International Journal for Numerical and Analytical Methods in Geomechanics,
Journal Year:
2023,
Volume and Issue:
48(4), P. 1018 - 1045
Published: Dec. 27, 2023
Abstract
Solid
deformation
is
always
a
crucial
factor
of
gas
transport
in
sedimentary
rocks.
While
previous
studies
adopt
the
assumption
isotropic
poroelastic
deformation,
anisotropic
poroelastoplastic
rarely
considered,
despite
anisotropy
being
ubiquitous
property
natural
In
this
work,
an
poromechanical
model
established
to
analyze
matrix
porosity
and
apparent
permeability
evolutions
during
process
migration.
Using
thermodynamic
formulation
that
treats
fluid–solid
interface
as
independent
phase,
we
derive
rate
form
for
obtain
new
dissipation
function
contains
three
parts:
dissipations
from
solid
adsorption,
fluid
flow.
For
justify
rationality
adopted
model;
flow,
updated
can
be
substituted
into
sophisticated
models
full‐scale
analysis;
recently
developed
constitutive
appropriate
rocks
exhibiting
transverse
isotropy
both
elastic
plastic
responses
work.
Through
novel
stress‐point
simulation
incorporating
two
effective
stress
measures
adsorption
strain,
patterns
are
obtained,
which
fit
experimental
data
quite
well
cannot
reproduced
poroelasticity.
The
advantages
our
include
consistency
ability
employ
finite‐element‐based
formulation.
Finally,
initial‐boundary
value
problem
production
considering
plasticity
conducted,
effects
bedding
plane
different
highlighted.
International Journal for Numerical and Analytical Methods in Geomechanics,
Journal Year:
2021,
Volume and Issue:
46(1), P. 23 - 46
Published: Nov. 2, 2021
Abstract
Many
clay
rocks
have
distinct
bedding
planes.
Experimental
studies
shown
that
their
mechanical
properties
evolve
with
the
degree
of
saturation
(DOS),
often
higher
stiffness
and
strength
after
drying.
For
transversely
isotropic
rocks,
effects
can
differ
between
bed‐normal
(BN)
bed‐parallel
(BP)
directions,
which
gives
rise
to
saturation‐dependent
anisotropy.
Accurate
prediction
behavior
under
partially
saturated
conditions
requires
numerical
models
capture
evolving
elastic
plastic
anisotropy
DOS.
In
this
study,
we
present
an
framework
for
coupled
solid
deformation‐fluid
flow
in
unsaturated
elastoplastic
media.
We
incorporate
into
anisotropic
modified
Cam‐Clay
(MCC)
model
consider
both
responses.
The
was
calibrated
using
experimental
data
from
triaxial
tests
demonstrate
its
capability
capturing
at
various
levels
saturation.
Through
simulations,
role
rocks.
Plane
strain
simulations
compression
were
also
conducted
impacts
material
DOS
on
fluid
Computers and Geotechnics,
Journal Year:
2023,
Volume and Issue:
156, P. 105254 - 105254
Published: Feb. 2, 2023
Geological
materials
typically
demonstrate
a
nonlinear
and
path-dependent
behavior.
Recently,
data-driven
techniques
have
emerged
as
promising
alternative
to
the
traditional
constitutive
models
or
expensive
micro-scale
simulations,
which
can
expedite
simulations
of
complex
geological
systems.
In
particular,
Recurrent
Neural
Networks
(RNNs)
are
capable
capturing
history-dependent
material
However,
one
major
limitations
RNNs
is
dependence
output
stress
on
size
strain
increments.
Since
increments
vary
largely
during
within
Finite
Element
(FE)
solvers
not
known
priori,
this
limitation
hinders
application
RNN
FE
modeling,
leading
large
errors
and/or
lack
convergence.
work,
we
propose
new
model
architectures
random
walk-based
training
data
generation
method
address
shortcoming.
The
proposed
methodology
applied
J2
Drucker–Prager
plasticity
tested
in
range
boundary
value
problems
with
monotonic
cyclic
linear
sinusoidal
loading.
Numerical
results
presented
robustness
approach
Newton's
varying
for
unseen
loading
scenarios,
well
its
consistency
decreasing/increasing
rates
external
