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Micro Piles |
Pressure Grouting |
Rock Anchors |
Permeation Grouting
Soil Nailing |
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Our
techniques apply when adding new structures:
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foundation support.
We
specialize in
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architecture of buildings, bridges,
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agriculture, and
roads
construction. We
are experienced in these applications:
micro piles,
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permeation grouting, pressure
grout,
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chemical grouting,
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rock anchors.
Our specialties are
rock anchor,
acrylamide and
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Footing Foundations
JULY
1997
4-5
Bearing Capacity
The ultimate bearing capacity of a soil mass supporting a footing foundation is the maxi-
mum pressure that can be applied without causing shear failure or excessive settlement.
At present, ultimate bearing capacity solutions are based primarily on the Theory of
Plasticity; that is, the soil mass is incompressible (does not deform) prior to shear failure.
After failure, deformation (plastic flow) occurs with no increase in shear.
The implication of the foregoing statements is that theoretical predictions can only be
applied to soils that are homogeneous and incompressible. However, most soils are neither
homogeneous nor incompressible. Consequently, known theoretical solutions are used in
bearing capacity analyses but are modified to provide for variations in soil characteristics.
These modifications are based primarily on data obtained empirically and through small-
scale testing.
Failure Modes
Shear failure of a soil mass supporting a footing foundation will occur in one of three
modes: (1) general shear, (2) punching shear, or (3) local shear. The general shear failure
mode can be theoretically described by the Theory of Plasticity. The other two failure modes,
punching and local shear, have, as yet, no theoretical solutions.
General shear failure is shown in Figure 4-4 and can be described as follows: The soil wedge
immediately beneath the footing (an active Rankine zone acting as part of the footing)
pushes Zone II laterally. This horizontal displacement of Zone II causes Zone III (a passive
Rankine zone) to move upward.