Seepage Analysis for Shurijeh Reservoir Dam Using Finite Element Method

2011 ◽  
Author(s):  
S. Soleymani ◽  
A. Akhtarpur
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Seepage Analysis ◽  
Element Method

Numerical oscillation in seepage analysis of unsaturated soils

2001 ◽  
Vol 38 (3) ◽  
pp. 639-651 ◽  
Author(s):  
Muthusamy Karthikeyan ◽  
Thiam-Soon Tan ◽  
Kok-Kwang Phoon
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Unsaturated Soil ◽  
Unsaturated Soils ◽  
Heat Diffusion ◽  
Step Size ◽  
Time Step ◽  
Seepage Analysis ◽  
Time Step Size ◽  
Element Method

The finite element method provides a popular means of analyzing groundwater flow in an unsaturated soil. In such problems, oscillatory results are often observed in the finite element solution. Such a phenomenon is observed, for example, when a typical finite element program such as Seep/w is used to model water infiltration into unsaturated soils. Numerical oscillations are often found near the wetting front where the hydraulic gradient is the steepest. These oscillations do not always reduce with decreasing or increasing time-step size alone; rather, an appropriate ratio between time-step size and element size is required. As the pore-water pressures predicted from a transient seepage analysis are used as input groundwater conditions for other types of analysis such as slope stability, contaminant transport, and capillary barrier, these oscillations may have important practical ramifications. Since seepage analysis is common in engineering practice, it is important that appropriate criteria are identified to minimize, if not to remove, the oscillations. In this paper, numerical examples are provided to demonstrate that a simple set of criteria, developed in heat diffusion problems with constant properties to control oscillation, is also applicable to one- and two-dimensional unsaturated seepage analyses, for a range of material nonlinearities that are frequently encountered in unsaturated soils.Key words: unsaturated soil, soil-water characteristic curve, seepage analysis, finite element method, numerical oscillation.

Calculation of Earth-Rock Dam Seepage Based on Boundary Element Method with the Infinitely Deep Permeable Foundation

2012 ◽  
Vol 212-213 ◽  
pp. 241-244
Author(s):  
Liang Liang Chen ◽  
Liang Ma ◽  
Feng Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Calculation Model ◽  
Seepage Analysis ◽  
Dam Foundation ◽  
Foundation Construction ◽  
The Earth ◽  
Element Method

The seepage analysis is an important part of the earth-rock dam design, it is often calculated by using finite element method. In the infinitely deep permeable foundation construction of the dam, foundation deep permeable layer, preferably using the boundary element method to calculate. In this paper, the boundary element method is used to establish the construction of earth-rock dams in the blanket impervious seepage calculation model in the infinitely deep permeable foundation, and verify the feasibility of the model and provide reference for designers.

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