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The method of
reducing water inflows into mine workings with using of combined frame-roof
bolting
O.P. Krukovskyi1,
Y.O. Vynohradov2
1M.S. Polyakov Institute of Geotechnical
Mechanics under the National Academy of Sciences of Ukraine, Dnipro,
Ukraine
2Branch for Physics of Mining Processes of the
M.S. Poliakov Institute of Geotechnical Mechanics the National Academy Sciences
of Ukraine, Dnipro, Ukraine
*Corresponding author:
e-mail: my_pochta_1r@ukr.net
Physical and technical
problems of mining production, 2022, (24), 32-40.
https://doi.org/10.37101/ftpgp24.01.003
full
text (pdf)
ABSTRACT
Purpose. Improvement
of the method of reducing water inflows into mine workings with using of
combined frame-roof bolting to ensure the stability of the mine workings,
waterproofing and protection against the collapse of wet contour rocks
inside the mine workings.
Methods. When solving the problem of water filtration in
deformed rock, the method of studying the state of a layered rock massif
with a mine working in the presence of water-saturated layers in its
vicinity, which was developed by the authors, as well as the finite element
method were used.
Findings. With the help of numerical methods, stress fields
and water inflows were calculated, on the basis of which the method of reducing water inflows into mine
workings with using of combined frame-roof bolting was developed.
The use of frame-roof bolting
is substantiated both in favourable conditions, in poorly watered host rocks
in mine workings with small water inflows, and in conditions of strongly
watered rocks, in mine workings with water inflows of more than 10 m3/h.
Therefore, frame-roof bolting
can be considered as the second line of defense, which should be used in the
presence of water-bearing rocks.
Originality. For the first time, a method of reducing water inflows into mine
workings with using of combined frame-roof bolting, namely steel
frames and nets together with steel-polymer rock bolts, was developed to
ensure the stability of mine workings, waterproofing and protection against
the collapse of wet contour rocks inside mine workings.
Practical implications. Application of the proposed
method will make it possible to obtain a significant economic effect due to
the reduction of costs for water pumping and repair work to restore mine
workings after emergency water inflows and when changing the frame to the
roof bolting.
Keywords: water inflow into mine working, rock permeability,
water filtration, numerical simulation
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