The
evolution
mechanism
of
frozen
soil
involves
a
complex
dynamic
coupling
process
among
temperature,
moisture,
and
the
stress
field.
However,
existing
research
has
struggled
to
adequately
describe
interplay
between
these
factors.
To
address
this,
we
have
independently
designed
developed
multifunctional
loading
system
for
geotechnical
engineering
its
corresponding
technology.
Using
vertical
shaft
freezing
model,
studied
spatiotemporal
thermo-hydro-mechanical
(THM)
multi-field
coupling.
Drawing
on
experimental
data
concerning
volumetric
heat
capacity
thermal
conductivity
samples
at
varying
temperatures,
refined
governing
equations
This
paved
way
establishment
an
evaluative
framework
projects.
Incorporating
2-tuple
linguistic
Bayesian
networks,
redefined
weighting
approach
comprehensive
evaluation
model
in
social
sciences,
introducing
methodology
translate
into
adjusted
weights
criterion
level.
Research
findings
indicate
that,
compared
interface,
main
section
experiences
not
only
more
intense
variations
temperature
field
but
also
heightened
activity
in-situ
or
moisture
migration.
Both
radial
circumferential
characteristic
faces
exhibit
wave-like
gradient
evolution.
face
displays
critical
approximating
3.8m-1,
whereas
face's
curve
undergoes
temporal
elongation
peak,
resulting
no
discernible
extremities.
Each
position's
frost
heave
force
growth
three
distinct
phases:
incubation,
rapid
increase,
stabilization.
During
same
phase,
response
time
is
roughly
equivalent.
moving
outward
along
equivalent
radius,
exhibits
progressively
delayed
trend.
After
2880
mins
freezing,
expansion
area
wall
amounts
0.25m²,
with
average
-11.58℃
mean
water
content
14.6%.
In
practical
applications,
it
generally
recommended
continue
using
plan
typical
areas
geological
conditions,
might
be
prudent
consider
increasing
arrangement
density
pipes.
For
scenarios
where
there
stringent
requirement
control
heave,
adopting
staggered
pipe
layout
advisable.
Permafrost and Periglacial Processes,
Год журнала:
2024,
Номер
35(2), С. 109 - 124
Опубликована: Янв. 30, 2024
Abstract
Sandy
saline
soils
are
widely
distributed
and
commonly
experience
seasonal
or
long‐term
freezing,
yet
the
freezing
process
in
these
is
rarely
studied.
This
research
utilized
situ
X‐ray
computed
tomography
(CT)
to
visualize
pore‐scale
processes
sandy
under
various
initial
water
salt
contents.
Micron‐resolution
observations
of
pore
ice
unfrozen
produced
new
insights
into
preferential
orientation
grouping
crystals,
intersections
between
different
crystal
groups
causing
anisotropic
behavior,
decreasing
size
faster
rates,
formation
interconnected
networks
both
upon
freezing.
From
a
thermodynamic
perspective,
content
liquid
dependent
on
local
temperature
as
described
by
water–salt
phase
diagram.
Furthermore,
volume
ratio
reflects
mass
transfer
occurring
due
diffusion
fluid
flow
processes.
work
improves
understanding
complex
phenomena
through
high‐resolution
evidence
crystallization
patterns,
transformation
mechanisms,
coupled
heat‐mass
transfer.
Case Studies in Thermal Engineering,
Год журнала:
2024,
Номер
57, С. 104366 - 104366
Опубликована: Апрель 8, 2024
Soil
properties
play
a
crucial
role
in
the
stability
of
engineering
foundations,
particularly
cold
regions
where
temperature
gradients
impact
water
migration
and
soil
conditions.
This
study
utilized
MRI-Cryogenic
Soil-Moisture
Analyzer
(MRI-CSMA)
to
conduct
indoor
freeze-thaw
experiments
on
silty
clay
specimens
with
varying
initial
contents
(12.0
%,
16.8
21.1
%).
Dynamic
changes
content
at
different
depths
were
analyzed.
The
results
revealed
distinct
stage
decrease
characteristics
both
as
freezing
progressed,
more
pronounced
closer
end.
Conversely,
during
thawing,
temperatures
gradually
increased
boundary
rose.
Notably,
after
cycle,
frozen
zone
consistently
retained
higher
than
unfrozen
zone,
indicating
redistribution,
regardless
levels.
Furthermore,
three
samples
contents,
flux
layer
decreased
exponentially
time
increased.
phenomenon
can
be
attributed
combined
effects
conditions,
gradients,
structure
freezing.
These
findings
are
likely
have
significant
implications
for
understanding
water-heat
dynamics
region
soils
well
ensuring
projects.
River,
Год журнала:
2024,
Номер
3(2), С. 166 - 180
Опубликована: Апрель 28, 2024
Abstract
In
seasonal
frozen
soil,
freezing
and
thawing
can
change
the
physical
mechanical
properties
affect
slope
stability.
There
are
complex
moisture
conditions
in
main
water
transfer
canal.
A
study
of
hydrothermal
evolution
canals
with
different
initial
contents
under
action
is
great
importance
for
prevention
control
canal
slides.
Hydrothermal
coupling
models
key
to
revealing
canal's
evolution.
As
some
modeling
parameters
current
model
based
on
empirical
values,
particularly
those
van
Genuchten
equation,
which
not
necessarily
related
soil
properties,
they
suitable
analyzing
canals.
This
paper
determines
soil‐water
characteristic
curve
from
cumulative
particle
gradation
subsoil,
then
hydraulic
subsoil
using
VG
model,
corrects
model.
The
method
modifying
original,
makes
more
realistically
reflect
drainage
characteristics.
During
channel
slopes
(21%,
25%,
29%,
33%,
37%,
41%),
temperature
field,
ice
content
distributions
were
investigated.
Using
V‐G
optimal
a
=
0.06,
n
1.2,
m
0.17,
distribution
trends
between
basically
similar.
Water
will
accumulate
at
bottom
as
liquid
increases
boundary.
