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Research project on steady state seepage


This module involves student groups constructing physical models of hydraulic structures to study steady-state seepage. Five models are constructed in a given laboratory session. This project is conducted after the constant head and falling head permeability laboratory exercise is conducted. The students are asked to use the same sand and follow generally the same sample preparation procedure in constructing their flow model as the ones used in preparing the permeability test specimens, so the permeabilities can be used in the analysis of the flow models. In the permeability laboratory, students are also asked to conduct mechanical sieve analysis test on the sand to determine its effective size (D10) to estimate permeability based on Hazen’s equation. Before the research project on seepage is conducted, a laboratory session on numerical modeling of steady state seepage is also conducted where students learn to use the finite element-based commercial software SEEP/W.  Students observe the flow patterns and measure flow rate through their model and piezometric heads at some locations. They use these experimental observations to validate their graphical and numerical solutions. They write a 6 to 8 page long technical paper with all group members as co-authors.

(a) dike

(b) dike with a cutoff at downstream toe

(c) earth dam with a blanket drain

Groups of students constructed these physical models to study steady-state seepage. The dye is used to observe flow paths.

(d) dike with  upstream cutoff

(e) sheet pile cutoff wall

 

 

 

 

 

 

 

 

(a) physical model

(b) hand drawn flownet

(c) numerical solution using the computer program SEEP/W

Physical model, graphical solution and computer output generated by students as a part of their research project on steady-state seepage

 

Last modified June 11 2010 04:39 PM

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