International Journal for Numerical and Analytical Methods in Geomechanics,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 29, 2024
ABSTRACT
In
this
article,
we
formulate
a
computational
large‐deformation‐plasticity
(LDP)
periporomechanics
(PPM)
paradigm
through
multiplicative
decomposition
of
the
deformation
gradient
following
notion
an
intermediate
stress‐free
configuration.
PPM
is
nonlocal
meshless
formulation
poromechanics
for
deformable
porous
media
integral
equations
in
which
material
represented
by
mixed
points
with
poromechanical
interactions.
Advanced
constitutive
models
can
be
readily
integrated
within
framework.
paper,
implement
linearly
elastoplastic
model
Drucker–Prager
yield
and
post‐peak
strain
softening
(loss
cohesion).
This
accomplished
using
return
mapping
algorithm
LDP.
The
paper
presents
series
numerical
examples
that
illustrate
capabilities
to
simulate
development
shear
bands,
large
plastic
deformations,
progressive
slope
failure
mechanisms.
We
also
demonstrate
results
are
robust
stable
point
density
(grid
spacing).
complex
retrogressive
observed
sensitive
St.
Monique
clay
was
triggered
toe
erosion.
analysis
captures
distribution
horst
graben
structures
were
failed
mass.
International Journal for Numerical Methods in Engineering,
Journal Year:
2024,
Volume and Issue:
125(9)
Published: Feb. 5, 2024
Abstract
Dynamic
shearing
banding
and
fracturing
in
unsaturated
porous
media
are
significant
problems
engineering
science.
This
article
proposes
a
multiphase
micro‐periporomechanics
(PPM)
paradigm
for
modeling
dynamic
shear
media.
Periporomechanics
is
nonlocal
reformulation
of
classical
poromechanics
to
model
continuous
discontinuous
deformation/fracture
fluid
flow
through
single
framework.
In
PPM,
material
postulated
as
collection
finite
number
mixed
points.
The
length
scale
PPM
that
dictates
the
interaction
between
points
mathematical
object
lacks
direct
physical
meaning.
As
novelty,
coupled
microstructure‐based
incorporated
by
considering
micro‐rotations
solid
skeleton
following
Cosserat
continuum
theory
solids.
new
contribution,
we
reformulate
second‐order
work
detecting
instability
energy‐based
crack
criterion
J‐integral
paradigm.
stabilized
correspondence
principle
mitigates
zero‐energy
mode
augmented
include
flow.
We
have
numerically
implemented
novel
dual‐way
fractional‐step
algorithm
time
hybrid
Lagrangian–Eulerian
meshfree
method
space.
Numerical
examples
presented
demonstrate
robustness
efficacy
proposed
Journal of Rock Mechanics and Geotechnical Engineering,
Journal Year:
2024,
Volume and Issue:
16(7), P. 2732 - 2748
Published: Feb. 7, 2024
This
study
introduces
an
advanced
finite
element
model
for
the
light
weight
deflectometer
(LWD),
which
integrates
contact
mechanics
with
fully
coupled
models.
By
simulating
LWD
tests
on
granular
soils
at
various
saturation
levels,
accurately
reflects
dependence
of
modulus
dry
density,
water
content,
and
effective
stress.
addresses
overcomes
limitations
previous
models
this
specific
problem.
Simultaneously,
research
presents
first
experimentally
validated
impact
model.
Furthermore,
provides
a
comparative
assessment
elastoplastic
nonlinear
elastic
contrasts
enriched
node-to-segment
method
(developed
in
study)
more
precise
mortar
technique
mechanics.
These
comparisons
reveal
unique
advantages
challenges
each
method.
Moreover,
underscores
importance
careful
application
modulus,
emphasising
need
sophisticated
tools
to
interpret
soil
behaviour
accurately.
International Journal for Numerical and Analytical Methods in Geomechanics,
Journal Year:
2024,
Volume and Issue:
48(11), P. 2822 - 2853
Published: May 3, 2024
Abstract
Dynamic
crack
branching
in
unsaturated
porous
media
holds
significant
relevance
various
fields,
including
geotechnical
engineering,
geosciences,
and
petroleum
engineering.
This
article
presents
a
numerical
investigation
into
dynamic
using
recently
developed
coupled
micro‐periporomechanics
(PPM)
paradigm.
paradigm
extends
the
PPM
model
by
incorporating
micro‐rotation
of
solid
skeleton.
Within
this
framework,
each
material
point
is
equipped
with
three
degrees
freedom:
displacement,
micro‐rotation,
fluid
pressure.
Consistent
Cosserat
continuum
theory,
length
scale
associated
points
inherently
integrated
model.
study
encompasses
several
key
aspects:
(1)
Validation
micro‐PPM
for
effectively
modeling
deformable
media,
(2)
Examination
transition
from
single
branch
to
multiple
branches
under
drained
conditions,
(3)
Simulation
loading
(4)
Investigation
conditions.
The
results
obtained
are
systematically
analyzed
elucidate
factors
that
influence
subjected
loading.
Furthermore,
comprehensive
findings
underscore
efficacy
robustness
accurately
variably
saturated
media.
Computers and Geotechnics,
Journal Year:
2024,
Volume and Issue:
171, P. 106372 - 106372
Published: May 4, 2024
Numerical
simulations
demonstrate
the
occurrence
of
both
sub-
and
supershear
ruptures
in
dry
saturated
porous
media
during
mode
I
fracture.
Initially,
Finite
Element
Method
is
applied
to
investigate
a
case
sub-shear
velocity
beam
on
an
elastic
foundation
subjected
sinusoidal
loading.
Subsequently,
Extended
employed
for
fluid
injection
infinite
medium
plate.
The
results
reveal
transition
from
smooth
behavior
stepwise
pattern
eventually
forerunning
as
rate
increases.
Notably,
this
progression
has
been
observed
first
time.
Finally,
hybrid
Element/Peridynamic
model
utilized
explore
fully
under
mechanical
In
media,
also
considered.
Both
methods
document
velocities
surpassing
shear
wave.
noteworthy
aspect
that
these
results,
obtained
through
entirely
different
numerical
constitutive
relations,
justify
confidence
assertion
that,
fracture,
speeds
exceeding
wave
even
dilatation
can
be
achieved
forerunning.
loading
condition
investigated
may
relevant
geophysics.
