Influence of Unsaturated Hydraulic Properties on Transient Seepage and Stability Analysis of an Earthen Dam

Puppala, Anand J.

doi:10.1061/(asce)gm.1943-5622.0002414

Cited by 10 publications

(1 citation statement)

References 38 publications

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“…The appropriate installation of time and frequency domain tensiometers and reflectometer field sensors is necessary for the measurements of matric suction and ground movement in order to increase the accuracy of numerical investigation on slope stability. Bhaskar et al [17] studied the importance of hydraulic properties on transient seepage behavior during the draw-down and analyzed the pore water pressure effects on FOS with the stability chart. The variation of pore water pressure and FOS was estimated based on hydraulic hysteresis, nonhysteresis, and saturated case.…”

Section: Introductionmentioning

confidence: 99%

Slope Stability Evaluation Due to Reservoir Draw-Down Using LEM and Stress-Based FEM along with Mohr–Coulomb Criteria

Pandey,

Knoblauch,

Zenz

2023

Water

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Rapid Draw-Down (RDD) in an earthfill dam has serious implications for dam safety regarding slope stability issues. The evaluation of reservoir draw-down impact on slope stability was carried out with the Limit Equilibrium Method (LEM) and stress-based Finite Element Method (FEM), using GeoStudio. The time-dependent Factor of Safety (FOS) and nonlinear behavior were evaluated considering 8 h of RDD. The resulting FOS values of 1.28 and 1.27 using LEM and stress-based FEM were classified as unsafe. The minimum allowable draw-down factor of safety value is 1.3, as per the guideline. The suggested two designs, with upstream horizontal filters and increased upstream dam permeability, provided an adequate FOS. However, the nonlinear analysis with coupled FEM has shown that the upstream slope is unstable in all three cases (i.e., as-built design, increased upstream dam shell permeability, and suggested application of horizontal filter layers) considering 8 h of RDD. Several gradual draw-down rates were also tested and it has been found that the FOS increases with decreased draw-down rates. FOS charts, pressure fluctuation, and flow measurements in the upstream dam shell have revealed that slope stability is highly influenced by pore water pressure and draw-down rate. The safe allowable draw-down rate of 20 h was identified, considering the as-built design of the dam.

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Section: Introductionmentioning

confidence: 99%

Slope Stability Evaluation Due to Reservoir Draw-Down Using LEM and Stress-Based FEM along with Mohr–Coulomb Criteria

Pandey,

Knoblauch,

Zenz

2023

Water

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Direct measurement of unsaturated permeability of kaolin-sand mixtures

Rahimi

Rahardjo

2023

Bull Eng Geol Environ

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Unsaturated permeabilities of six different kaolin-sand mixtures named as 100K0S, 90K10S, 80K20S, 50K50S, 20K80S, and 10K90S were directly measured using a modified flexible wall triaxial permeameter system. 90K10S means that the soil mixture contains 90% kaolin and 10% sand by dry mass. Soil–water characteristic curves (SWCC) of the kaolin-sand soil mixtures were also measured for a wide range of suctions using a Tempe pressure cell, 5-bar pressure plate, 15-bar pressure plate, and saturated salt solutions. The unsaturated permeabilities of the soil mixtures were also estimated using ten different theoretical models using (1) the measured SWCC data over a complete suction range and (2) the measured SWCC data up to 100 kPa suction in combination with the estimated SWCC data at higher suction values. The directly measured unsaturated permeability of the soil mixtures was used to validate the estimated values of unsaturated permeability. The results showed that the unsaturated permeability estimation models could reasonably fit the directly measured unsaturated permeability data when both the data from the complete measurement of SWCC and the measured SWCC data up to 100 kPa suction in combination with the estimated SWCC data at higher suction values were used.

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A Review of Stochastic Analysis of the Seepage Through Earth Dams with a Focus on the Application of Monte Carlo Simulation

Kalateh,

Kheiry

2023

Arch Computat Methods Eng

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Influence of Unsaturated Hydraulic Properties on Transient Seepage and Stability Analysis of an Earthen Dam

Cited by 10 publications

References 38 publications

Slope Stability Evaluation Due to Reservoir Draw-Down Using LEM and Stress-Based FEM along with Mohr–Coulomb Criteria

Slope Stability Evaluation Due to Reservoir Draw-Down Using LEM and Stress-Based FEM along with Mohr–Coulomb Criteria

Direct measurement of unsaturated permeability of kaolin-sand mixtures

A Review of Stochastic Analysis of the Seepage Through Earth Dams with a Focus on the Application of Monte Carlo Simulation

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