Separation Of Salt And Sweet Waters In An
Area Of Former Mines
Author(s)
P. P. Prochazka & V. Dolezel
Abstract
In old deep abandoned mines, the problem of separation of the layers of a
different nature needs to be solved. The problem discussed in this paper relates
to mines situated near Prague, capital of the Czech Republic and is concerned
with a separation of two kinds of underground water, one being salt (saline) and
the other sweet (fresh) water. The layer of the sweet water is positioned at
approximately 200 m below the surface, then there was originally a layer of
watertight clay (hydrogeological insulator) and from some 300 m downwards,
salt water occurs. A problem arose when the shafts, at a depth of 1000 m, have
been abandoned due to canceling the mine workings. During mining, pumps
were used and no permeability was enabled. Since the mining has stopped, there
is no reason to continue pumping and the danger of mixing both kinds of water
has occurred. It was decided, in order not to damage the sweet water which is
also used for wells and subsoil irrigation, that a stopper should be added into the
clay layers to suppress any possibility of mixing both kinds of water. The
problem then was oriented to answer several questions. One of the most
important that was put forward was on the relationship between permeability
coefficients and the thickness of the stopper. Another one was concerned with
the optimization of expenses involving the required permeability, expressed in
terms of economic indicators, the thickness depending on expenses, etc. As a
numerical model has been prepared and it was necessary to feed it by reasonable
input data, a scale model from physically equivalent materials was created and
tested. The mutual influence of both models, mathematical and experimental,
offered a very powerful tool for well-prepared reports on how the stopper should
be constructed.
Keywords: scale modeling, boundary element method, leakage problem.
Keywords
scale modeling, boundary element method, leakage problem.
Related Book
Other papers in this volume
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