Seepage analysis of earth dams considering spatial variability of hydraulic parameters

Tan, Xuezhi; Wang, Xue; Khoshnevisan, Sara; Hou, Xiyong; Zha, Fusheng

doi:10.1016/j.enggeo.2017.08.018

Cited by 62 publications

(22 citation statements)

References 33 publications

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“…Nevertheless, these ranges are consistent with analyses of soil parameter variability at field scale (Russo et al, 1997 andBotros et al, 2009). However, for higher values of ranges (from hundreds of meters to a thousand meter), the influ ence of horizontal range on the flow rate in unsaturated zone was shown to be more significant (Tan et al, 2017).…”

Section: Discussionmentioning

confidence: 92%

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Impact of spatial variability in hydraulic parameters on plume migration within unsaturated surficial formations

Pannecoucke

Coz

Houzé

et al. 2019

Journal of Hydrology

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Heterogeneities in textural properties of surficial formations at field scale resuit in spatial variations in hydraulic parameters governing unsaturated zone flow. This study aims at quantifying the influence of such variations on soluté transport resulting from a localized source of radioactive contaminant at ground level. The study focuses on three hydraulic parameters related to the Mualemvan Genuchten formalism, namely the saturated hydraulic conductivity K4, the parameter a inversely proportional to the air-entry value, and the parameter n related to the pore-size distribution. Sets of random fields accounting for spatial variability of these parameters are generated using lognormal dis tributions with different variances and corrélation lengths. These random fields are used as inputs to an unsaturated flow and transport model to simulate radionuclide plume migration.

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Section: Discussionmentioning

confidence: 92%

“…Thus, by comparison with homogeneous parameter fields, random fields generated with (72(logiF5) = 0,14, cr2(logcy) = 0,036 and cra(logn) = 0.005, i.e. mean variances calculated based on the WoSIS database, respectively resuit in (i) 25, 20 and 6Ë% increase in plume size; Zhang, 2002 andTan et al, 2017) in the unsaturated zone.…”

Section: Discussionmentioning

confidence: 99%

Impact of spatial variability in hydraulic parameters on plume migration within unsaturated surficial formations

Pannecoucke

Coz

Houzé

et al. 2019

Journal of Hydrology

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“…By increasing the vertical distance between the drainages and decreasing the drainage diameter, the optimum location of the vertical drainage leads to the downstream [10]. Tan et al (2017) used the combination of the Monte Carlo method and finite difference to calculate the flow rate. Also, the effect of the coefficient of variation and the correlation coefficient of hydraulic parameters on the flow rate has been compared [11].…”

Section: Introductionmentioning

confidence: 99%

“…Tan et al (2017) used the combination of the Monte Carlo method and finite difference to calculate the flow rate. Also, the effect of the coefficient of variation and the correlation coefficient of hydraulic parameters on the flow rate has been compared [11]. Sci and Circumiectus (2017) used a two-dimensional HYDRUS numerical model to estimate the amount of flushing.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Grout Curtain Parameters on Uplift and Piping Phenomenon; Case Study: Sattarkhan Dam

Meshkabadi

Zandi

2019

Hydrology

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Design of earth dams and their issues during and after construction is very important for residents downstream of the dam because of the potential risks and possible breakdowns. In the design of dams, various forces influence the dam body, including uplift pressure and piping phenomenon which should be considered in order to ensure the safety of the dam. Among the measures taken to prevent the washing away phenomenon, the reduction of the output gradient, and the leakage discharge from beneath the hydraulic structures, construction of the grout curtain and installation of the drainage are applicable. Therefore, in order to investigate the effect of various parameters such as the gradient angle of the grout curtain, length, and distance and the number of grout curtains, as well as the length of the drainage on the pressure and output gradient of the numerical models, were considered in current study. For this purpose, the SEEP/W software was used for modeling on Sattarkhan Dam as a case study. The results of the analysis showed that the use of the Qa’im grout curtain at the upstream of the dam has the highest resistance against the pressure and piping phenomenon. The results also showed that increase in the length of the curtain of the water seal increases safety against uplift and piping phenomenon. The use of further spacing between the two grout curtains under the core of the dam led to increase in overall pressure or reduction in safety against uplift pressure. Increase in the length of the horizontal drainage reduced the effects of uplift pressure and output gradient. Results show that period of 70 to 110 degree is appropriate for curtain angle and setting curtain in upstream of dam core with angle of 70 to 80 degree is optimum and economic. A length of 30 m is optimum for curtain. The number of 2 curtains is also optimum. Studying various scenarios of distance of 2 curtains in dam core indicates that distance of 6 m is optimum and also length of 18 m for horizontal drainage is optimum.

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“…More studies can be found in Tan et al. [23], Srivastava et al [24], Ahmed [25,26], and Griffiths and Fenton [27][28][29]. In terms of dam sliding, the effect of uncertainty in the cohesive strength of the interface between a concrete dam and a rock foundation was examined by Krounis et al [5].…”

Section: Introductionmentioning

confidence: 99%

Reliability analysis of stability against piping and sliding in diversion dams, considering four cutoff wall configurations

Hekmatzadeh

Zarei

Johari

et al. 2018

Computers and Geotechnics

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The stability against piping and sliding, which is subject to numerous sources of uncertainty, is of great importance in the design of diversion dams. In this study, the performance of four cutoff wall configurations, including a single wall and two walls with half the length of the single wall, was evaluated stochastically using the random finite element method. The Cholesky decomposition technique in conjunction with three types of Auto-Correlation Function (ACF) was employed to generate numerous random fields. The results indicate that the probabilities of failure related to different cutoff wall configurations are similar, considering isotropic hydraulic conductivity. However, there are noticeable differences between the probabilities of failure of these configurations in anisotropic situations. Moreover, the use of a single cutoff wall on the upstream face of an impervious blanket provides the lowest probability of failure for piping. In addition, the exponential ACF ends up with greater exit hydraulic gradients than the second-order Markov and binary noise ACFs. In addition, the sliding stability of the ordinary and earthquake load combinations was examined stochastically using random field theory and Monte Carlo Simulation (MCS). The probability of failure appears to increase with an increase in the autocorrelation distance.

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Seepage analysis of earth dams considering spatial variability of hydraulic parameters

Cited by 62 publications

References 33 publications

Impact of spatial variability in hydraulic parameters on plume migration within unsaturated surficial formations

Impact of spatial variability in hydraulic parameters on plume migration within unsaturated surficial formations

The Effects of Grout Curtain Parameters on Uplift and Piping Phenomenon; Case Study: Sattarkhan Dam

Reliability analysis of stability against piping and sliding in diversion dams, considering four cutoff wall configurations

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