The
shotcrete
structure
commonly
serves
as
a
support
system
in
variable
high-temperature
(VHT)
environment
of
the
high
geothermal
tunnels.
However,
influence
VHT
on
stress
state
fiber
shotcrete-rock
composite
is
still
not
well
understood.
To
address
this
issue,
triaxial
compression
tests
were
conducted
alkali-resistant
glass
samples
(ARGFS-RCSs)
with
curing,
while
acoustic
emission
(AE)
features
monitored.
microscopic
properties
(ARGFS)
under
conditions
investigated
by
nuclear
magnetic
resonance
(NMR)
and
scanning
electron
microscope
(SEM).
results
study
revealed
that:
(1)
Curing
temperature,
confining
pressure,
joint
roughness
coefficient
(JRC)
significantly
affected
compressive
strength
damage
mode
ARGFS-RCS.
(2)
caused
temperature
to
ARGFS-RCS
will
increase
JRC.
(3)
According
AE
characteristics,
initial
curing
increases,
events
become
more
active.
(4)
incorporation
ARGF
admixture
facilitated
combined
action
groups
hydration
products
concrete,
enabling
enhance
coordinated
deformability.
relevant
research
can
provide
reference
for
research,
design,
construction
underground
engineering.
Geomechanics and Geophysics for Geo-Energy and Geo-Resources,
Journal Year:
2024,
Volume and Issue:
10(1)
Published: May 14, 2024
Abstract
This
study
investigates
the
stability
of
an
artificial
dam
used
in
underground
reservoir
a
coal
mine
under
periodic
weighting
imposed
by
overlying
rock
strata.
For
this
purpose,
cyclic
loading
and
unloading
tests
with
different
stress
amplitudes
were
designed.
Differences
mechanical
performance
without
strata
analyzed
using
uniaxial
compression
test.
The
properties
structure
constant-amplitude
characterized.
Further,
law
influence
amplitude
on
was
discussed.
A
formula
for
predicting
its
rocks
(hereafter
referred
to
as
complex)
finally
derived
suitable
clarifying
damage
complex
unloading.
results
showed
that
had
changed
internal
rocks.
strength
deformation
intermediate
either
single
structure.
All
three
underwent
brittle
failure.
During
tests,
hysteresis
loop
could
be
divided
into
phases,
namely,
sparse,
dense,
sparse
again,
shift
turning
point
memory
effect.
As
increased
during
test,
damping
ratio
specimens
decreased,
area
non-linearly.
dynamic
elastic
modulus
decreased
first
then
increased.
confidence
interval
fitted
based
test
above
97%.
Damage
caused
stages.
An
increase
peak
served
catalyst
evolution
small
cracks
within
median
large
cracks,
thereby
accelerating
process.
Deep Underground Science and Engineering,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 4, 2025
Abstract
Excavation
unloading
damages
rock
masses,
with
preferential
failure
along
geological
defects
in
engineering,
which
may
induce
catastrophe
hazards.
It
is
important
to
study
the
of
jointed
under
true‐triaxial
conditions.
3D
DEM
modeling
tests
on
through‐going
joint
considering
contributing
factors,
that
is,
inclination,
initial
confining
pressure,
and
point,
were
conducted
mechanical
properties,
cracking
behaviors,
characteristics.
Six
typical
modes
summarized
based
development
main
cracks,
associated
mechanisms
studied
by
analysis
ratio
tensile
crack
shear
crack.
An
energy
criterion
determining
whether
unloading‐induced
occurs
instantaneously
was
proposed
comparing
accumulated
elastic
strain
at
point
simulations
limit
stored
rocks
biaxial
compression
tests.
Furthermore,
strength
characteristics
applicability
Mogi–Coulomb
describing
specimens
conditions
studied.
This
provides
some
new
insights
into
rock,
be
valuable
for
revealing
mechanism
instabilities
influenced
deep
excavations.
