Crack-tip propagation laws and energy evolution of fractured sandstone
Engineering Failure Analysis,
Год журнала:
2024,
Номер
unknown, С. 108832 - 108832
Опубликована: Сен. 1, 2024
Язык: Английский
Research on the prediction of tar potential and maceral recognition based on artificial neural network: A case study of tar-rich coal from north Shaanxi, China
Fuel,
Год журнала:
2024,
Номер
377, С. 132827 - 132827
Опубликована: Авг. 18, 2024
Язык: Английский
A selection methodology on reasonable width of stabilized coal pillar for retracement channel in longwall working face
Frontiers in Earth Science,
Год журнала:
2024,
Номер
12
Опубликована: Авг. 1, 2024
In
this
paper,
the
No.
30201
working
face
of
a
specific
colliery
was
determined
as
study
area
in
Yushen
mining
area,
China.
The
objective
paper
is
to
determine
optimal
position
for
pressure
regulation
measures
during
final
stage.
A
mechanical
calculation
model
stabilized
coal
pillar
developed.
analytical
solution
front
abutment
function
obtained.
Limit
equilibrium
theory
and
beam
were
employed
compute
critical
width
value
pillar.
analysis
focused
on
examining
spatiotemporal
relationship
between
rotational
deformation
main
roof
stability
retracement
channel.
utilized
numerical
simulation
investigate
failure
characteristics
surrounding
rock
stress
redistribution
within
face.
Through
comprehensive
analysis,
reasonable
15
m
successfully
implemented
field
practices.
method
using
Artificial
Neural
Network
(ANN)
select
proposed.
input
ANN
through
theoretical
analysis.
Four
models
BP,
WOA-BP,
PSO-BP,
CPSO-BP
trained.
accuracy
each
evaluated
by
three
quantitative
metrics:
MAE,
MRE,
RMSE.
MAE
0.9489,
showing
reduction
70.87%
compared
BP
model,
55.84%
WOA-BP
51.26%
PSO-BP
model.
MRE
0.0559,
which
71.51%,
56.29%,
53.24%
lower
than
other
models,
respectively.
RMSE
1.0617,
68.92%,
56.13%,
53.03%
four
values
12.7
m,
16.3
14.1
15.2
respectively,
indicating
that
can
effectively
Язык: Английский
Experimental research on creep characteristics and failure mechanism of mining roadway in nearly vertical coal seams
Frontiers in Earth Science,
Год журнала:
2024,
Номер
12
Опубликована: Июнь 19, 2024
Introduction:
Nearly
vertical
coal
seams
present
a
significant
challenge
for
the
mining
industry
due
to
their
difficult
accessibility.
However,
these
account
substantial
proportion
of
world’s
reserves.
Therefore,
it
is
vital
conduct
research
on
disaster
control
techniques
safe
seams.
Method:
The
team
used
experimental
research,
theoretical
analysis,
and
numerical
calculation
methods
investigate
creep
characteristics
failure
mechanisms
layered
sandstone
roadway
in
nearly
seam.
Results
discussion:
These
findings
revealed
that
maximum
moment
concentrated
stress
located
side
roof
was
positioned
middle
structure,
making
more
susceptible
transverse
shear
failure.
On
other
hand,
structure
floor
prone
slip
initiated
from
bottom
structure.
This
led
asymmetric
instability
roadway.
practical
implications
this
are
results
could
help
inform
development
techniques.
Язык: Английский