Energy Science & Engineering,
Journal Year:
2024,
Volume and Issue:
12(11), P. 5316 - 5327
Published: Nov. 1, 2024
ABSTRACT
The
severe
deformation
of
the
surrounding
rock
coal
floor
in
Shanghaimiao
mining
area
is
affecting
safe,
efficient
production
mine
wells
this
region.
In
study,
heave
mechanism
and
control
roadway
were
investigated
through
laboratory
experiments,
field
research,
theoretical
analysis,
numerical
simulation,
on‐site
testing.
results
showed
that
main
reason
for
serious
damage
to
was
low
strength
floor,
exacerbated
by
support
strength,
hydraulic
effects,
impact.
A
mechanical
model
asymmetric
established,
it
found
stability
positively
correlated
with
type,
stress
concentration
coefficients
on
two
sides
roadway,
burial
depth,
whereas
negatively
cohesive
force
internal
friction
angle
mass.
Expressions
upward
resultant
R
K
K′
both
derived.
a
FLAC3D
simulation
analysis
peak
front
working
face
36
MPa,
factor
3.7.
After
reinforced,
remarkably
reduced,
maximum
value
approximately
600
mm,
became
somewhat
asymmetric.
Finally,
double‐seal
floor‐reinforcing
“inverted
arch”
technique
proposed
tested
on‐site.
new
system
could
efficiently
stably
roadway.
AIP Advances,
Journal Year:
2024,
Volume and Issue:
14(9)
Published: Sept. 1, 2024
The
acoustic
emission
(AE)
characteristic
signal
can
reveal
the
mechanical
properties
of
rock
materials
and
development
characteristics
internal
microcracks.
Rocks
with
different
mineral
produce
AE
signals
during
fracture.
This
study
selected
variable
metagabbros
varying
feldspathic
for
tests
under
splitting
load.
results
demonstrated
that
ringing
counts
Brazilian
fracture
metagabbro
were
closely
correlated
content
felsic
minerals.
cumulative
count
feldspar
nondevelopment
exceeded
250
000,
while
those
did
not
reach
200
000.
As
increases,
exhibit
an
increasing
trend
in
high-energy
(1e6–+∞
aJ)
high-amplitude
(90–100
dB)
intervals.
With
minerals,
mode
gradually
changed
from
shear
failure
to
tensile
failure.
higher
stress
level
corresponding
maximum
fractal
dimension,
greater
energy
released
by
failure,
more
severe
damage.
is
great
significance
revealing
mechanism
rupture.
Lithosphere,
Journal Year:
2024,
Volume and Issue:
2024(3)
Published: Sept. 10, 2024
Abstract
Water
and
sand
inrush
pose
significant
threats
to
underground
geotechnical
engineering,
including
shallow
buried
resource
extraction
tunnel
construction.
To
understand
the
mechanisms
behind
these
phenomena,
a
mud
collapse
accident
in
Chaider
Coal
Mine
was
comprehensively
investigated
through
field
exploration
laboratory-based
testings.
Using
numerical
simulation
experiments,
we
analyzed
failure
patterns
seepage
characteristics
of
overlying
strata
steeply
inclined
coal
seam
mining
under
various
working
conditions.
We
established
structural
instability
model
for
water
identified
critical
conditions
occurrence.
Our
research
indicates
that
backfill
surface
pit
provided
substantial
material
source
accident.
The
overall
destabilization
top
coal,
due
its
insufficient
thickness
strength,
created
pathway
collapse.
Furthermore,
frequent
rainfall
during
flood
season
inadequate
arrangement
pumping
equipment
acted
as
triggers
sudden
Preventative
measures,
such
limiting
height,
enhancing
shear
strength
altering
face
layout,
can
effectively
control
development
height
water-conducting
fracture
zone.
Additionally,
timely
evacuation
lowering
aquifer
level,
weakening
effect
area,
reducing
moisture
content
bottom
soil,
improving
mitigate
accidents
areas
open-pit
mines.
Energy Science & Engineering,
Journal Year:
2024,
Volume and Issue:
12(11), P. 5316 - 5327
Published: Nov. 1, 2024
ABSTRACT
The
severe
deformation
of
the
surrounding
rock
coal
floor
in
Shanghaimiao
mining
area
is
affecting
safe,
efficient
production
mine
wells
this
region.
In
study,
heave
mechanism
and
control
roadway
were
investigated
through
laboratory
experiments,
field
research,
theoretical
analysis,
numerical
simulation,
on‐site
testing.
results
showed
that
main
reason
for
serious
damage
to
was
low
strength
floor,
exacerbated
by
support
strength,
hydraulic
effects,
impact.
A
mechanical
model
asymmetric
established,
it
found
stability
positively
correlated
with
type,
stress
concentration
coefficients
on
two
sides
roadway,
burial
depth,
whereas
negatively
cohesive
force
internal
friction
angle
mass.
Expressions
upward
resultant
R
K
K′
both
derived.
a
FLAC3D
simulation
analysis
peak
front
working
face
36
MPa,
factor
3.7.
After
reinforced,
remarkably
reduced,
maximum
value
approximately
600
mm,
became
somewhat
asymmetric.
Finally,
double‐seal
floor‐reinforcing
“inverted
arch”
technique
proposed
tested
on‐site.
new
system
could
efficiently
stably
roadway.
