Study on mechanical properties and acoustic emission characteristics of concrete-high water composites under uniaxial compression
Frontiers in Earth Science,
Год журнала:
2025,
Номер
13
Опубликована: Апрель 9, 2025
Under
complex
stress,
a
rigid
filling
body
can
easily
cause
the
shear
failure
of
gob-side
entry
retaining
(GSER)
roof,
and
flexible
serious
deformation
roadway
side.
The
combined
with
soft
upper
lower
respond
to
needs
support
strength
GSER.
In
this
paper,
uniaxial
compression
test
acoustic
emission
(AE)
characteristic
concrete-high
water
composite
(CHWC)
specimens
different
height
ratios
(Height
=
High
layer
height/CHWC
height)
were
performed
explore
influence
ratio
on
CHWC
specimens.
results
show
that
when
is
10%
20%,
stress-strain
curve
has
secondary
compaction,
elastic,
plastic
stages.
peak
compressive
negatively
correlated
high
positively
concrete
layer.
strain
increases
first
then
declines
increase
ratio.
When
≤20%,
plays
major
role
in
bearing
capacity.
about
224.4%
348%
uttermost
pure
specimen
(the
same
composition
concrete).
≥30%,
overall
structure
gradually
fails
after
instability
layer,
stratification
give
full
play
role.
research
provide
reference
for
applying
technology
Язык: Английский
Energy absorption and failure behavior of honeycomb structure scaffold reinforced cementitious composites made of different materials
Construction and Building Materials,
Год журнала:
2025,
Номер
476, С. 141309 - 141309
Опубликована: Апрель 14, 2025
Язык: Английский
Effect of 3D-printed polymer with negative Poisson's ratio structure on the mechanical characteristics of cemented tailings backfill
Case Studies in Construction Materials,
Год журнала:
2025,
Номер
unknown, С. e04665 - e04665
Опубликована: Апрель 1, 2025
Язык: Английский
Loading directionality of single-through fissure effects on mechanical properties of grouted rock
Physics of Fluids,
Год журнала:
2025,
Номер
37(5)
Опубликована: Май 1, 2025
Grouting
reinforcement
of
rock
masses
containing
numerous
joints
and
fissures
is
significant
for
ensuring
the
safety
deep
mining
underground
structures.
To
quantify
influence
fissure
loading
directionality
on
mechanical
properties
grouted
rocks,
Brazilian
splitting
tests
rocks
were
conducted
with
acoustic
emission
digital
image
correlation
monitoring.
A
corresponding
three-dimensional
discrete
element
model
was
constructed
to
reproduce
crack
force
chain
evolution
laws
during
process
in
tests.
The
failure
mechanism
under
different
angles
between
direction
through
analyzed.
results
show
that
initially
increase
then
decrease
as
angle
increases,
transitions
from
being
dominated
by
interface
fracture
medium
splitting.
strain-concentrated
zones
all
are
located
along
middle
part
specimen.
As
zone
shows
a
inclination.
When
small,
cracks
tend
extend
propagate
more
readily
at
interface.
number
induced
tensile-shear
gradually
decreases.
main
load-bearing
chains
also
an
offset,
which
highly
consistent
evolution.
distribution
high-strength
distinctly
directional,
tendency
aligning
strain
field.
specimen
exhibits
higher
when
uniform
larger.
Язык: Английский
Effect of CNT concentration on mechanical properties and microstructure evolution of grout
Frontiers in Materials,
Год журнала:
2025,
Номер
12
Опубликована: Май 14, 2025
In
order
to
elucidate
the
mechanism
of
carbon
nanotubes
(CNTs)
in
cementitious
materials
and
their
effects
on
microstructural
mechanical
properties,
this
study
combines
in-house
experiments
with
PFC
2D
particle
flow
numerical
simulations
systematically
analyse
macromicro-mechanical
behaviours
grouted
nodular
bodies
under
different
CNTs
concentrations.
Uniaxial
compression
tests
were
carried
out
specimens
constructed
from
crushed
aggregate
a
fractal
dimension
2.415,
results
showed
that
incorporation
significantly
enhanced
compressive
strength
strain
capacity
nodules,
optimal
performance
at
concentration
0.05%
CNTs,
peak
increased
by
14.9%
9.7%
compared
those
unincorporated
specimens,
respectively.
Numerical
simulation
maximum
deviation
between
test
was
2.01%
2.96%,
respectively,
which
verified
reliability
model.
Microanalysis
optimised
crack
extension
path
force
chain
distribution
enhancing
bonding
cemented
particle-aggregate
interface,
inhibited
penetration
shear
cracks,
while
too
high
(e.g.,
0.15%)
weakened
interface
due
agglomeration
exacerbated
rupture
structural
instability.
This
reveals
regulation
properties
rock
body,
provides
theoretical
basis
for
efficient
reinforcement
surrounding
engineering.
Язык: Английский
Theory and numerical simulation study on the plastic slip failure mechanism of multi-layered coal seam Floors-A case analysis
Frontiers in Earth Science,
Год журнала:
2025,
Номер
13
Опубликована: Апрель 16, 2025
Coal
seam
mining
induces
disturbances
in
underground
floors,
leading
to
plastic
failure,
which
presents
significant
safety
risks,
particularly
areas
with
underlying
pressurized
water.
Accurately
assessing
the
maximum
depth
of
such
floor
failure
is
crucial
for
ensuring
safe
operations.
This
study
investigates
evolution
apparent
resistivity
4,301
working
face
using
network
parallel
electrical
method.
The
observed
was
found
be
19.3
m.
Based
on
these
measurements,
slip
theory
a
homogeneous
rock
layer
applied,
incorporating
parameters
as
burial
and
height.
Five
mechanical
models
multi-layer
composite
floors
were
developed,
calculated
18.26
also
explores
impact
factors
height,
depth,
internal
friction
angle
layers
depth.
results
demonstrate
that
exhibit
23.1%
reduction
average
compared
floors.
Numerical
simulations
confirmed
under
disturbance
19.2
m,
shear
identified
predominant
mode.
findings
from
theoretical
analysis,
numerical
simulations,
field
measurements
align
closely,
validating
applicability
research
provides
critical
support
operations
coal
seams
above
confined
aquifers
effective
water
control
strategies.
Язык: Английский
Water Inrush Mechanism During Mining Adjacent to Large Water-Conducting Faults
Water,
Год журнала:
2025,
Номер
17(10), С. 1508 - 1508
Опубликована: Май 16, 2025
In
mining
operations,
the
rock
mass
located
between
water-conducting
fault
fracture
zone
and
waterproof
protective
coal
column
is
highly
susceptible
to
damage,
which
may
result
in
sudden
water
inrush
disasters.
This
paper
first
employs
indoor
experiments
on-site
sample
analysis
determine
macroscopic
mechanical
parameters
of
rocks
masses,
as
well
microscopic
block
contacts.
The
seepage
evolution
mechanisms
mining-induced
adjacent
major
faults
were
analyzed
utilizing
discrete
element-fluid
coupling
theory
Universal
Distinct
Element
Code
(UDEC).
results
identified
three
primary
pathways
for
hazards
caused
by
mining:
calculated
stress
field
indicated
that
formation
water-inrush
channels
was
determined
seam
mining.
Different
columns
set
up
geological
conditions
under
study.
Additionally,
a
“claw-shaped”
detection
flow
monitoring
method
has
been
proposed
small
faults.
These
findings
are
important
provide
valuable
guidance
understanding
managing
operations
near
Язык: Английский