Minerals,
Год журнала:
2024,
Номер
14(9), С. 917 - 917
Опубликована: Сен. 6, 2024
Layered
cemented
filling
leads
to
a
layered
composite
structure
of
tailings
backfill
(CTB)
composed
high-strength
top
and
bottom
layers,
as
well
low-strength
middle
layer.
To
solve
the
problem
low
mechanical
properties
layer
caused
by
filling,
this
study
proposes
concept
an
enhance
layer,
that
is,
is
added
weak
improve
its
overall
properties.
explore
characteristics
strength,
failure
modes,
energy
dissipation,
progressive
damage
stratified
(SCTB)
with
varying
structures,
uniaxial
compressive
tests
SCTB
specimens
layers
c/t
1:15,
1:10,
1:6,
height
proportions
0.1,
0.2,
0.3,
are
examined.
The
results
show
elastic
modulus
strength
(UCS)
samples
increase
ratio
cement-to-tailings
more
sensitive
than
ratio.
Moreover,
mainly
manifested
tensile
upper
lower
but
they
did
not
penetrate
entire
specimen.
propagation
cracks
limited
addition
have
stronger
plastic
deformation
ability,
large
part
all-strain
dissipated
in
shape
failure.
In
addition,
constitutive
model
for
has
been
developed.
reasonable
can
also
achieve
sufficient
compared
directly
increasing
CTB
while
reducing
cost
preparation.
This
approach
reduces
carbon
footprint
mining
industry
improved
stability
backfill.
provides
new
high-stage
subsequent
stope
backfilling.
findings
will
offer
guidance
design
method.
Case Studies in Construction Materials,
Год журнала:
2024,
Номер
21, С. e03450 - e03450
Опубликована: Июль 1, 2024
Alkaline
rice
straw
fibers
(ARSF),
as
a
widely
available
and
recyclable
plant
fiber
source,
can
provide
new
insights
for
improving
the
mechanical
properties
of
backfill
treatment
agricultural
waste
resources
research.
Different
amounts
ARSF
were
prepared
to
enhance
cemented
lithium
mica
tailings
(CLMTB),
uniaxial
compression
strength
(UCS)
tests
Brazilian
splitting
tensile
conducted
study
influence
on
static
CLMTB
samples.
Firstly,
flowability
mortars
with
different
content
was
tested,
results
showed
that
decreased
by
maximum
5.4
%,
which
met
construction
requirements
cement
mortar
in
process.
The
UCS
an
increasing
trend
then
reduced
increased
content,
0.15
%
being
optimal
showing
increase
14.2
%.
Under
loading
conditions,
gradually
0.60
content.
samples
exponential
growth
curing
age.
Additionally,
there
linear
functional
relationship
between
age
experimental
indicate
improved
toughness
changed
failure
mode
In
meantime,
it
residual
bearing
capacity
peak
strain
Construction and Building Materials,
Год журнала:
2024,
Номер
421, С. 135682 - 135682
Опубликована: Март 1, 2024
The
engineering
design
of
cemented
paste
backfill
(CPB)
typically
relies
on
technical
data
obtained
from
tests
conducted
CPB
samples
cured
under
conventional
laboratory
conditions.
However,
these
methods
often
fall
short
in
capturing
the
complex
multiaxial
stress
curing
conditions
that
masses
experience
many
underground
mines,
particularly
deep
mines.
In
mining
environments,
is
subjected
to
multi-axial
during
process
are
challenging
replicate
a
controlled
setting.
No
lab-scale
apparatus
can
currently
accurately
reproduce
actual
field
conditions,
especially
intricate
interplay
horizontal
rockwall
closure
stresses,
vertical
self-weight
stress,
and
overburden
stresses
upper
layers.
Moreover,
impact
key
properties
unknown.
To
address
this
significant
challenge
technology
gap,
study
has
developed
new
for
monitoring
realistic
compressive
loading
simulating
environment
encountered
was
then
utilized
assess
including
induced
by
closures,
(strength,
deformation
behaviour,
self-desiccation)
at
early
ages.
research
results
clearly
indicate
application
leads
enhancement
mechanical
physical
CPB.
This
supported
observable
densification
pore
structure
stresses.
addition,
comprehensive
analysis
strain
patterns
establishes
direct
correlation
between
progressive
increase
stiffness
hardness
over
time.
Furthermore,
evolution
matric
suction
degree
saturation
provides
compelling
evidence
water
consumption
or
self-desiccation.
development
fills
substantial
void
capabilities.
provide
better
understanding
behavior
multi-stress
paving
way
optimization
solutions
effectively
unique
challenges
posed
operations.
Frontiers in Earth Science,
Год журнала:
2024,
Номер
12
Опубликована: Авг. 28, 2024
Crack
propagation
is
an
important
cause
of
damage
to
rock
bodies.
In
this
study,
uniaxial
compression
tests
were
conducted
on
specimens
with
rock-like
mass
containing
fissures
different
inclination
angles
study
the
effect
crack
angle
evolution
and
fracture
characteristics
The
specimen
surface
deformation
internal
response
during
analyzed
via
digital
image
correlation
(DIC)
acoustic
emission
(AE)
techniques.
results
indicated
that
AE
fractured
exhibited
a
high
degree
activity
pore
compaction
stages.
prefabricated
fissure
configuration
affected
stress
state
at
tip,
leading
differences
in
paths
rupture
modes
angles.
Under
peak
intensity,
relative
position
normalized
global
strain
curve
point
gradually
shifted
from
tip
middle
as
increased,
which
corresponded
shear
damage-tension-shear
mixed
damage-tension
specimen.
findings
indicate
curves
can
reflect
provide
basis
for
discrimination
fissured
modes.
