Geoscience Reference
In-Depth Information
application 10.4
Water is seeping out of a slope which consists of horizontal thin clay and sand
layers (sandwich structure). Observation shows that the actual slope angle 15.5
o
is
just stable. Find an expression for the apparent volumetric soil weight
(in kN/m
3
)
of the soil as function of the average internal friction angle
, assuming isotropic
permeability. Make a sketch of the graph. With an easily obtainable estimate of the
soil weight a reasonable value for
can be found
.
For example, what is
if the
wet unit soil weight is 16 kN/m
3
?
application 10.5
A certain slope at an angle of 25
o
is stable under dry conditions. The soil
volumetric weight is 19 kN/m
3
. What is the reduction in the stability factor when
after heavy rain the water stored in the dike and is flowing horizontally out of the
slope? Assume an anisotropy factor of
= 1.
application 10.6
A long slope of a saturated soil layer of 5 m thick is just stable at 45
o
. The wet
unit weight is 19 kN/m
3
and the friction angle
= 41
o
. What is the cohesion? Does
the stability factor
F
change when the soil becomes submerged?
application 10.7
Is Taylor's diagram for circular slip stability an upper or a lower limit approach?
Indicate how you argue your answer. What additional safety factor do you
recommend?
application 10.8
In Fig 10.2, the pore pressure field
u
increases linearly with
. However, the
flow field is directed not along the
axis but at an angle
to the horizontal.
Explain the apparent discrepancy.
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