International Journal of Geomechanics,
Journal Year:
2023,
Volume and Issue:
23(11)
Published: Sept. 7, 2023
Since
the
ground
reaction
curve
(GRC)
is
a
useful
tool
for
evaluating
formation
deformation
and
load
acting
on
an
underground
structure,
it
critical
to
determine
GRC,
especially
under
small
strain
conditions.
In
this
paper,
new
analytical
model
considering
progressive
development
of
loose
soil
was
proposed
describe
GRC
in
trapdoor
tests.
The
composed
undisturbed
zone,
unloading
failure
self-weight
zone.
key
parameters
were
determined
through
existing
literature.
addition,
formulas
calculating
lateral
pressure
coefficient
height
zone
derived,
respectively.
Considering
continuity
principal
stress
deflection
assuming
that
three-hinged
arch
with
reasonable
axis,
transfer
expression
deduced.
Then,
based
limit
equilibrium
theory,
vertical
obtained.
effectiveness
verified
by
comparing
calculation
results
tests,
theoretical
model,
simplified
model.
Finally,
influence
discussed
detail.
This
work
provides
meaningful
reference
estimating
GRC.
International Journal of Geomechanics,
Journal Year:
2022,
Volume and Issue:
23(2)
Published: Nov. 22, 2022
Soils
above
the
groundwater
table
and
near
ground
surface
are
often
partially
saturated,
changes
in
degree
of
saturation
matric
suction
caused
by
infiltration
may
have
substantial
effects
on
stability
geotechnical
systems.
This
work
evaluates
significant
effect
transient
flow
ultimate
bearing
capacity
strip
footings
founded
unsaturated
soils
under
simultaneous
actions
vertical
horizontal
loads
moment
using
lower-bound
theorems
finite-element
limit
analysis
incorporation
second-order
cone
programming.
The
unified
effective
stress
theory
is
incorporated
into
soil
yield
function
to
model
saturated
state,
closed-form
solution
for
one-dimensional
adopted
so
as
evaluate
tempo-spatial
variations
stress.
For
both
sand
clay
underlying
soils,
it
found
that
increase
time
leads
a
notable
decrease
size
normalized
failure
envelopes
either
obliquely
or
eccentrically
loaded
shallow
foundations.
impact
also
observed
be
greater
compared
with
deposits
due
contribution
higher
induced
SOILS AND FOUNDATIONS,
Journal Year:
2024,
Volume and Issue:
64(3), P. 101479 - 101479
Published: June 1, 2024
This
study
aims
to
explore
the
significant
impact
of
soil
fabric
anisotropy
on
ultimate
bearing
capacity
eccentrically
and
obliquely
loaded
shallow
foundations
overlying
a
geosynthetic-reinforced
granular
deposit.
For
this
purpose,
well-established
lower
bound
theorems
limit
analysis
(LA)
in
conjunction
with
finite
elements
(FE)
formulations
second-order
cone
programming
(SOCP)
are
exploited
perform
estimations.
The
consideration
mass's
inherently
anisotropic
response
layer
involves
utilization
distinct
internal
friction
angles
various
directions.
FELA
framework
adopted
incorporates
both
pull-out
tensile
mechanisms
failure
reinforcement
layer.
marked
contribution
inherent
impacts
strength
(Tu)
embedment
depth
(u)
geosynthetic
mechanism,
ratio
(BCR),
envelope
obliquely/eccentrically
strip
footing
is
rigorously
examined
discussed.
It
generally
concluded
that
for
given
depth,
envelopes
surface
V-H
V-M
planes
shrink
appreciably
increase
as
well
decrease
strength.
Moreover,
influence
overall
more
evident
case
using
strong
compared
weak
geosynthetic.
findings
investigation
demonstrate
overlooking
behaviour
numerical
would
give
rise
undesirable
non-conservative
precarious
designs.
Geosynthetics International,
Journal Year:
2023,
Volume and Issue:
31(5), P. 568 - 596
Published: June 19, 2023
In
this
study,
the
ultimate
bearing
capacity
of
shallow
strip
footings
resting
on
a
geosynthetic-reinforced
soil
mass
subjected
to
inclined
and
eccentric
combined
loading
is
rigorously
examined
through
well-established
method
lower
bound
limit
analysis
(LA)
in
conjunction
with
finite
element
(FE)
second-order
cone
programming
(SOCP).
Lower
formulation
modified
consider
tensile
force
geosynthetic
layer
so
as
account
for
both
pullout
(sliding)
rupture
(structural)
modes
reinforcement
failure.
The
effects
several
parameters,
including
embedment
depth
(u)
strength
(T
u
)
along
load
inclination
angle
(α)
eccentricity
(e),
ratio
(BCR)
failure
envelopes
overlying
foundation
are
discussed.
results
generally
show
marked
increase
surface
footing
against
inclusion
single
layer.
Results
also
reveal
that
second
intermediate
might
be
required
bear
dual
performance
vertical
concentric
scenarios
more
effectively
support
footing.
International Journal of Geomechanics,
Journal Year:
2023,
Volume and Issue:
23(6)
Published: March 21, 2023
The
paper
aims
to
evaluate
the
pseudostatic
seismic
bearing
capacity
of
shallow
foundations
on
geosynthetic-reinforced
granular
soil
subjected
inclined/eccentric
combined
loading.
This
is
achieved
through
a
comprehensive
set
lower-bound
finite-element
limit
analysis
(LB
FELA)
simulations
adopting
second-order
cone
programming.
loading
incorporated
into
element
equilibrium
equations
as
body
forces.
Both
sliding
and
structural
modes
geosynthetic
failure
are
simulated
within
FELA
framework.
influences
acceleration,
embedment
depth
(u),
ultimate
tensile
strength
(Tu)
reinforcement
layer
mechanism,
ratio,
envelope
overlying
obliquely/eccentrically
loaded
foundation
thoroughly
investigated
discussed.
It
generally
concluded
that
at
given
depth,
envelopes
shrink
substantially
with
increase
horizontal
acceleration
reduction
strength.
