Research and applications of the cross-fusion mechanism of high gas thick coal seam influenced by dip angle
International Journal of Mining Science and Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Язык: Английский
Study on the failure mechanism of overlying strata under hydraulic fracturing in coal seams
Journal of Applied Geophysics,
Год журнала:
2025,
Номер
unknown, С. 105725 - 105725
Опубликована: Апрель 1, 2025
Язык: Английский
Dangerous Area Evolution and Coal Spontaneous Combustion Prevention Method Induced by Air Leakage in Goaf of Ultra-Long Working Face
Combustion Science and Technology,
Год журнала:
2025,
Номер
unknown, С. 1 - 21
Опубликована: Янв. 4, 2025
Coal
spontaneous
combustion
in
goaf
seriously
affects
the
safety
of
mine
production,
and
air
leakage
is
one
prerequisites
for
coal
combustion.
Taking
ultra-long
working
face
with
a
length
410
m
as
an
example,
due
to
insufficient
compaction
degree
goaf,
high
development
large-scale
cracks,
large
flow
pressure
difference
between
intake
return
air,
law
not
clear,
risk
broken
residual
increases.
Based
on
physical
mechanical
parameters
rock,
this
paper
studies
plastic
failure
fracture
under
various
stress
disturbances
faces.
The
laws
gas
migration
was
studied
by
means
field
test
numerical
simulation.
theory
coal-oxygen
composite
dangerous
areas
different
mining
sequence
evolution
were
determined.
distribution
danger
zone
comprehensive
fire
prevention
extinguishing
technology
nitrogen
injection
inerting,
plugging
reduction
applied
demonstration,
application
effect
verified.
research
results
show
that
range
overlying
strata
presents
"saddle
shape."
permeability
porosity
increase
gradually
from
middle
surrounding
direction,
showing
"O-ring"
distribution.
main
channels
are
concentrated
at
tunnel
corner
160–200
face.
sinks
located
distance
20–80
along
dip
direction
face,
respectively.
average
268
m3/min
153
m3/min,
maximum
width
during
dynamic
advancement
107
m.
Through
techniques
such
inerting
filling
high-molecular-weight
gel
sealing
reduction,
control
faces
sequences
corresponding
engineering
backgrounds
effectively
ensured.
Язык: Английский
Igneous Rock Occurrence Prediction Based on Seismic Information Inversion and Its Influence Analysis During Coal Mining: A Case Study in Huaibei Coalfield
Applied Sciences,
Год журнала:
2025,
Номер
15(4), С. 2110 - 2110
Опубликована: Фев. 17, 2025
Overlying
hard
and
thick
igneous
rocks
pose
numerous
potential
safety
hazards
during
the
exploitation
of
coal
resources.
Identifying
spatial
distribution
analyzing
their
impact
on
mining
are
a
primary
research
concern.
In
this
study,
mine
was
investigated
in
depth.
Initially,
based
seismic
information,
authors
predicted
occurrence
conditions
measure
strata.
Subsequently,
two
models
were
developed
via
UDEC
software4.00:
one
with
layers
other
without.
Using
simulation
results,
change
law
stress,
roof
abscission
layer,
strata
subsidence
overburden
face
advancement
analyzed.
Through
comparison
hazard-causing
mechanism
intrusion
discussed.
Consequently,
is
crucial
for
predicting
hazards,
inversion
method
can
be
considered
an
effective
tool
evaluating
overlying
Язык: Английский
Investigating the Evolution Law and Fracture Mechanism of Overlying Coal-Bearing Strata Caused by Shallow Multi-Seam Mining in a Gully Area
Applied Sciences,
Год журнала:
2025,
Номер
15(5), С. 2649 - 2649
Опубликована: Март 1, 2025
Compared
with
single
coal
seam
mining,
the
stratum
damage
induced
by
shallow
multi-seam
mining
is
more
severe
and
poses
a
risk
of
mine
disasters
that
threaten
safety
personnel.
In
order
to
reveal
characteristics
mechanism
strata
damage,
in
this
paper,
field
measurement,
numerical
simulation
mechanical
analysis
are
used
study
development
dynamic
evolution
laws
overburden
explain
water-conducting
fracture
zone
(WCFZ)
surface
cracks.
The
height
WCFZ
exceeds
31.68,
which
higher
than
empirical
value
area.
There
self-healing
activation
for
fissures
related
hinge
rotation
deflection
inclined
structure.
However,
maximum
subsidence
coefficient
crack
angle
does
not
alter,
but
complexity
activity
increases.
law
closely
breaking
key
strata,
while
controlled
form
block
instability
topography.
addition,
horizontal
staggered
model
conductive
reducing
constructed,
method
has
been
proposed
lessen
landslides
brought
on
Язык: Английский
Field and numerical investigations on linkage failure of the main roof and pumpable supports in the pre-excavation recovery room
Engineering Geology,
Год журнала:
2025,
Номер
unknown, С. 108075 - 108075
Опубликована: Апрель 1, 2025
Язык: Английский
Research on Section Coal Pillar Deformation Prediction Based on Fiber Optic Sensing Monitoring and Machine Learning Algorithms
Applied Sciences,
Год журнала:
2024,
Номер
14(20), С. 9347 - 9347
Опубликована: Окт. 14, 2024
The
mining
face
under
the
close
coal
seam
group
is
affected
by
superposition
of
concentrated
stress
overlying
residual
diagonally
intersecting
pillar
and
stress,
which
can
easily
cause
instability
damage
section
pillars
during
process
back
to
downward
face.
Additionally,
traditional
methods
monitoring
such
as
numerical
simulation,
drilling
peeping,
acoustic
emission
fail
realize
real-time
accurate
deformation
internal
pillars.
introduction
drill-hole-implanted
fiber-optic
grating
method
for
whole
area
inside
pillar,
solves
short
board
problem
monitoring.
However,
disturbed
external
environment,
especially
sensitive
background
noise
complex
underground
environment.
Therefore,
taking
live
chicken
rabbit
well
Shaanxi
Daliuta
Coal
Mine
engineering
background,
ensemble
empirical
modal
decomposition
(EEMD)
introduced
primary
reduction
signal
reconstruction
threshold
determination
(DE)
algorithm,
then
singular
matrix
(SVD)
secondary
reduction.
Finally,
a
machine
learning
algorithm
combined
with
prediction
fiber
strain
signals
in
zone,
DBO-LSTM-BP
constructed
model.
experimental
results
demonstrate
that
compared
other
two
models,
SNR
EEMD-DE-SVD-DBO-LSTM-BP
model
improved
0.8–2.3
dB
on
average,
accuracy
range
88–99%,
realizes
over-advanced
state
column
section.
Язык: Английский