Civil And Environmental Engineering Reports,
Год журнала:
2024,
Номер
34(4), С. 381 - 402
Опубликована: Ноя. 26, 2024
Currently,
the
most
serious
problem
associated
with
underground
mining
of
deposits
is
geomechanical
hazard,
which
significantly
disrupts
production
process
and
exposes
crew
to
a
threat
life
health.
As
recent
achievements
in
field
minimizing
hazards
show,
rock
mass
preconditioning
effective
way
prevent
risk
bursts
mining-induced
seismic
activity
mines.
In
principle,
involves
reducing
strength
parameters
by
controlled
creation
fractured
zones
introducing
an
external
force
inside
mass.
Most
often,
this
can
be
achieved
using
hydrofracturing
or
blasting.
This
paper
focused
on
description
current
State-of-The-Art
methods
are
applied
improve
efficiency
ore
extraction
Selected
ways
rockmass
evaluation
has
been
analysed
future
development
scope
active
described.
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Янв. 21, 2025
Pillar
stability
has
garnered
significant
attention
owing
to
the
effects
of
pillars
on
coal
resource
recovery
rate,
pillar
stability,
and
bump
risk.
This
study
examined
roadway
control
principles
conventional
yield
pillars.
The
were
designed
as
load-bearing
structures
with
a
high
capacity
carry
most
abutment
load,
while
buffer
for
transferring
rapidly
increasing
loads
adjacent
solid
ribs
by
progressive
deformation.
In
order
analyze
features
dynamical
evolution
vertical
stress
distribution
failure
zone
during
loading,
meticulously
validated
roof–coal–floor
composite
mathematical
model
was
established.The
energy
under
diverse
w/h
ratios
analyzed,
ratio
elastic
strain
release
rate
introduced
evaluate
severity.
Furthermore,
behavior
damage
mechanism
differences
between
investigated:
are
strong
that
bear
load
transfer
sudden
nearby
gradually
deforming.
Finally,
two
case
studies
in
Zhulinshan
mine
Tashan
reported.
Designs,
Год журнала:
2024,
Номер
8(6), С. 116 - 116
Опубликована: Ноя. 6, 2024
The
water
diversion
surge
shaft
is
vital
for
a
hydropower
station.
However,
the
complex
geological
properties
of
surrounding
rock
make
it
challenging
to
obtain
its
mechanical
parameters.
A
method
combining
particle
swarm
optimization
(PSO)
and
support
vector
machine
(SVM)
algorithms
proposed
estimating
these
According
engineering
background
scheme,
three-dimensional
model
established
by
FLAC3D.
An
orthogonal
test
designed
verify
accuracy
numerical
model.
Then,
parameter
database
established.
PSO-SVM
intelligent
inversion
algorithm
used
invert
optimal
values
parameters
rock.
excavating
next
layer
depends
on
current
layer.
optimized
design
scheme
then
compared
analyzed
with
original
considering
deformation
plastic
characteristics.
research
results
demonstrate
that
can
effectively
improve
efficiency
Under
influence
excavation,
in
zone
mainly
fails
shear,
maximum
occurring
middle
lower
parts
excavation
area.
under
long
anchor
cables
0.6
cm
less
than
without
4.07
an
anchor.
In
direction
minimum
principal
stress,
depth
1.3
m
2.6
Compared
anchor,
control
limit
development
zone.
Frontiers in Earth Science,
Год журнала:
2025,
Номер
13
Опубликована: Фев. 25, 2025
The
freezing
method
is
often
adopted
to
reinforce
the
surrounding
formation
during
deep
foundation
pit
excavations.
According
traditional
theory
of
wall
design
in
coal
mine
construction
engineering,
it
necessary
a
continuous,
thicker
wall.
multi-turn
combination
cylinder
structure
can
optimize
design,
but
strength
and
stability
are
theoretical
technical
issues
that
urgently
need
be
researched
solved.
In
this
work,
mechanical
characteristics
frozen
walls
multi-coil
composite
cylinders
analyzed
using
methods.
Based
on
elastoplastic
theory,
combined
simplified
an
axisymmetric
plane
problem,
calculation
model
expansion
force,
generated
by
process,
around
perimeter
circular
hole
under
strain
developed.
corresponding
variable
for
displacement
immobility
point
circle
proposed,
progressive
achieved
through
iterative
calculations.
formulas
force
process
derived
considering
gradual
expansion.
results
research
provide
basis
permafrost
engineering.
Frontiers in Earth Science,
Год журнала:
2025,
Номер
13
Опубликована: Март 19, 2025
In
the
final
mining
phase
of
working
face,
a
large
area
suspended
roof
can
lead
to
stress
concentration
from
mining-induced
stress,
which
in
turn
causes
deformation
and
instability
main
roadway.
This
study
takes
Ji-17-21080
face
Pingdingshan
No.
2
Mine
as
engineering
background,
analyzing
structural
characteristics
layer
distribution
advanced
support
while
revealing
principle
cutting
pressure
relief
for
protecting
Further,
FLAC
3D
numerical
model
was
established
based
on
on-site
geological
conditions.
The
surrounding
rock
roadway
were
compared
under
four
scenarios:
(1)
stop-mining
coal
pillar
width
120
m
(no
line),
(2)
60
(3)
with
one
line,
(4)
two
lines.
simulation
results
indicate
that
reducing
significantly
increases
effects
roof.
However,
implementation
measures
effectively
interrupts
transmission
path
support,
improving
environment.
Furthermore,
single
synergistic
effect
lines
is
more
beneficial.
Finally,
designed
deep-hole
blasting
at
face.
Field
monitoring
showed
air
return
downhill
remained
within
controllable
limits,
ensuring
safe
operation
next
area.
