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Developing an Object-oriented Computer Program for Seepage Analysis through Earth Dams using Boundary Element Method

Asadi, Roza | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39869 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ashtiani, Ataie
  7. Abstract:
  8. Destruction of a dam is not only an economic disaster but also a catastrophe for the down stream residents. Seepage related problems are the main reasons for the destruction of the embankment dams. Therefore controlling seepage in an earth dam is of great importance.Graphical, experimental,and numerical methods can be applied for analysis of seepage problems in embankment dams.Due to the complexity of geometry and of in homogeneous and/or anisotropic media there are few analytical solutions to porous media problems. Numerical solutions have long played an important role in ground water calculation such as Finite Difference Method (FDM),Finite Element Method (FEM) and Boundary Element Method (BEM).In these methods the BEM has the virtue of reducing the domain of calculation by one dimension.The lack of necessity of discretizing the entire domain leads,in general,to a great gain in efficiency and both the computing time and computer storage requirements are much less. Because the object-oriented programming designs a modular, reusable and extensible numerical solution of problems using the BEM, we use this paradigm in our software. Based on the object-oriented programming approach together with the efficient coding in VisualBasic, the software can handle steady state and transient seepage problems such as rapid drawdown and pounding. The program is also be able to do the calculations when the dam includes multiple homogeneous isotropic or anisotropic zones of different hydraulic conductivity,so the model can be applied for the zoned earth dams with core, shell, impervious blanket, chimney drain, cut off wall and layered foundation.In addition far-end element has been utilized to properly model the influence of the far-end boundaries.This causes a very efficient method to reduce computational efforts for long distance boundaries.The result of present model are assessed with the available analytical solutions, experimental data and the result of some other numerical methods.The present model is verified in these comparisons.

  9. Keywords:
  10. Earth Dam ; Percolation ; Numerical Method ; Boundary Element Method ; Object-Oriented Programming

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