Performance of the horizontal drains in upstream shell of earth dams on the upstream slope stability during rapid drawdown conditions

Moharrami, Abdolreza; Hassanzadeh, Yousef; Salmasi, Farzin; Moradi, Gholam; Moharrami, Gholamreza

doi:10.1007/s12517-013-0872-y

Cited by 10 publications

(4 citation statements)

References 5 publications

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“…Stability analysis during rapid drawdown is an important consideration in the design of embankment dams, as the stabilizing effect of the water on the upstream face is lost, but the pore water pressures within the embankment may remain high. As a result, the stability of the upstream face of the dam can be much reduced (Moharrami et al, 2013). The earth dam may be exposed to the collapse in the case of the rapid drawdown of water level .…”

Section: Methodsmentioning

confidence: 99%

Slope stability analysis of a dam. Case study: Hălceni Reservoir, Iasi county, Romania

BALAN,

GIURMA-HANDLEY,

CRENGANIȘ

et al. 2024

pesd

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Considering the overall behavior monitoring of an earth dam, the infiltration regime and the stability of slopes are the most important aspects to be considered, in order to permanently assess the technical status of the dam and its risk of collapse or breach. This paper presents the stability analysis for the upstream slope of Hălceni Dam, performed by the finite element stability method, using SLOPE-GeoStudio program, under the condition of the drawdown water level. Firstly, the infiltration curve in the dam was drawn with SEEP/W-GeoStudio program, according to the maximum level measured during the flood in June 2019. The effects of slow drawdown and rapid drawdown from the maximum water level in the reservoir were analyzed. Built-in finite element algorithms used in the SEEP/W and SLOPE/W solved the analysis and the results were obtained as a range of Factor of Safety (FS) values, that were later compared to the admissible Factor of Safety established in the legislation and the technical regulations in force in Romania. Both the measured parameters and the visual observations showed that the dam performed exceptionally well, in accordance with design specifications and predicted behavior for the evolution of the response parameters to external stresses.

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Section: Methodsmentioning

confidence: 99%

Slope stability analysis of a dam. Case study: Hălceni Reservoir, Iasi county, Romania

BALAN,

GIURMA-HANDLEY,

CRENGANIȘ

et al. 2024

pesd

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show abstract

“…Tailings disposal has always been an important concern worldwide [1][2][3], with the goal of protecting the environment and people from the hazards associated with tailings storage. Currently, the upstream method is mostly used to construct tailings dams [4], but this makes the immersion line higher and leads to the sand in the dam becoming fully saturated. In addition, tailings sand is very sensitive to the ground motion load and prone to liquefaction deformation and even instability and damage.…”

Section: Introductionmentioning

confidence: 99%

A Threshold Model of Tailings Sand Liquefaction Based on PSO-SVM

et al. 2022

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The liquefaction of tailings sand caused by seismic loads is a major problem in ensuring the safety of tailings ponds. Liquefaction may cause uncontrolled fluidized failure of the dam body, causing considerable damage to the lives, property and environment of people downstream. In this paper, a prototype tailings sand is used as the material to consider the main factors affecting liquefaction (i.e., dynamic load, soil quality, burial and static conditions). By embedding acceleration, pore pressure and earth pressure sensors in the rigid design of the self-designed rigid model box, different types of seismic waves of different ground motion amplitudes (PGA) were induced in a shaking table test of tailings sand liquefaction. The seismic intensity, waveform (class II, III and IV seismic waves) and active earth pressure of the PGA characterizing dynamic factors were obtained, and the static factors were characterized. The dynamic shear stress ratio, the peak acceleration of the earthquake, the pore pressure of the drainage factor and the buried depth (overlying effective pressure) characterize the soil conditions. SPSS software was used to analyze the factor dimension reduction, and the most suitable factors for factor analysis were obtained. Particle Swarm Optimization (PSO) was used to optimize the parameters, and the improved PSO-SVM algorithm was compared with the existing genetic algorithm (GA) and grid node search (GS). The algorithm used in this paper is fast and has a relatively high accuracy rate of 92.7%. The established threshold model method is of great significance to predict the liquefaction of tailings sand soil under the action of ground motions and to carry out safety managemenin advance, which can provide a certain reference for the project.

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“…Mishal and Khayyum (2018) derived an empirical equation to find earth dam safety factors for similar geometries and soil properties without slope stability analysis, they assumed different soil parameters to derive the formula and then compared the results of the formula with the results of GeoStudio, there was a good agreement between the results and the standard error was 0.0714. Moharrami, et al, (2013) studied rapid drawdown condition under the effect of horizontal drains on the stability of the upstream slope, the results revealed that the horizontal drains in the upstream shell of the dam has a positive impact on the stability of the dam and is cost-effective. Malekpour, et al, (2012) mentioned that using the horizontal drain with proper lengths and thickness guarantees the safety of the dam during transient seepage as a result of the fast lowering of reservoir water level.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Shell Permeability on Stability of Upstream Slope during Rapid Drawdown – Khassa Chai Earth Dam as a Case Study

Noori¹,

Salim²

2021

INJES

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Several factors affect the stability of earth dam during sudden drawdowns such as permeability and mechanical properties of soil, upstream side slope, drawdown ratio, and drawdown rate. This paper investigates the influence of shell permeability on earth dam upstream slope stability and its role in the change of pore water pressure at different locations of the embankment during the sudden drawdown, using different limit equilibrium methods. To accomplish the objective of this study, (Geo Studio 2012 Software) as one of the powerful geotechnical programs was used for the modeling and numerical analysis. The study shows that decreasing in the shell permeability resulted in the reduction of pore water pressure dissipation and variation of shell hydraulic conductivity plays a vital role in the overall stability of the upstream slope under rapid drawdown conditions.

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Performance of the horizontal drains in upstream shell of earth dams on the upstream slope stability during rapid drawdown conditions

Cited by 10 publications

References 5 publications

Slope stability analysis of a dam. Case study: Hălceni Reservoir, Iasi county, Romania

Slope stability analysis of a dam. Case study: Hălceni Reservoir, Iasi county, Romania

A Threshold Model of Tailings Sand Liquefaction Based on PSO-SVM

The Influence of Shell Permeability on Stability of Upstream Slope during Rapid Drawdown – Khassa Chai Earth Dam as a Case Study

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