Atmosphere,
Journal Year:
2023,
Volume and Issue:
14(12), P. 1812 - 1812
Published: Dec. 11, 2023
The
heat
transfer
characteristics
of
porous
rock
layers
(PRLs)
have
significant
seasonal
differences.
This
feature
has
been
used
to
protect
the
permafrost
subgrade
under
highways
and
railways
from
degeneration.
However,
in
cold
sandy
environments,
transformation
law
PRLs
on
account
climate
warming
aeolian
sand
filling
needs
be
solved.
work
developed
a
coupled
model
for
soil–PRL
system
aimed
at
analyzing
convective
process
mechanism
closed
PRL.
Furthermore,
impact
cooling
performance
PRL
different
mean
annual
air
temperatures
(MAATs)
−3.5,
−4.5,
−5.5
°C
was
quantified.
numerical
results
indicated
that
natural
convection
occurred
only
winter,
effective
height
layer
decreased
with
sand-filling
thickness.
As
thickness
increased,
critical
temperature
difference
occurrence
accompanied
by
decreases
Rayleigh
number,
duration,
intensity
convection.
When
exceeded
80
cm,
would
not
occur
Under
scenario
0.052
°C·a−1,
could
offset
adverse
raise
table
first
20
years.
Moreover,
can
more
regions
colder
MAATs.
For
zones,
sand-control
measures
should
taken
maintain
long-term
study
is
great
significance
guiding
embankment
design
road
maintenance
along
Qinghai–Tibetan
Railway.
Deleted Journal,
Journal Year:
2024,
Volume and Issue:
1(2-3), P. 100014 - 100014
Published: Aug. 10, 2024
Thermal
conductivity
of
soils
is
a
critical
soil
property
in
geotechnics,
which
provides
essential
information
about
the
soil's
ability
to
conduct
heat
transfer.
Erroneous
data
can
be
responsible
for
inefficient
design
buried
infrastructure
systems
that
rely
on
transfer,
such
as
cables,
piping,
and
geothermal
systems.
There
lack
fundamental
knowledge
thermal
under
in-situ
conditions
factoring
type,
alteration
moisture
content,
salinity.
Our
research
aims
address
how
groundwater,
flooding,
or
drought
impact
due
moderate-to-high
salinity
levels;
these
may
factors
considered
testing
infrastructure.
This
study
investigated
influence
concentrations
conductivity,
with
potential
implications
areas
high
water
table,
rainfall,
flooding
events,
well
offshore
wind
projects.
accounted
variations
type
when
soil.
Twenty-three
(23)
experimental
tests
were
conducted
resulting
36
points
recorded.
The
results
further
analyzed
comparison
obtained
from
using
current
industry-accepted
methodology,
does
not
account
varying
concentrations.
suggest
sand
was
most
conductive
added
15
g/L
brine.
Further,
concentration
increase
(silty
clay)
decrease
(sandy
soil)
at
contents,
could
provide
more
informed,
economical
relies
transfer
through
soils.
Applied Sciences,
Journal Year:
2024,
Volume and Issue:
14(20), P. 9337 - 9337
Published: Oct. 14, 2024
Soil
thermal
conductivity
in
the
near-phase-transition
zone
is
a
key
parameter
affecting
stability
of
permafrost
engineering
and
its
catastrophic
processes.
Therefore,
accurately
determining
soil
this
specific
temperature
has
important
theoretical
significance.
In
present
work,
method
for
testing
fine
sandy
was
proposed
by
measuring
with
transient
plane
heat
source
volumetric
capacity
weighing
unfrozen
water
contents.
The
content
sand
specimens
tested,
corresponding
empirical
fitting
formula
established.
Finally,
based
on
results,
variation
trends
influence
laws
were
analyzed,
prediction
models
multiple
regression
(MR)
radial
basis
function
neural
network
(RBFNN)
also
results
show
following:
(1)
average
error
test
work
reference
steady-state
flow
only
7.25%,
which
validates
reliability
method.
(2)
contents
range
0~−3
°C
accounts
over
80%
entire
negative
range.
curves
exhibit
similar
trend,
can
be
divided
into
drastic
phase
transition
stable
zone.
(3)
Increases
mainly
occur
zone,
where
these
increases
account
about
60%
total
increase
region.
With
density
content,
rate
gradually
decreases.
(4)
R2,
MAE,
RSME
RBFNN
model
are
0.991,
0.011,
0.021,
respectively,
better
than
those
MR
model.
