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.
Journal of Cleaner Production,
Год журнала:
2024,
Номер
440, С. 140920 - 140920
Опубликована: Янв. 25, 2024
CO2
mineral
carbonation
is
a
promising
strategy
to
sequestrate
CO2.
Whereas,
its
industrial
applications
were
still
limited
owing
high
temperature
and
pressure.
A
Trinity
green
mining
(TGM)
concept
proposed
for
sequestration,
solid
waste
treatment,
overburden
movement
mitigation.
The
samples
of
mineralized
filling
materials
(CMFM)
developed
at
ambient
pressure
feasibility
field
application
was
verified.
results
show
that:
(1)
As
the
fly
ash
(FA)
proportion
increases
from
55
%
85
%,
UCS
ascends
first
then
decreases,
reaching
peak
75
since
dosage
FA
exceeds
cementation
ability
gel.
gel
can
be
characterized
as
C–S(A)-H
silicon-based
(2)
maximum
yield
stress
88
MPa
mini-slump
109
mm.
CMFM
has
good
transportability
while
unsuitable
due
shorter
initial
setting
time.
mineralization
rate
decreases
1.34
1.13
mg
CO2/g-CMFM
with
rising
content.
parameters
fresh
slurry
transportation
pipeline
also
determined.
velocity
injection
1.5
m/s.
capacity
diameter
192
m/h
213
mm,
respectively.
working
pressures
pump
are
10.02,
8.81,
4.11,
3.91
thicknesses
8.4,
7.7,
5.2,
5.1
mm
corresponding
four
different
ratios
CMFM.
Additionally,
rises
processing
grows
54
E3
t
80
t.
In
contrast,
storage
drops
188
152
Moreover,
surface
deformation
under
TGM
illustrated
using
analogue
simulation
mechanical
modeling.
subsidence
latter
23
which
15
greater
than
that
former.
tilt
0.15
mm/m
0.13
mm/m,
curvature
0.375
E-2
0.152
E−2
mm/m2,
two
approaches
meet
grade
Ⅰ
damage
standard
buildings
released
by
state,
indicating
ameliorate
strata
migration
thus
protect
effectively.
International Journal of Mining Reclamation and Environment,
Год журнала:
2024,
Номер
38(8), С. 596 - 618
Опубликована: Март 14, 2024
The
composite
strata
structure
is
a
common
geological
formation
in
western
China.
study
of
the
failure
characteristics
great
help
to
stability
evaluation
stope
and
prediction
coal
mine
dynamic
disasters.
In
order
influence
different
hard
rock
coefficients
on
instability
samples,
triaxial
tests
with
progressive
varying
confining
pressure
simulating
field
loading
condition
were
conducted
eight
groups
samples
coefficients.
bearing
capacity
was
tested
using
RMT-150B
compression
equipment,
while
DS-5
type
eight-channel
acoustic
emission
monitoring
system
employed
for
simultaneous
parameters.
Additionally,
multifractal
theory
mathematics
applied
analysis
signals,
exploring
time
series
signals.
results
show
that
peak
strength
sample
decreases
first
then
increases
as
coefficient
increases,
which
consistent
trend
spectrum
parameter
Δfα
series.
A
significant
increase
low-frequency
high-amplitude
signal
ratio
can
be
used
precursor
early
indicate
samples.
changes
parameters
at
stages
reflect
axial
crack
propagation
two
hydrostatic
stage
rule-of-thumb
screening
testing
Simultaneously,
warn
much
more
ahead
than
conventional
approach
associated
warning
point
obtained
curves,
its
head
reaching
0.015
progress.
