SEEPAGE is a program designed for second year undergraduates who will have
attended one term of lectures on soil mechanics.
The aim is to provide the user with an interactive capability for producing
flownets for the following categories of commonly occuring geotechnical
- flow beneath a cantilever retaining wall
- flow through an earth dam
- flow beneath a concrete dam with cut-off
Inputs and Outputs
A student can choose one of the above categories to investigate and then
change the geometry of the boundaries that define it. He can also change the
potential of the upstream and downstream boundaries of each category and
enter a permeability for the soil. Output is in the form of a flownet with
ten potential intervals, the water pressure at any selected point can then be
output directly. Flow quantities are automatically displayed, consistent
with input information concerning the permeability, which is taken to be
constant and isotropic throughout the flow region.
A finite element mesh is generated automatically to cover the area inside the
boundaries. Laplace's equation is then solved both for the potential and
stream functions using the finite element technique (Galerkin) as described
by Brebbia and Ferranti. The boundary conditions for the stream function are
obtained from the solution of the potential function so that curvelinear
squares are produced.
A simple contouring routine is used to obtain the lines of constant
potential and flow.
Updated on 12th December, 1997