Frontiers in Earth Science,
Год журнала:
2022,
Номер
10
Опубликована: Сен. 19, 2022
In
cold
regions,
the
pore
space’s
composition
and
phase
state
can
affect
elastic
modulus
of
media.
During
winter,
freezing
conditions
in
soil
results
release
water
from
space,
which
significant
changes
media’s
distribution
composition.
There
are
a
few
weaknesses
current
research
with
respect
to
change
example
frozen
soil.
This
paper
presents
that
Representative
Macroscopic
Volume
(RMV)
choice
strategy
is
provided
for
porosity
as
typical
condition
variable.
Under
freezing,
“three-box”
analytical
model
stress-strain
calculation
porous
media
established,
namely,
black-box
model,
gray-box
white-box
model.
The
relevant
equations
calculating
presented
based
on
proposed
analysis
stress
conduction
process.
Results
show
discrepancy
between
computed
experimental
values
slight,
calculated
by
established
this
consistent
actual
state.
It
be
deduced
has
practicality
conclusions
study
guiding
significance
application
Acta Geotechnica,
Год журнала:
2024,
Номер
19(9), С. 5781 - 5798
Опубликована: Фев. 28, 2024
Abstract
This
research
work
presents
a
comprehensive
experimental
study
of
frost
heave
in
fine-grained
material
to
investigate
the
effects
top
freezing
(TF)
and
bottom
(BF)
mechanisms
with
ice
lens
formation.
A
novel
test
device
was
built
artificial
ground
(AGF)-related
temperature
load
boundary
conditions.
paper
includes
62
experiments
observations
up
10
days.
The
long
duration
allows
precise
examination
growth
during
thermal
steady
state
when
line
remains
largely
stable
grows.
corresponds
holding
phase
practical
situ
AGF
implementation
where
cooling
is
used
maintain
frozen
body
thickness.
show
that
BF
heaving
larger
than
TF
most
cases.
caused
by
more
favorable
hydraulic
conditions
gravitational
vertical
cracking
occurs
formation
due
suction.
facilitates
water
accumulation
at
lens.
An
applied
reduces
differences
between
beyond
certain
value
which
an
overburden
capable
preventing
longitudinal
cracks.
International Journal for Numerical and Analytical Methods in Geomechanics,
Год журнала:
2024,
Номер
48(8), С. 2128 - 2151
Опубликована: Март 14, 2024
Abstract
Shock
waves
in
geological
materials
are
characterized
by
a
sudden
release
of
rapidly
expanding
gas,
liquid,
and
solid
particles.
These
shock
may
occur
due
to
explosive
volcanic
eruptions
or
be
artificially
triggered.
In
fact,
underground
explosions
have
often
been
used
as
an
engineering
solution
for
large‐scale
excavation,
stimulating
oil
gas
recovery,
creating
cavities
waste
storage,
even
extinguishing
field
fires.
As
such,
hydrocodes
capable
simulating
the
rapid
significant
deformation
under
extreme
conditions
can
valuable
tool
ensuring
safety
explosions.
Nevertheless,
most
formulated
Eulerian
grid,
this
setting
makes
it
non‐trivial
track
configuration
without
level
set.
The
objective
paper
is
propose
use
material
point
method
equipped
with
appropriate
equation
state
(EOS)
models
hydrocode
suitable
simulate
transverse
isotropic
geomaterials.
To
capture
anisotropic
effect
common
layered
soil
deposits,
we
introduce
new
MPM
where
version
Mie‐Gruneisen
EOS
coupled
frictional
Drucker‐Prager
plasticity
model
replicate
high‐strain‐rate
constitutive
responses
soil.
By
leveraging
Lagrangian
nature
points
historical
dependence
calculation
internal
force,
resultant
evolution
geometry
well
mechanics
materials.
International Journal for Numerical and Analytical Methods in Geomechanics,
Год журнала:
2024,
Номер
48(5), С. 1245 - 1277
Опубликована: Янв. 3, 2024
Abstract
This
study
proposes
a
novel
framework
for
ice‐rich
saturated
porous
media
using
the
phase‐field
method
(PFM)
coupled
with
thermo‐hydro‐mechanical
(THM)
formulation.
By
incorporating
PFM
and
THM
approaches
based
on
continuum
theory,
we
focus
mechanical
responses
of
fully
under
freeze‐thaw
conditions.
The
phase
transition
between
liquid
water
crystalline
ice
can
be
explicitly
expressed
as
captured
by
evaluating
internal
energy
implementing
thermal,
mechanical,
hydraulic
couplings
at
diffused
interface
PFM.
Accurately
modeling
behaviors
soil
presents
significant
challenges.
Therefore,
in
previous
numerical
frameworks,
ad
hoc
constitutive
models
were
adopted
to
phenomenologically
estimate
overall
behavior
frozen
soil.
To
address
this,
employ
that
differentiates
kinematics
solid
constituents,
enabling
our
accommodate
distinct
each
constituent.
Within
this
framework,
naturally
introduce
anisotropy
it
undergoes
freezing
process
integrating
transversely
isotropic
plastic
model
ice.
We
illustrate
capabilities
proposed
approach
through
examples,
demonstrating
its
effectiveness
revealing
anisotropic
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control,
Год журнала:
2024,
Номер
71(5), С. 607 - 620
Опубликована: Март 26, 2024
Existing
data
on
the
acoustic
properties
of
low-temperature
biological
materials
is
limited
and
widely
dispersed
across
fields.
This
makes
it
difficult
to
employ
this
information
in
development
ultrasound
applications
medical
field,
such
as
cryosurgery
rewarming
cryopreserved
tissues.
In
review,
materials,
measurement
methods
used
acquire
them
were
collected
from
a
range
scientific
The
measurements
reviewed
setup
thermal
methodologies
for
samples
preparation,
temperature
monitoring,
system
insulation.
contain
longitudinal
shear
velocity,
attenuation
coefficient
soft
tissues
biologically
relevant
substances-water,
aqueous
solutions,
lipids-in
down
-50
°C
frequency
108
kHz
25
MHz.
multiple
reflection
method
(MRM)
was
found
be
preferred
samples,
with
buffer
rod
inserted
between
transducer
sample
avoid
direct
contact.
Longitudinal
velocity
changes
are
observed
through
phase
transition
zone,
which
sharp
pure
water,
occurs
more
slowly
at
lower
temperatures
added
solutes.
Lipids
show
longer
zones
smaller
sound
changes;
during
lying
these
two
extremes.
More
general
conclusions
low-temperatures
restricted
by
data.
review
enhance
knowledge
guiding
further
biomedical
fields,
may
help
increase
precision
standardization
property
measurements.
