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CHANGE IN THE PARAMETERS
OF WATER FILTRATION AROUND
MINE WORKINGS IN THE AREA OF INFLUENCE OF TECTONIC FAULTS
Y.O. Vynohradov1
1Institute for Physics of Mining Processes
of the National Academy of Sciences of Ukraine, Dnipro, Ukraine
Corresponding author:
e-mail: my_pochta_1r@ukr.net
Physical and
technical problems of mining production, 2021, (23), 108-117.
https://doi.org/10.37101/ftpgp23.01.008
full
text (pdf)
ABSTRACT
Purpose. The purpose of the work is
research of the water inflow
into the mine working that driving in difficult hydrogeological conditions at the crossing
of tectonic displacement.
Methods. A method
for studying the state of
layered rocks with a mine working in the presence of watered layers in its
vicinity, previously developed by the author, as well as
the finite element method were used to
solve the problem of water filtration in a deformable rocks.
Findings. In
this work, the problem of water inflow
reduction in Ukrainian coal mines, which are distinguished by difficult hydrogeological conditions, was considered. A numerical study of the change
in water inflow into a mine working when it crosses
a tectonic fault was carried out. The calculation
of stress fields, zones with inelastic deformations and coefficients of permeability, which depend on the
stress state and takes into
account tectonic and natural permeability of the rocks, was performed. The results of calculating the water pressure
and water inflow into the mine working
in all considered cases are presented in the article.
Analysis of the calculated data showed that a disturbed area, which covered water-bearing ricks, was formed in the
roof of the mine working
with the frame support. Within this area, water can move towards
the contour of the mine
working. The filtration permeability of the host
rocks increases significantly when the mine face
approaches the tectonic disturbance. The flow rate
of water reaches critical values.
Originality. For
the first time, the modelling
of water inflows into the mine workings
in the zone of influence
of tectonic fault was performed.
It is shown that when the mine
working approaches the fault, the processes of deformation and destruction of the host
rocks are activated and, with time, capture the adjacent aquifers. Then the flow
of water into the working
from these aquifers begins, and the frame
support is not able to
contain these processes.
Practical implications. The
developed mathematical model of the
coupled processes of deformation of rocks with
aquifers and water filtration can be used
to study water inflows in various geological conditions.
Keywords: water inflow
into mine working, rock permeability, water filtration, numerical simulation
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