Mining of Mineral Deposits,
Год журнала:
2023,
Номер
17(2), С. 9 - 19
Опубликована: Июнь 30, 2023
Purpose.
Creating
a
generalized
algorithm
to
account
for
factors
(coal
seam
thickness,
enclosed
rock
mechanical
properties,
the
dimension
and
bearing
capacity
of
artificial
support
patterns)
causing
gateroad
state
under
effect
longwall
face
goaf.
Methods.
The
assessment
stability
is
based
on
numerical
simulation
stress-strain
(SSS).
finite
element
method
used
find
out
changes
in
SSS
surrounding
rocks
at
various
stages
mining.
elastic-plastic
constitutive
model
Hoek-Brown
failure
criterion
implemented
codes
RS2
RS3
(Rocscience)
are
applied
determine
displacements
dependently
coal
strength,
width
strength
(a
packwall
comprised
hardening
mixture
“BI-lining”).
To
specify
properties
material
series
experimental
tests
were
conducted.
A
computational
experiment
dealing
with
81
combinations
affecting
was
carried
estimate
roof
slag
floor
heaving
behind
face.
group
data
handling
(GMDH
)
employed
generalize
relationships
between
factors.
Findings.
roof-to-floor
closure
has
been
determined
intersection
goaf
packwall,
material.
It
revealed
that
gains
value
30
MPa
3rd
day
from
its
beginning
use
which
fully
corresponding
requirements
protective
capacity.
possibility
using
untreated
mine
water
liquefy
proved,
allows
simplifying
optimizing
solute
mixing
pumping
technology.
Originality.
This
study
contributes
improving
understanding
influence
underground
mining
operations
highlights
importance
utilizing
simulations
designs.
impact
each
factor
resulting
variable
(decrease
cross-section
gate
road
by
height)
combinatorial
structural
identification
estimated
as
follows:
48%,
thickness
25%,
enclosing
23%,
4%.
Practical
implications.
findings
provide
stakeholders
technique
reasonable
parameters
systems,
predictive
developed
can
be
mitigate
potential
instability
issues
excavations.
results
have
implications
similar
geological
settings
valuable
design
optimization
other
regions.
Sensors,
Год журнала:
2022,
Номер
22(16), С. 6121 - 6121
Опубликована: Авг. 16, 2022
To
improve
the
monitoring
of
electrical
power
grid,
it
is
necessary
to
evaluate
influence
contamination
in
relation
leakage
current
and
its
progression
a
disruptive
discharge.
In
this
paper,
insulators
were
tested
saline
chamber
simulate
increase
salt
on
their
surface.
From
time
series
forecasting
current,
possible
development
fault
before
flashover
occurs.
for
complete
evaluation,
long
short-term
memory
(LSTM),
group
method
data
handling
(GMDH),
adaptive
neuro-fuzzy
inference
system
(ANFIS),
bootstrap
aggregation
(bagging),
sequential
learning
(boosting),
random
subspace,
stacked
generalization
(stacking)
ensemble
models
are
analyzed.
results
best
structure
models,
hyperparameters
evaluated
wavelet
transform
used
obtain
an
enhanced
model.
The
contribution
paper
related
improvement
well-established
using
transform,
thus
obtaining
hybrid
that
can
be
several
applications.
showed
leads
all
especially
ANFIS
model,
which
had
mean
RMSE
1.58
×10-3,
being
model
result.
Furthermore,
standard
deviation
2.18
×10-19,
showing
stable
robust
application
under
study.
Future
work
performed
other
components
distribution
grid
susceptible
because
they
installed
outdoors.
Mining of Mineral Deposits,
Год журнала:
2023,
Номер
17(2), С. 9 - 19
Опубликована: Июнь 30, 2023
Purpose.
Creating
a
generalized
algorithm
to
account
for
factors
(coal
seam
thickness,
enclosed
rock
mechanical
properties,
the
dimension
and
bearing
capacity
of
artificial
support
patterns)
causing
gateroad
state
under
effect
longwall
face
goaf.
Methods.
The
assessment
stability
is
based
on
numerical
simulation
stress-strain
(SSS).
finite
element
method
used
find
out
changes
in
SSS
surrounding
rocks
at
various
stages
mining.
elastic-plastic
constitutive
model
Hoek-Brown
failure
criterion
implemented
codes
RS2
RS3
(Rocscience)
are
applied
determine
displacements
dependently
coal
strength,
width
strength
(a
packwall
comprised
hardening
mixture
“BI-lining”).
To
specify
properties
material
series
experimental
tests
were
conducted.
A
computational
experiment
dealing
with
81
combinations
affecting
was
carried
estimate
roof
slag
floor
heaving
behind
face.
group
data
handling
(GMDH
)
employed
generalize
relationships
between
factors.
Findings.
roof-to-floor
closure
has
been
determined
intersection
goaf
packwall,
material.
It
revealed
that
gains
value
30
MPa
3rd
day
from
its
beginning
use
which
fully
corresponding
requirements
protective
capacity.
possibility
using
untreated
mine
water
liquefy
proved,
allows
simplifying
optimizing
solute
mixing
pumping
technology.
Originality.
This
study
contributes
improving
understanding
influence
underground
mining
operations
highlights
importance
utilizing
simulations
designs.
impact
each
factor
resulting
variable
(decrease
cross-section
gate
road
by
height)
combinatorial
structural
identification
estimated
as
follows:
48%,
thickness
25%,
enclosing
23%,
4%.
Practical
implications.
findings
provide
stakeholders
technique
reasonable
parameters
systems,
predictive
developed
can
be
mitigate
potential
instability
issues
excavations.
results
have
implications
similar
geological
settings
valuable
design
optimization
other
regions.
