Energy Science & Engineering,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 24, 2024
Abstract
In
the
Shaanxi‐Inner
Mongolia
region,
where
most
mines
employ
wide
coal
pillar
retention
and
dual
entry
layout
techniques,
mining
pressure
manifestations
frequently
occur
during
working
face
retreatment,
posing
significant
challenges
to
safe
efficient
production.
Based
on
numerical
simulation,
theoretical
analysis,
field
test
research,
this
study
proposes
a
technical
solution
for
preventing
rockburst
hazards
in
return
airway.
The
research
findings
indicate
following:
(a)
Through
simulation
retreatment
process,
airway
exhibits
characteristic
h‐pattern
of
high‐stress
distribution,
with
asymmetric
camelback
curves
appearing
within
pillar,
leading
static
load
concentration.
When
roof
breaks,
bends
excessively,
large
amount
energy
is
released,
potentially
causing
instability.
(b)
stress
peak
value
two
sides
air
lane
21,103
decreases
when
hole
length
15
m,
diameter
150
mm
distance
1
m.
(c)
Implementation
drilling
relief
effectively
alleviates
issue
adjacent
peaks
shift
deeper
into
rock
mass,
significantly
reduces
risk
occurrence.
Geomechanics and Geophysics for Geo-Energy and Geo-Resources,
Год журнала:
2024,
Номер
10(1)
Опубликована: Фев. 16, 2024
Abstract
The
Weibull
distribution
is
used
to
describe
the
heterogeneity
of
rock
hydraulics
and
embedded
into
Fish
program
which
based
on
discrete
element
method.
developed
overcomes
limitation
Universal
Distinct
Element
Code
(UDEC)
software
regarding
number
parameter
groups,
cannot
exceed
50.
A
method
for
assignment
heterogeneous
rocks
proposed
together
with
a
estimating
initial
flow
rate
value
models.
Based
established
calculation
model,
influence
block
homogeneity,
hydraulic
aperture
stress
seepage
characteristics
studied.
results
indicate
that
under
zero
conditions,
positively
correlated
N
0.5
showing
strong
linear
relationship.
relationship
gradually
enhanced
increase
in
shape
parameters.
between
parameters
logarithmic
correlation
coefficient
greater
than
0.9654.
axial
pressure
confining
can
be
described
by
quadratic
cubic
polynomials,
respectively,
we
further
discuss
variation
equivalent
apertures
various
pressures,
Sustainability,
Год журнала:
2024,
Номер
16(11), С. 4434 - 4434
Опубликована: Май 23, 2024
Green
mining
is
an
effective
way
to
achieve
sustainable
development
in
the
coal
industry.
Preventing
and
gas
outburst
dynamic
disasters
are
essential
for
ensuring
safe
mining.
The
numerous
microscopic
pores
within
serve
as
primary
storage
space
gas,
making
it
critical
explore
structural
distribution
seepage
characteristics
reveal
disaster
mechanism.
Under
stress,
micropores
of
migrates
outward
through
cracks,
with
these
cracks
exerting
a
significant
control
effect
on
migration.
Therefore,
this
study
focuses
utilizing
natural
fractured
bodies
research
objects,
employing
micro-CT
imaging
system
conduct
scanning
tests
digital
core
technology
reconstruct
sample
pore
fracture
structures
three
dimensions,
characterizing
pores,
skeleton
structure,
connectivity.
A
representative
elementary
volume
(REV)
containing
macro
was
selected
establish
equivalent
model
network,
simulation
analysis
performed
using
visualization
software.
Revealing
mass
from
perspective.
results
can
provide
guidance
drainage
early
warning
deep
mines,
thus
facilitating
enterprises.
Processes,
Год журнала:
2024,
Номер
12(4), С. 668 - 668
Опубликована: Март 27, 2024
The
distribution
law
of
the
ground
stress
field
is
great
significance
in
guiding
design
coal
mine
roadway
alignment,
determining
parameters
support,
and
preventing
controlling
impact
pressure
mines.
A
geostress
inversion
method
combining
Rhino
surface
modeling
FLAC3D
6.0
numerical
simulation
software
proposed.
Based
on
geological
data
results
on-site
measurements,
a
three-dimensional
model
Yingcheng
Coal
Mine
established
for
inversion,
obtained.
Research
shows
following:
(1)
horizontal
maximum
principal
values
are
between
33.9
35.3
MPa,
minimum
23.6
25.4
direction
roughly
southwest
to
west
direction;
(2)
three-way
magnitude
relationship
σH
>
σv
σh,
indicating
that
dominates
study
area,
which
belongs
slip-type
state;
(3)
No.
3
seam
33.1–34.8
middle
27.5–29.2
17.3–22.9
MPa.
Due
influence
topography
burial
depth,
there
phenomenon
concentration
some
areas.
By
comparing
with
measured
values,
accuracy
high,
initial
based
accurately
inverts
pattern
mine.
Energies,
Год журнала:
2023,
Номер
16(23), С. 7887 - 7887
Опубликована: Дек. 2, 2023
To
address
the
support
difficulties
caused
by
dynamic
pressure
from
adjacent
working
face
in
gob-side
entry
driving,
this
study,
taking
8103
of
Jinhuagong
Coal
Mine
Shanxi
Province
as
an
example,
adopted
methods
such
theoretical
analysis,
physical
experiments,
numerical
simulations,
and
field
practices
to
explore
roof-cutting
pressure-relieving
techniques
control
surrounding
rocks
driving
with
small
coal
pillars
under
pressure.
Fractures
lateral
roof,
stresses
on
rock,
deformations
different
cutting-roof
parameters
were
analyzed
determine
reasonable
for
applications.
The
following
results
have
been
obtained.
longer
cantilever
length
greater
load
borne
rock.
Therefore,
key
reducing
confining
a
roadway
is
roof.
After
roof
cutting,
gob
area
collapsed
more
completely.
stress
both
sides
pillar
that
ribs
solid
dropped
7.72
MPa
4.16
MPa,
respectively.
UDEC
software,
angle
height
determined
be
12°
14
m.
A
scheme
combining
“steel
strip
+
bolt
anchor
cable
cutting”
was
proposed.
With
applied,
displacement
61
mm
shorter
than
non-test
section,
duration
which
affected
mining
11
days
shorter.
rationality
selected
study
verified.
proposed
can
effectively
stability
As
shallow
coal
reserves
continue
to
deplete
rapidly,
deep
mining
has
become
an
unavoidable
course
of
action.
In
the
process
mining,
affected
by
blasting,
and
excavation,
coal-rock
interface
often
encounters
action
compression-shear
composite
load.
The
crack
directly
affects
stability
structure.
Uniaxial
compression
experiments
have
been
conducted
on
rock
coal-like
material
with
pre-existing
interfacial
oblique
cracks
study
propagation
criterion
interface.
An
image
acquisition
system
is
used
record
surface
speckle
field
whole
specimen
failure.
strain
fields
stress
intensity
factor
sample
at
different
times
are
obtained
digital
correlation.
At
same
time,
near
tip
calculated.
results
show
that
increase
loading,
two
strains
localization
bands
formed
specimen.
One
strain-localized
starts
lower
prefabricated
propagates
along
vertical
other
upper
damage
direction.
It
can
be
seen
enters
into
fracture
zone
earlier
than
tip.
band
narrows
gradually
load
increase,
then
macro
appear.
initiation
tips
suitable
for
criteria.
dominated
maximum
circumferential
tensile
stress,
shear
stress.
specimens
eventually
evolution
during
failure
reflect
generation
crack.
Water,
Год журнала:
2024,
Номер
16(5), С. 723 - 723
Опубликована: Фев. 28, 2024
The
sustainability
of
shallow
groundwater
systems,
pivotal
to
maintaining
ecosystem
equilibrium
and
facilitating
the
sustainable
development
mine
sites,
is
core
various
dynamic
indicators
in
response
mining
activity
area
planning.
This
study
quantitatively
evaluates
impact
activities
on
systems
at
orefield
scale,
taking
equivalent
permeability
coefficient
(EPC)
“Soil–Rock”
composite
water-resisting
strata
mechanism
multi-mine
as
entry
points.
A
modified
six-step
evaluation
method
for
proposed
using
mathematical
statistics,
numerical
simulation,
theoretical
analysis
methods.
used
evaluate
water
system
Yushen
area,
distribution
characteristics
resource
carrying
capacity
(WRCC)
different
areas
analyze
number
mines
allowed
be
mined
under
geological
conditions
with
a
WRCC
more
than
moderate
bearing
capacity.
results
show
that
when
set
1
×
108,
7.5
107,
5
2.5
107
m2,
designed
decreases,
surplus
gradually
increases,
values
1.70
109,
1.98
2.28
2.58
109
m2.
above
20,
31,
51,
112,
respectively.
