Finite Element Simulative Analysis of Inclined Clay-Core Wall Rockfill Dam Structure

2011 ◽  
pp. 566-571
Author(s):  
DongYu Ji
Keyword(s):  
Finite Element ◽  
Rockfill Dam ◽  
Clay Core

Susceptibility of Clay Core to Cracks in Rockfill Dams by Finite Element Modeling

2007 ◽  
Vol 18-19 ◽  
pp. 35-41 ◽  
Author(s):  
S.O. Osuji ◽  
B.U. Anyata
Keyword(s):  
Mathematical Modeling ◽  
Finite Element ◽  
Downstream Face ◽  
The Finite Element Method ◽  
Rockfill Dam ◽  
Core Section ◽  
Clay Core ◽  
Longitudinal Cracks ◽  
Mathematical Modeling Technique

The behaviour of the core of rockfill dam with slanting clay core was investigated with the Jebba main dam, Nigeria as a case study. The stress-deformation behavior of the dam was studied using the finite element mathematical modeling technique. The actual fill properties were utilized and two loading scenarios-no water and full reservoir operations-were investigated. At full reservoir, the actual seepage line, as recorded over the years was used. The linear total stress analysis using the finite element method of analysis was employed to analyze the dam section. Following the finite element mathematical modeling and computer simulations of the models, deformations and stresses distributions were determined. The results showed that the observed longitudinal cracks at the Jebba main dam crest are as a result of potential cracks in the dam core section. The cracks observed at the crest, from analysis, commenced from the dam’s core upstream face, downstream face and core crest. This may have resulted from probable hydraulic fracturing and tensile stresses developments in these regions. The results also showed likely loss of integrity of core due to cracks. However, total collapse may not be experienced but dam performance may be impaired and alarming visible cracks may not be ruled out over time.

Stress-Deformation Numerical Analysis of Clay Core Rockfill Dam Based on Duncan-Chang E-B Model

2013 ◽  
Vol 275-277 ◽  
pp. 1436-1440
Author(s):  
Hong Hai Zhang ◽  
Ai Min Gong ◽  
Chun Yan Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Stress Level ◽  
Normal Operating Condition ◽  
Rockfill Dam ◽  
Distribution Rule ◽  
Safe State ◽  
Clay Core ◽  
Core Rockfill Dam

Used static finite element method to analyse the clay core rockfill dam of laojunshan reservoir whith Duncan-Chang E-B model. The results shows that the maximum of stress level is 0.78 under completion mode, and the maximum of stress level is 0.9 under normal operating condition. The stress and displacement value of the dam as well as its distribution rule is normal, and the maximum of stress level is less than 1. The possibility of occurring hydraulic split for core-wall is very small, and the dam is in a safe state.

Numerical analysis of the anti-seepage measures for high earth rockfill dam on deep overburden

2012 ◽  
Vol 170-173 ◽  
pp. 1872-1877 ◽  
Author(s):  
Jun Yan ◽  
Si Hong Liu ◽  
Bin Zhou
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Seepage Field ◽  
Seepage Analysis ◽  
The Real ◽  
Rockfill Dam ◽  
The Stability ◽  
High Rockfill Dam ◽  
At Home

The anti-seepage measures of a high earth rockfill dam built on the foundation with a deep overburden affects the stability and safety of the dam greatly. Nowadays there are few researches on this area both at home and abroad. On the basis of the finite element seepage analysis of the Pubugou high rockfill dam in which core walls and two cut-off walls are designed as the anti-seepage measures, the real seepage behavior of the seepage field is obtained in this paper, as well as the seepage characters of the seepage field under different arrangements of the cut-off walls. The conclusions have a certain referential value for the design of the anti-seepage measures for the similar projects with the foundation of a deep overburden.

Stochastic finite element analysis of rockfill dam considering spatial variability of dam material porosity

2019 ◽  
Vol 36 (9) ◽  
pp. 2929-2959
Author(s):  
Hui Chen ◽  
Donghai Liu
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Spatial Variability ◽  
Random Field ◽  
Model Parameters ◽  
Mechanical Parameters ◽  
Stochastic Finite Element ◽  
Content Type ◽  
Rockfill Dam ◽  
Stochastic Fem

Purpose The purpose of this study is to develop a stochastic finite element method (FEM) to solve the calculation precision deficiency caused by spatial variability of dam compaction quality. Design/methodology/approach The Choleski decomposition method was applied to generate constraint random field of porosity. Large-scale laboratory triaxial tests were conducted to determine the quantitative relationship between the dam compaction quality and Duncan–Chang constitutive model parameters. Based on this developed relationship, the constraint random fields of the mechanical parameters were generated. The stochastic FEM could be conducted. Findings When the fully random field was simulated without the restriction effect of experimental data on test pits, the spatial variabilities of both displacement and stress results were all overestimated; however, when the stochastic FEM was performed disregarding the correlation between mechanical parameters, the variabilities of vertical displacement and stress results were underestimated and variation pattern for horizontal displacement also changed. In addition, the method could produce results that are closer to the actual situation. Practical implications Although only concrete-faced rockfill dam was tested in the numerical examples, the proposed method is applicable for arbitrary types of rockfill dams. Originality/value The value of this study is that the proposed method allowed for the spatial variability of constitutive model parameters and that the applicability was confirmed by the actual project.

Static Performance of Face Rockfill Dam on the Principle of Finite Element

2013 ◽  
Vol 438-439 ◽  
pp. 1351-1354
Author(s):  
Yu Zhao ◽  
Ya Li Wang
Keyword(s):  
Finite Element ◽  
Good Choice ◽  
Rockfill Dam ◽  
Geological Conditions ◽  
Static Performance ◽  
Completion Date ◽  
Normal Water ◽  
Stress And Deformation ◽  
Concrete Face ◽  
Concrete Face Rockfill Dam

The concrete face rockfill dam has a strong ability to adapt to the terrain and geological conditions, which is a good choice of dam type for easy construction, short constructed period, safe and good shock resistance. Therefore, the study of stress and deformation in the completion date, normal water level and rapid drawdown is of very important in significance. In this paper, a face rockfill dam is studied by the finite element method.

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