Journal of Sustainable Mining,
Journal Year:
2023,
Volume and Issue:
22(4), P. 308 - 315
Published: Oct. 30, 2023
In
Poland,
more
and
tunnels
are
being
built
using
mining
methods.
Mostly
ventilation
systems
described
for
already
commissioned.
There
few
examples
of
calculations
under
construction.
The
paper
shows
a
case
study
where
were
made
the
minimum
air
volume
flow
required
to
ventilate
tunnel
during
its
tunnelling
four
duct
systems.
first
system
used
two
separate
fans
with
1200
mm
diameter
line,
second
changed
line
1400
mm,
third
one
fan
lines
connected
in
parallel,
fourth
increased
mm.
Fan
power
requirements
determined
these
layouts.
cost
statement
that
it
is
advantageous
change
larger
–
reducing
total
by
about
10%.
With
assumed
electricity
prices,
favourable
variants
which
provided
difference
5%.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: March 27, 2024
Abstract
In
order
to
quantitatively
calculate
the
critical
depth
and
load
of
mines
affected
by
rock
burst,
achieve
effective
prevention
control
burst
in
coal
mines,
this
paper
proposes
a
mechanical
model
for
predicting
occurrence
mine
roadways
based
on
catastrophe
theory.
Additionally,
theoretical
calculation
formula
initiating
is
derived.
The
first
step
was
establish
analysis
model,
which
directly
correlated
with
in-situ
stress,
physical
characteristics
coal-rock
mass,
engineering
structural
parameters.
Following
this,
instability
criterion
derived
key
load-bearing
circle
within
surrounding
roadway.
final
step,
initiation
were
verified
25
distinct
China
that
prone
hazards.
research
results
demonstrate
discrepancy
between
theoretically
calculated
actual
measured
statistical
values
less
than
35%.
addition,
difference
determined
value
Pan
Yishan
32%.
Notably,
ratio
uniaxial
compressive
strength
mass
ranged
from
0.38
1.93.
This
aligns
empirical
data
occurrences,
as
set
out
classification
standards
masses.
These
outcomes
substantiated
practical
utility
proposed
theory,
thereby
laying
robust
groundwork
quantitative
burst.
Underground Space,
Journal Year:
2024,
Volume and Issue:
18, P. 273 - 294
Published: April 26, 2024
This
study
aims
to
predict
the
migration
time
of
toxic
fumes
induced
by
excavation
blasting
in
underground
mines.
To
reduce
numerical
simulation
and
optimize
ventilation
design,
several
back
propagation
neural
network
(BPNN)
models
optimized
honey
badger
algorithm
(HBA)
with
four
chaos
mapping
(CM)
functions
(i.e.,
Chebyshev
(Che)
map,
Circle
(Cir)
Logistic
(Log)
Piecewise
(Pie)
map)
are
developed
time.
125
simulations
computational
fluid
dynamics
(CFD)
method
used
train
test
models.
The
determination
coefficient
(R2),
variance
accounted
for
(VAF),
Willmott's
index
(WI),
root
mean
square
error
(RMSE),
absolute
percentage
(MAPE),
sum
squares
(SSE)
utilized
evaluate
model
performance.
evaluation
results
indicate
that
CirHBA-BPNN
has
achieved
most
satisfactory
performance
reaching
highest
values
R2
(0.9945),
WI
(0.9986),
VAF
(99.4811%),
lowest
RMSE
(15.7600),
MAPE
(0.0343)
SSE
(6209.4),
respectively.
wind
velocity
roadway
(Wv)
is
important
feature
predicting
fumes.
Furthermore,
intrinsic
response
characteristic
optimal
implemented
enhance
interpretability
provide
reference
relationship
between
features
design.
