Assessment and Presentation of a Treatment Method to Seepage Problems of the Alluvial Foundation of Ghordanloo Dam, NE Iran

Talouki, Hossein Hedayati; Lashkaripour, Gholam Reza; Ghafoori, Mohammad; Saba, Abbas Ali

doi:10.1007/s12594-015-0227-2

Cited by 7 publications

(1 citation statement)

References 8 publications

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“…technology, and related engineering geological problems (foundation bearing capacity, seepage deformation, uneven settlement, sand liquefaction, etc.) (Hedayati Talouki et al, 2015;Michael, 2018;Luo and Huang, 2020;Yu and Shao, 2020;Zhang et al, 2021). The thickness variation of riverbed overburden has the obvious characteristics of basin and region, and there are many new achievements in the study of riverbed overburden from the dam site areas, especially in the section of the riverbed engineering area to the main stem and tributaries of rivers (Shi, 1986;Wang Y. S. et al, 2007;Xu et al, 2008;Wang, 2009;Xu et al, 2010;Yu and Shao, 2020;Yu and Shao, 2020).According to borehole data from construction sites of hydropower stations, the thickness variation of riverbed overburden from the top of Tiger Leaping Gorge to Xiakou is thinner in the upper and lower reaches of the Jinsha River, and deepest in the middle reaches (Hongyan Dam site thickness of 250 m) (Wang., 2009).…”

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Distribution Characteristics and Geogenic Mechanisms of Riverbed Overburden in Southwest China

Yan

Kang

et al. 2022

Front. Earth Sci.

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The distribution, scale, and engineering geological characteristics of riverbed overburden have become one of the key issues in the construction of water conservancy and hydropower engineering projects in southwest China. In this study, we summarize and discuss the (variation of thickness) distribution and the geogenic (formation) mechanisms of riverbed overburden in the associated rivers. This was done by compiling thickness data from constructed and planned dams. The results show that the overburden thickness is generally shallower in the upper Tibetan Plateau region, it is thickest in the marginal mountain region in the middle reaches, and shallower in the lower reaches of the mountain regions that are in contact with the Yunnan-Guizhou Plateau or Sichuan Basin. This holds true with the shallow-thick-shallow Distribution Law. Additionally, the river overburden has the characteristic of thickening gradually from the basin edge to the plateau slope. Through the genesis, source, and distribution of the aggradation deposits in the riverbed, the geogenic (formation) mechanisms of the river overburden layer is explored, and the coupling effect of tectonic-climatic-fluvial sedimentation processes on the variation of overburden thickness and spatial distribution is proposed. Finally, the geological problems encountered when engineering dams in thick overburden are analyzed, and common engineering measures are put forward. The results provide basic data support for water resources exploitation and further development of river engineering in Southwest China.

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confidence: 99%

Distribution Characteristics and Geogenic Mechanisms of Riverbed Overburden in Southwest China

Yan

Kang

et al. 2022

Front. Earth Sci.

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Darcian flow under/through a leaky cutoff wall: Terzaghi–Anderson's seepage problem revisited

Yakimov

Kacimov

2017

Num Anal Meth Geomechanics

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An analytical solution is obtained for 2-D steady Darcian flow under and through a cutoff wall partially obstructing a homogeneous isotropic foundation of a dam. The wall is leaky; that is, flow across it depends on the ratio of hydraulic conductivity of the wall and the wall thickness that results in the third-type (Robin) boundary condition along the wall, as compared with the Terzaghi problem for an impermeable wall. The Laplace equation for the hydraulic head is meshlessly solved in a non-standard flow tube. A Fredholm equation of the second kind is obtained for the intensity of leakage across the wall. The equation is tackled numerically, by adjusted successive iterations. Flow characteristics (total Darcian discharge and its components through the wall and the window between the wall top and horizontal bedrock, stream function, head distribution, and Darcian velocity along the wall and tailwater bed) are obtained for various conductivity ratios, head drops across the structure, thicknesses of the foundation, and the degree of its blockage by the wall. Comparisons with the Terzaghi limit of an impermeable wall show that for common wall materials and thicknesses, the leakage may constitute tens of percent of the discharge under the dam. The throughflow hydraulic gradients on a vertical wall face (Robin's boundary condition) as well as the exit gradients along a horizontal tailwater boundary (Dirichlet's boundary condition) acting for decades have deleterious impacts on dam stability because of potential heaving, piping, and mechanical-chemical suffusion.

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Deciding for Remediation of the Seepage Barrier System in Foundation of an Earthfill Dam Based on the Monitoring Data and Numerical Analysis

Aghajani

2017

Sustainable Civil Infrastructures

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Assessment and Presentation of a Treatment Method to Seepage Problems of the Alluvial Foundation of Ghordanloo Dam, NE Iran

Cited by 7 publications

References 8 publications

Distribution Characteristics and Geogenic Mechanisms of Riverbed Overburden in Southwest China

Distribution Characteristics and Geogenic Mechanisms of Riverbed Overburden in Southwest China

Darcian flow under/through a leaky cutoff wall: Terzaghi–Anderson's seepage problem revisited

Deciding for Remediation of the Seepage Barrier System in Foundation of an Earthfill Dam Based on the Monitoring Data and Numerical Analysis

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