orcid.org/0000-0003-2229-1059

autor

Skutnik Zdzisław

• Institute of Civil Engineering,Warsaw University of Life Sciences, Warsaw, Poland

• https://orcid.org/0000-0003-3228-4936

autor

Aldungarova Aliya

• CSI Research&Lab, LLP, Nur-Sultan, Kazakhstan

• https://orcid.org/0000-0002-9248-7180

autor

Mkilima Timoth

• Department of Civil Engineering, L.N. Gumilyov Eurasian National University, Nur-Sultan, Republic of Kazakhstan

• https://orcid.org/0000-0003-1170-0494

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).