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Micro Piles |
Pressure Grouting |
Rock Anchors |
Permeation Grouting
Soil Nailing |
Compaction Grouting |
Micropiles |
Injection Grouting |
Chemical Grouting
Our
techniques apply when adding new structures:
especially
rock anchor,
microfine cement,
soil nailing,
micropile
installations for
foundation support.
We
specialize in
slope stabilization,
anchors,
permeation grouting,
foundation repair
and support,
grouting,
soil nails,
rock drilling,
micropile installations, and
sinkholes. We
use a
problem-solving approach geotechnical
architecture of buildings, bridges,
water plants, sewage plants, tunnels,
sinkholes,
caisson,
shoring,
underpinning,
agriculture, and
roads
construction. We
are experienced in these applications:
micro piles,
sinkhole repair,
permeation grouting, pressure
grout,
soil nails,
chemical grouting,
micropiles,
compaction grout, and
rock anchors.
Our specialties are
rock anchor,
acrylamide and
compaction grouting,
mini piles,
sinkhole repair,
micropiles,
acrylamide grouting, and
soil nailing.
We will continue to dedicate ourselves to
excellence,
including
insurance mortgage, in our performance, in our
integrity, and in our relationships with our
customers. We will carefully weigh our
decisions, actions, and results to make sure
that we remain the most trusted name in the
geotechnical contracting industry. Please
visit our website
http://www.rembco.com/.
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Footing Foundations
JULY
1997
CALTRANS FOUNDATION MANUAL
4-7
Figure 4-6: Local Shear Failure
Figure 4-7: Failure Modes
The failure mode to be expected for a given soil profile cannot be predicted. The statement
can be made, however, that the mode of failure depends substantially on the compressibility
or incompressibility of the soil mass. This is not to imply that soil type alone determines
failure mode. For example, a shallow footing supported on a very dense sand will usually
fail in general shear, but the same footing supported on a very dense sand which is under-
lain by a soft clay layer may fail in punching shear.
The ultimate bearing capacity of a given soil mass under spread footings for permanent
construction is usually determined by one of the variations of the general bearing capacity
equation which was derived by Terzaghi and later modified by Mererhof. It can be used to
compute the ultimate bearing capacity as follows:
q
N cN D N Terzaghi
ult
c f q
=
++
.
.
.
.
2
(
)
Punching shear failure pattern under a rectangular foun-
dation on the surface of loose sand (D
r
= 15%). (From
De Beer and Vesic, 1958.)
Local shear failure pattern under a rectangular footing on
medium dense sand (D
r
= 47%). (From De Beer and Vesic,
1958.)
General shear failure pattern under a rectangular footing
on dense sand (D
r
= 100%). (From De Beer and Vesic,
1958.)