CD-A twin niches in the Mont Terri Rock Laboratory: Characterization and interpretation of hydraulic parameters with regard to safety aspects
International Journal of Rock Mechanics and Mining Sciences,
Год журнала:
2024,
Номер
174, С. 105624 - 105624
Опубликована: Янв. 13, 2024
In
the
Mont
Terri
Rock
Laboratory
(Switzerland),
a
comprehensive
interdisciplinary
exploration
program
is
carried
out
to
increase
knowledge
about
long-term
coupled
hydraulic–mechanical
effects
in
Opalinus
Clay.
As
these
are
of
significant
interest
regarding
stability
and
integrity
potential
storage
facility
for
high
radioactive
waste,
"Influence
humidity
on
cyclic
longterm
deformations"
(CD-A)
experiment
aims
characterize
Clay,
especially
its
heterogeneous
sandy
facies,
investigate
evolution
water
content,
pressure
deformation
formation.
This
article
provides
an
overview
measurement
examinations
geologic
investigations
context
CD-A
experiment.
The
twin
niches
located
upper
facies
Clay
which
characterized
by
existence
different
subfacies
types
fault
zones.
contribution
focuses
detailed
characterization
claystone,
while
content.
Combined
geophysical
geological
during
first
two
years
after
excavation
have
been
out.
They
indicate
that
type
pre-existing
zones
do
not
affect
distribution
content
severely,
could
be
essential
finding
detection
procedures
level
waste
(HLW)
repositories.
Furthermore,
miniseismic
as
well
pulse
tests
clearly,
extent
damaged
zone
(EDZ)
strongly
depends
climatic
conditions
underground
galleries:
After
1.5
EDZ
permeability
much
more
pronounced
open
than
closed
twin.
Future
work
increased
process
understanding
based
verified
constitutive
model
system
considering
due
impact
geotechnical
boundary
heteregeneities.
Язык: Английский
Modeling Desiccation Cracks in Opalinus Clay at Field Scale with the Phase-Field Approach
InterPore journal.,
Год журнала:
2024,
Номер
1(1), С. ipj260424 - 7
Опубликована: Май 3, 2024
Geological
materials
such
as
Opalinus
Clay
show
complex
coupled
hydro-mechanical
behavior
at
laboratory
and
field
scales.
In
the
context
of
radioactive
waste
disposal,
in-situ
excavations
might
remain
open
for
ventilation
operation
decades
and,
consequently,
be
susceptible
to
environmental
changes
desaturation.
The
saturation
can
then
lead
mechanical
deformation
desiccation
cracks.
To
account
cracking
scale,
this
study
proposes
an
unsaturated
model
combined
with
phase-field
approach.
Using
experimental
data
input
in
numerical
model,
modeling
framework
is
applied
simulating
effects
cracks
reported
Cyclic
Deformation
(CD-A)
experiment
carried
out
formation
Mont
Terri
Rock
Laboratory
Switzerland.
Simulations
homogeneous
heterogeneous
material
properties
generated
from
experimentally
obtained
ranges
are
out.
Crack
initiation
propagation
a
good
correlation
monitored
relative
humidity
range
experiment.
Practical
information
summarized
motivate
application
proposed
formulation
different
setups.
Finally,
possibilities
improve
reason
simplification
more
abstract
models
indicated.
Язык: Английский