Numerical Investigation of the Optimum Location for Vertical Drains in Gravity Dams

Nourani, Bahram; Salmasi, Farzin; Abbaspour, Akram; Bakhshayesh, Behrooz Oghati

doi:10.1007/s10706-016-0144-1

Cited by 21 publications

(12 citation statements)

References 10 publications

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“…Finally, they compared the results of the SEEP/W model to calculate the load pressure values and the flow output gradient, which had consistent matching results [9]. Nourani et al (2017), using the SEEP/W model, investigated the optimal location of vertical drainage in weight dams. The results showed that the optimum vertical drainage area was not constant.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the optimum vertical drainage area was not constant. 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.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…The paper was able to determine the factors affecting the maximum and minimum water discharges in the dam based on the surrounding environmental factors. The numerical investigation of the optimal location of vertical drains and granular filters was reported by Nourani et al (2017) and Jafari et al (2019), respectively. The harnessing of hydropower in Malaysia and the southern part of Nigeria was presented by the International Water Power Dam Construction (2020) and Okedu et al (2020), respectively.…”

Section: Introductionmentioning

confidence: 99%

Harnessing Hydropower Potential in Desert Regions: The Case of Wadi Dayqah Dam, Quriyat, Oman

Okedu

Siyabi

2021

Front. Water

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Hydropower technology is a simple and renewable form of energy that involves the conversion of potential energy due to head and mass flow rate of water into kinetic energy that drives a water turbine connected to a generator. In this paper, the potential of hydropower in the Sultanate of Oman is studied, considering Wadi Dayqah Dam in Quriyat. The following variables of the dam were used in evaluating its potential for electricity generation for the year 2010 through 2018: the amount of water flowing in and out of the dam and the amount of water available in the dam at the beginning and end of the considered years. A recommendation was made for the type of hydro turbine for maximum power extraction from the dam, based on the available water head and flow rate, considering the standard characteristic selection envelope for hydro turbines. Power generation from the dam could be affected as a result of the decline in reservoir water level, the continuous release of water for irrigation purposes, fear of the aftermath of a cyclone, lack of rains for consecutive years, and high evaporation. However, the occurrence of a cyclone increases the reservoir water level of the dam for more power generation. Some long-term scenarios for effective operation of the dam considering water availability and management were discussed. In addition, some ways of mitigating water loss from the reservoir of the dam through evaporation were proposed.

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“…They used finite-elements method (FEM) to simulate the effect of blanket in reduction of seepage. Nourani et al (2017) conducted a numerical investigation to find the optimum location for vertical drains in gravity dams. Drainage galleries are often use in gravity dams to reduce uplift force by collecting seeped waters from dam foundation.…”

Section: Introductionmentioning

confidence: 99%

Uplift pressure and hydraulic gradient in Sabalan Dam

2020

Self Cite

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The present study investigates the effects of clay core thickness and cutoff wall depth on some of the design parameters in the Sabalan rock fill dam by the finite-element method using the SEEP/W software. Clay cores with various thicknesses and cutoff walls in different situations of dam foundations were tested. The results revealed that (1) the maximum hydraulic gradient in Sabalan dam foundation occurs in the cutoff wall; (2) the minimum hydraulic gradient can be found by changing the location of the cutoff wall, under the center of clay core; and (3) discharge reduction depends on the optimum position at heel of the core. As the permeability decreases and the depth of the cutoff wall increases, the hydraulic gradient in the cutoff wall increases. As the thickness of the clay core increases, hydraulic gradient and the seepage discharge decreases and the uplift pressure increases.

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Numerical Investigation of the Optimum Location for Vertical Drains in Gravity Dams

Cited by 21 publications

References 10 publications

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

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

Harnessing Hydropower Potential in Desert Regions: The Case of Wadi Dayqah Dam, Quriyat, Oman

Uplift pressure and hydraulic gradient in Sabalan Dam

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