Evolution law of overlying rock fracture field in goaf mining with double-roof-cutting retaining roadway
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Фев. 5, 2025
This
study
comprehensively
combines
physical
analog
modeling,
numerical
simulation,
on-site
monitoring,
and
other
methods
to
explore
the
overburden
rock
fissure
development
characteristics
under
double-roof-cutting
(DRC)
with
retained
roadway
conditions.
The
analysis
of
performed
tests,
simulations,
monitoring
proves
that
above
mining
conditions,
stress
transfer
between
roof
plates
open
area
on
both
sides
cut
top
is
interrupted,
load
being
in
middle
area.
former
increased
by
5%
compared
latter,
a
higher
degree
increase.
amount
subsidence
reduced
45–80%
latter.
Under
DRC,
heights
overlying
collapse
zones
are
18
m
40
m,
respectively,
versus
15
46
those
without
roof-cutting.
Fissures
most
developed,
turning
into
gas
transportation
channels.
findings
provide
theoretical
basis
for
exploring
patterns
double-cutting
tunnels.
Язык: Английский
Failure and Energy Evolution Characteristics of Saturated Natural Defective Material Under Different Confining Pressures
Materials,
Год журнала:
2025,
Номер
18(9), С. 2027 - 2027
Опубликована: Апрель 29, 2025
In
nature,
many
brittle
materials
contain
natural
defects
such
as
microcracks
or
joints,
for
example,
rocks.
Under
water-saturated
conditions,
the
strength
of
defective
undergoes
varying
degrees
attenuation,
leading
to
material
failure
and
even
structural
instability
in
engineering
contexts.
Moreover,
deformation
are
essentially
result
accumulation
dissipation
energy.
Studying
energy
evolution
under
load
is
more
conducive
reflecting
intrinsic
characteristics
changes
overall
external
loading.
Natural
rock
were
firstly
water
saturated
triaxial
compression
tests
performed
determine
mechanical
properties
materials.
The
patterns
confining
pressures
also
obtained.
Using
discrete
element
method,
macro-
micro-failure
investigated,
revealing
mesoscopic
mechanisms
these
results
indicate
that
pressure
significantly
enhances
peak
compressive
elastic
modulus
When
increased
from
0
MPa
20
MPa,
by
126.8%
91.9%,
respectively.
Confining
restricts
radial
dominates
mode.
As
increases,
mode
transitions
tensile
splitting
(at
pressure)
shear
≥
10
MPa),
with
plane
angle
gradually
decreasing
rises.
alters
storage–release
mechanism
At
load,
total
energy,
dissipated
347%,
321%,
1028%,
ratio
storage
strain
shows
a
positive
correlation,
always
higher
than
without
pressure.
exceeds
0.94,
negative
correlation
between
rate
observed.
From
perspective
fracture
materials,
crack
propagation
path
shifts
periphery
center
material,
decreases
linearly
89°
58°
increases.
dominant
direction
development
concentrated
within
45–135°
range.
findings
elucidate
which
saturation
influence
degradation
both
perspectives,
providing
theoretical
support
stability
control
related
structures.
Язык: Английский
Characteristics of surrounding rock damage and control technology of a facing-mining excavating roadway in north Shaanxi mining area
Scientific Reports,
Год журнала:
2024,
Номер
14(1)
Опубликована: Март 8, 2024
Abstract
In
a
coal
mine
in
the
northern
region
of
Shaanxi
Province,
China,
facing-mining
excavating
roadway
exists,
which
is
intended
to
be
retained
for
subsequent
working
face
safety
services.
This
paper
investigates
deformation
and
damage
characteristics
surrounding
rock
different
stages
using
FLAC
3D
numerical
simulation,
taking
this
as
research
context.
At
20
m
ahead
face,
discontinuous
plastic
zone
appears
roadway,
phenomenon
attributed
varying
hardness
lithologyand
termed
'plastic
jumping.'
The
simulation
results
have
been
were
verified
drill
hole
peeping.
Real-time
monitoring
roadway's
stability
conducted
on-site,
showing
that
significantly
affected
by
mining
at
50
point
face.
Based
on
on-site
results,
support
strength
was
increased
from
along
new
scheme
adopted.
lagging
section
where
pressure
strongly
evident,
differentiated
reinforcement
anchor
rods,
ropes,
W
steel
belts
has
employed,
resulting
satisfactory
effect.
Язык: Английский
Three-Dimensional Physical Test Study on the Overburden Breaking Behavior of Non-Penetrating Pre-Splitting in Small-Coal-Pillar Roadway Roofs
Processes,
Год журнала:
2024,
Номер
12(7), С. 1491 - 1491
Опубликована: Июль 16, 2024
In
longwall
coal
mining,
significant
deformation
of
small-pillar
roadways
presents
challenges
for
the
safe
and
efficient
retreat
mining
panels.
Non-penetrating
directional
pre-splitting
alters
roof
structure
these
effectively
manages
their
stability
under
high
stress
during
operations.
this
study,
a
three-dimensional
experimental
model
non-penetrating
small-coal-pillar
roadway
roofs
was
established,
apparent
resistivity
change
in
rock
layer
working
face
determined,
propagation
law
high-frequency
electromagnetic
waves
overlying
studied,
distribution
surrounding
investigated.
After
roof,
rate
increased
waveform
exhibited
scattering
diffraction,
forming
short
cantilever
beam.
adjacent
panel
gateway
reduced,
resulting
pressure
relief
effect
on
rock.
These
findings
were
further
validated
through
field
application,
where
overall
reduced
by
57%.
The
research
results
shed
light
management
control
rational
determination
parameters.
Язык: Английский
Fracture field evolution law of mining overburden rock under double-roof-cutting and retaining roadway conditions: a physical analog model and numerical simulation
Research Square (Research Square),
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 18, 2024
Abstract
This
study
comprehensively
combines
physical
analog
modeling,
numerical
simulation,
on-site
monitoring,
and
other
methods
to
explore
the
overburden
rock
fissure
development
characteristics
under
double-roof-cutting
(DRC)
with
retained
roadway
conditions.
The
analysis
of
performed
tests,
simulations,
monitoring
proves
that
above
mining
conditions,
stress
transfer
between
roof
plates
open
area
on
both
sides
cut
top
is
interrupted,
load
being
in
middle
area.
former
increased
by
5%
compared
latter,
a
higher
degree
increase.
amount
subsidence
reduced
45
~
80%
latter.
Under
DRC,
heights
overlying
collapse
zones
are
18m
40m,
respectively,
versus
15m
46
m
those
without
roof-cutting.
Fissures
most
developed,
turning
into
gas
transportation
channels.
findings
provide
theoretical
basis
for
exploring
patterns
double-cutting
tunnels.
Язык: Английский
Characteristics of surrounding rock damage and control technology of a facing-mining excavating roadway in north Shanxi mining area
Research Square (Research Square),
Год журнала:
2024,
Номер
unknown
Опубликована: Янв. 4, 2024
Abstract
A
coal
mine
in
the
northern
region
of
Shaanxi
Province,
China,
there
is
a
facing-mining
excavating
roadway,
to
make
roadway
be
retained
for
next
working
face
safety
services.
In
this
paper,
deformation
and
damage
characteristics
surrounding
rock
different
periods
are
investigated
by
using
FLAC
3D
numerical
simulation
with
Roadway
as
research
background.
At
20m
ahead
face,
discontinuous
plastic
zone
appeared
phenomenon
jumping
through
due
hardness
lithology.
Real-time
monitoring
stability
carried
out
on-site
measurement,
affected
large
amount
mining
50m
point
front
roadway.
Based
on
results,
support
strength
was
increased
at
over
new
program
adopted.
lagging
section
where
pressure
strongly
manifested,
anchor
rods
ropes
W
steel
belts
used
carry
differentiated
reinforcing
support,
effect
good.
Язык: Английский