Modeling assessment of seepage and slope stability of dam under static and dynamic conditions of Grindeho Dam in Ethiopia

Hailu, Melese Baye

doi:10.1007/s40808-020-01006-2

Cited by 7 publications

(4 citation statements)

References 5 publications

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“…However, in case the pipe is provided in the dam then it should be provided with horizontal filter or vertical filter diaphragm to prevent the washing of fines during leakage. [16] studied the static and dynamic analysis of Grindeho dam in Ethiopia. Seepage rate is observed in reservoir full, empty reservoir level, and drawdown conditions.…”

Section: Literature Review and Objectivementioning

confidence: 99%

Static and pseudo-static stability analysis of right earthen embankment of nagarjuna sagar dam by geostudio

Jyothi,

Singh

2023

E3S Web Conf.

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To ensure the safety of the dam, stability assessment of the dam is necessary. The objective is to perform slope stability analysis for upstream, downstream and seepage analysis during steady state, transient seepage conditions and to know about the displacement occurred at history nodes by the application of pseudo-static ground motion. The present work deals with the behavior of the Right earthen embankment of Nagarjuna Sagar which is in earthquake prone area of Zone-II (as per IS 1893-2002). Stability parameters slope, seepage and earthquake analyzed by SLOPE/W, SEEP/W, QUAKE/W tools in GeoStudio 2022 (finite element modeling based software). The model with full reservoir level is first analyzed by SEEP/W to find piezometric line which is basis to perform SLOPE/W for finding slope stability. Later an earthquake motion of 0.1 peak ground acceleration is subjected to it by using QUAKE/W. It is concluded from results, that obtained factor of safety lie within safety limits and seepage loss observed during the design life of 100 years is 562290 m3, 3431117 m3 for steady state and rapid drawdown.

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Section: Literature Review and Objectivementioning

confidence: 99%

Static and pseudo-static stability analysis of right earthen embankment of nagarjuna sagar dam by geostudio

Jyothi,

Singh

2023

E3S Web Conf.

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“…The dam dimensions verification was carried out by slope stabilization using the GeoStudio 2012 program used in other studies [80][81][82]. In both cases-without seismic loads and with seismic loads of the upstream slope and downstream slope (Figures 13 and 14)-a safety factor greater than 1.5 was obtained, which means that there is sufficient resistance in the soil in the area to withstand the shear stresses that would cause failures or landslides.…”

Section: Verificationmentioning

confidence: 99%

Earth Dam Design for Drinking Water Management and Flood Control: A Case Study

Merchán-Sanmartín

Aucapeña-Parrales²,

Alcívar-Redrován³

et al. 2022

Water

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Water management for natural channels is a frequent challenge due to the inefficient usage of water resources. The 2030 Agenda of the United Nations (SDG 6 of sustainable development) focuses its attention on water and sanitation. The Sara Guerrero site, located in the Mocache municipality in Los Ríos province (Ecuador), has issues related to access to drinking water, flood control, and crop irrigation that affect 4300 people and 24,000 hectares. The river overflows throughout the rainy season (late December to early May), whereas there is a noticeable water shortage during the dry season. This project aims to design a multiple-use earth dam on the Vinces River, simulating the resulting flow in extreme cases due to its possible failure. Such a study implies the development of a contingency plan for the preservation of life. It considers (i) dam breach analysis and design, and (ii) hydraulic model development using the ArcMap and HEC-RAS software packages. The design includes a waterproofing system that controls possible leaks and a cymbal spillway, mainly for raw water collection. The generated model showed that the shorter the failure time, the higher the maximum output flow. Modelling revealed that four towns would be affected for a maximum of 31 h in extreme cases. This approach offers comprehensive management for this community with regards to the earth dam and flood control.

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“…In such studies, the unsaturated soil properties are rarely considered, though they play important roles in the slope's stability. Based on the similarity theory, the physical model can simulate the actual conditions of dam slopes in every situation, including varying reservoir water levels and earthquakes [29][30][31]. If a centrifuge is available, the gravity stress within the dam slope can be loaded to the true value, as in the prototype, thus producing a more reliable test result [32,33].…”

Section: Introductionmentioning

confidence: 99%

Seepage and Stability Analysis of Earth Dams’ Downstream Slopes, Considering Hysteresis in Soil–Water Characteristic Curves under Reservoir Water Level Fluctuations

Liu,

Zhou,

Zhang

et al. 2024

Water

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Fluctuations in reservoir water levels have a significant impact on the seepage and slope stability of earth dams. The varying rate of the water level and soil–water characteristic curve (SWCC) hysteresis are the main factors affecting the seepage and the stability of dam slopes; however, they are not adequately considered in engineering practices. In this study, the SEEP/W module and the SLOPE/W module of Geo-studio were employed to analyze the seepage features and the stability of downstream slopes, taking into account the water level fluctuation rate and the SWCC hysteresis. The results reveal that the pore water pressure of the representative point forms a hysteresis loop when the water level fluctuates, which becomes smaller as the water level variation rate increases. Within the loop, the pore water pressure with a rising water level is greater than the value when the water level is dropping, and the desorption SWCC derives greater pore water pressures than the adsorption SWCC. Similarly, the safety factor (Fs) curves under the condition of water level fluctuations also form a hysteresis loop, which becomes smaller as the variation rate of the water level increases. When the water level fluctuation rate increases to 4 m/d, the two curves are tangent, meaning that the Fs with a rising water level is always greater than the value when the water level is dropping. The desorption SWCC derives a lower Fs value than the adsorption SWCC as the water level draws up, but this initiates no evident difference in the Fs value when the water level draws down. These findings can be used to inform the design and operation of earth dams under fluctuating water levels.

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Modeling assessment of seepage and slope stability of dam under static and dynamic conditions of Grindeho Dam in Ethiopia

Cited by 7 publications

References 5 publications

Static and pseudo-static stability analysis of right earthen embankment of nagarjuna sagar dam by geostudio

Static and pseudo-static stability analysis of right earthen embankment of nagarjuna sagar dam by geostudio

Earth Dam Design for Drinking Water Management and Flood Control: A Case Study

Seepage and Stability Analysis of Earth Dams’ Downstream Slopes, Considering Hysteresis in Soil–Water Characteristic Curves under Reservoir Water Level Fluctuations

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