Progressive damage and permeability characteristic of gas-bearing coal–rock combination under triaxial cyclic loading
Physics of Fluids,
Год журнала:
2025,
Номер
37(2)
Опубликована: Фев. 1, 2025
It
is
crucial
to
study
the
damage
and
failure
characteristics
of
gas-bearing
coal–rock
combination
(GBCRC)
structures
under
cyclic
loading
for
prevention
management
gas
composite
dynamic
disasters.
In
order
analyze
progressive
permeability
evolution
behavior
GBCRC
specimens
subjected
triaxial
loading–unloading
(TCLU).
Acoustic
emission
(AE)–seepage–damage
TCLU
tests
were
performed
on
with
various
confining
pressures
using
rock
test
system.
The
findings
reveal
that
improving
pressure
limits
initiation
propagation
cracks,
increasing
characteristic
stress
value
specimen.
Simultaneously,
its
energy
storage
limit
improved.
elevated
hinders
closure
specimen's
internal
crack,
while
simultaneously
accelerating
rate
also,
drops
as
increases.
absolute
recovery
in
initially
declines
thereafter
rises
progressively.
sensitivity
reduces
progressively
a
rise
number
cycles.
production
spread
cracks
are
intimately
linked
generation
AE
signals,
will
be
impacted
by
cracks.
At
same
time,
one
driving
forces
crack
propagation,
dissipation
also
indirectly
affects
change
signal
permeability.
behaviors
can
fully
reflected
signal,
dissipation,
Язык: Английский
Acoustic monitoring and structural damage evaluation of tensile fracture in various materials using optical fiber sensing
Physics of Fluids,
Год журнала:
2025,
Номер
37(2)
Опубликована: Фев. 1, 2025
Acoustic
emission
(AE)
technology
is
a
crucial
approach
for
ensuring
the
safe
operation
and
maintenance
of
underground
spaces.
Traditional
mechanical
piezoelectric
AE
sensors
often
fail
to
meet
monitoring
requirements
complex
environments.
In
this
paper,
novel
system
based
on
Michelson
interferometer
designed
applied
monitor
tensile
fracture
processes
common
materials
(coal,
concrete,
quartzite,
granite)
in
various
engineering
projects.
Signal
noise
reduction
feature
parameter
extraction
waveform
data
collected
by
optical
fiber
sensor
are
performed.
The
time
series,
frequency
domain
characteristics,
crack
modes
signals
were
analyzed,
precursor
characteristics
fractures
extracted.
results
indicate
that
possesses
high
sensitivity,
wide
band
response,
large
dynamic
range,
enabling
it
effectively
identify
primary
differences
generated
rock
experiments.
count
energy
evolution
patterns
good
agreement
with
material
stress
curves,
quantifying
damage
processes.
proportional
distribution
shear
cracks
different
was
successfully
classified
using
waveforms.
Based
changing
trends
b-value,
variance,
autocorrelation
coefficient,
failure
early
warning
mechanism
constructed,
categorizing
warnings
into
three
levels:
trend
warning,
initial
critical
warning.
This
study
provides
new
effective
method
safety
development
deep
engineering.
Язык: Английский
Influence of Length-to-Diameter Ratio on Static and Dynamic Behavior of Rocks: A Review and Perspective
Materials,
Год журнала:
2025,
Номер
18(5), С. 1109 - 1109
Опубликована: Фев. 28, 2025
The
size
effect
in
rock
mechanics
has
long
been
a
challenging
issue,
with
the
length-to-diameter
(L/D)
ratio
emerging
as
critical
factor
that
received
substantial
attention.
Understanding
L/D
is
essential
for
ensuring
accuracy
and
reliability
of
laboratory
tests.
This
paper
presents
comprehensive
review
studies
on
rocks,
examining
its
influence
static
dynamic
mechanical
behavior.
analysis
encompasses
effects
specimen
properties,
energy
characteristics,
failure
modes,
integrating
findings
from
theoretical
research
experimental
studies.
results
reveal
varies
significantly
under
different
external
loading
conditions.
Despite
extensive
research,
mechanisms
underlying
remain
ambiguous,
unified
conclusion
yet
to
be
reached.
highlights
importance
selecting
appropriate
dimensions
tests
emphasizes
need
further
investigation
into
advance
understanding
mechanics.
Язык: Английский
Investigation of static mechanical characteristics and numerical simulation of fractal gangue cemented backfill materials
Physics of Fluids,
Год журнала:
2024,
Номер
36(10)
Опубликована: Окт. 1, 2024
This
study
investigated
the
static
mechanical
responses
of
gangue
cemented
backfill
materials
(GCBM)
with
aggregate
particle
size
distribution
(APSD)
satisfied
fractal
grading
theory.
The
recycling
in
GCBM
alleviates
accumulation
pollution
and
improves
mining
production
efficiency.
Macroscopically,
uniaxial
compression
experiments
regarding
various
loading
strain
rates
(ε̇)
on
specimens
(GCBS)
were
conducted.
Acoustic
emission
monitoring
digital
image
correlation
technique
employed
to
reveal
crack
activities
field
evolution
real
time.
Microscopically,
scanning
electron
microscopy
numerical
considering
APSD
utilized
analyze
microstructure
damage
process.
deterioration
mechanisms
quantified
number
cracks
explored
at
micro
level.
conclusions
are
as
follows:
(1)
axial
stress
(σ)
increased
dimension
(D)
ε̇.
For
same
σ,
cumulative
AE
counts
decreased
increasing
ε̇
D.
(2)
main
failure
mode
GCBS
under
was
tensile
failure,
exhibiting
initiating
bonding–aggregate
interface.
(3)
increase
proportion
fine
contributed
optimization
microstructures
(4)
An
improved
synergistic
load-bearing
capacity
between
cementing
mediums,
leading
an
enhancement
σ.
Язык: Английский