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Geomechanical evaluation of the backfilling massif influence on the gate
road stability while thin coal seam mining
M.V. Petlovanyi1*,
D.S. Malashkevych1, K.S. Sai1
1Dnipro University of
Technology, Dnipro, Ukraine
*Corresponding author:
e-mail: petlyovany@ukr.net
Physical and technical
problems of mining production, 2022, (24), 53-66.
https://doi.org/10.37101/ftpgp24.01.005
full
text (pdf)
ABSTRACT
Purpose. The investigation
of the influence formation rock backfilling massif into longwall gob area
on the geomechanical situation of the rock massif around the gate road.
Methods. Numerical modeling
using the finite element method by applying the SolidWorks software was
used to achieve the goal. The geomechanical situation around the gate road
which is reused, was studied under traditional mining technology with full
roof collapse behind the longwall face with protective construction and
mining technology with gob backfilling. The geomechanical assessment was
provided based on the study of the vertical stress component.
Findings. The geomechanical
models for the study of the stress state of the massif around the gate
roads in the case of comparative variants of working out the coal seam are
substantiated. The formation of the backfilling massif in comparison with
the variants “full collapse + protective construction” significantly
reduces the amount of tensile stresses in the roof of the gate road,
tensile stresses in the floor of gate road, and the amount of stresses in
the roof and floor above the protective construction was established.
During the formation of the backfilling massif, the size of the unloading
zone in the rocks of the roof and floor of the gate road and the size of
the zone of compressive stresses in the rocks above and below the
protective construction significantly increases to the level of the
undisturbed massif was obtained.
Originality. The features of
the nature of the distribution stresses in the rock massif under the
formation of the rock backfilling are revealed, which indicates more
favorable conditions for maintaining gate road behind the stope than the
variant with full caving and the protective construction.
Paratactical
implication. The formation of rock backfilling massif in the mined-out area
makes it possible to reduce the intensity of rock pressure and keep the
gate roads in a satisfactory condition for its reuse.
Keywords: gate road,
geomechanical model, numerical modelling, stresses, rock massif,
backfilling massif, full caving, protective construction
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