Table 8-7.1 Stabilization of Soils for the Foundations of Structures
Method
Principle
Most
Maximum
Economical
Special
Special
Properties of
Special
Relative
Suitable
Effective
Size of
Materials
Equipment
Treated
Advantages
Costs
Soil
Treatment
Treated
Required
Required
Material
and
(1976)
Condition/
Depth
Area
Limitations
Type
(feet)
>1000m2
Normally
Low /
Reduced water
------
Easy, theory
Preloading
Load is
Earth fill
Earth
consolidated
moderate
content and
well
applied
or other
moving
soft clays,
if vertical
void ratio/
developed,
sufficiently in
material
equipment;
drains are
silts, organic
increased
consistent
advance of
for loading
large H2O
deposits,
required.
strength
and uniform;
tanks or
construction
the site;
completed
requires long
so that
sand or
vacuum
sanitary
time (sand
compression
gravel for
landfills
drains or
of soft soils
systems
wicks can be
may be
is completed
blanket.
used to
prior to site
used;
reduce
development
settlement
markers;
time
piezometers
>1000m2
Surcharge
Fill in excess
Earth fill /
Reduced H2O
Faster than
Earth
Normally
Moderate/
------
fills
of that
other
content, void
preloading
moving
consolidated
Sand
required
material
ratios and
w/o
equipment;
soft clays,
drains
permanently
for
compressibility:
surcharge;
settlement
silts, organic
moderate
is applied to
loading/
increased
theory well
markers;
deposits:
cost
achieve a
sand or
strength
developed;
piezometers
completed
given amt of
gravel as
extra
sanitary
settlement in
material
landfills
a shorter
blanket
handing; use
time; excess
sand drains/
fill then
wicks
removed
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