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SUBSTANTIATION OF THE
MODEL FOR INVESTIGATION OF PARAMETERS OF PROTECTION OF MAIN SLOPE PRODUCTS
IN UNLOADED MOUNTAIN PRESSURE ZONES
O.S. Yanzhula1, M.V. Golovin1, O.Y. Pidgurna1,
V.V. Nazimko2, L.M. Zakharova2*, O.B. Kusen2
1PJSC “Donetsksteel “Iron and steel works”
Pokrovsk, Ukraine
2Institute for Physics of Mining Processes
of the National Academy of Sciences of Ukraine, Dnipro, Ukraine
*Corresponding author:
mila2017ma@gmail.com
Physical and technical problems of mining production, 2021, (23),
40-53.
https://doi.org/10.37101/ftpgp23.01.003
full
text (pdf)
ABSTRACT
Purpose. Estimation
of redistribution of rock pressure
around the working formation.
Methods. During
the project of planning mining works the data of
mine instrumental observations of shifts around preparatory workings with the help
of contour and depth benchmarks,
monitoring of dynamics of growth of pressure
of collapsed rocks and forged
stratum on the bottom of the spent
coal seam and final differences
were used.
Findings. A computer model has been
substantiated to simulate relevant parameters of panel extraction layout and determine technology of the main
entries maintenance in the stress
relief zone. The model was
based on the final difference
scheme. Mohr-Coulomb constitutive model has been selected
to simulate nonlinear behavior of surrounding rock mass. Bulk and shear
modulus were used to mimic
elastic behavior of the rocks.
To simulate irreversible actions of the rock
mass, cohesion, angle of internal
friction, tension limit and angle
of dilation were employed as initial data. A special sub-model was developed to account for physical process of immediate roof and floor
interaction behind the moving longwall. The depth of mining
was 1100 m whereas
the total height of the
model was 1500 m, because 400 m undermined
strata was accounted for. Therefore, top boundary of the model was
free, lateral sides were constrained from the normal displacements, and bottom of the
model was fixed.
Practical implications. Parameters of the model were
verified by comparison of the abutment zone with that
recommended by regulatory documents. Dynamic of ground pressure in the gob
behind the moving longwall face was matched
the results of the experimental
monitoring of the caved strata
pressure. Elastic resilience of the undermined strata was compared with measured in situ at the
depth about one kilometer. Step of the
main roof weighting was examined by comparison with measured in a real coal mine.
The results of such verification
demonstrated that parameters of the model were
calibrated properly. This model is planned to involve in the process
of examination of the mining
layout at the prospective block 11 at “Pokrovs’ke” coal mine, Ukraine, Donbass region.
Keywords: mining layout, ground pressure, stress relief, gate road , geomechanic model
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