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Terms in this set (45)
, • Support imposed loads
• Prevent settlement (including
differential settlement)
• Prevent possible movement of
structure due to periodic shrinkage
and swelling of subsoil
• Allow building over water or water-
What are the
logged ground
functions of
• Resist uplift or overturning forces
foundation for a
due to wind
building
• Resist lateral forces due to soil
structure?
movement
• Underpin (support) existing or
unstable structures
• Transmit the load further into the
ground to counteract the moment
which will occur due to any
horizontal loads
, • High level / Shallow Types of
Foundation
• Low level / Piled Strip footing, Pad
(or Spread) footing, Raft (or Mat)
footing, Strapped (or Combined)
footing
Shallow:
How many types • Shallow foundations take their
of foundation name from the level they are
and what are founded
their • Typically lighter load than deep
performances? (piled) foundation
• Much cheaper to construct
• No specialist equipment needed
Deep:
Transferring foundations to a
convenient level; a firm soil stratum
with sufficient load carrying
capacity
, • Pad foundation - Used for
relatively light loads or excellent
ground conditions such as high level
rock (Not suitable for varying
What are the ground conditions)
shallow • Strip footing - Used under walls or
foundation where there is a line of closely
types? spaced columns
• Raft (or Mat) footing - Used where
ground conditions are reasonably
good but variation is apparent
across the site
Sketch the -
pressure
distribution for
the pad
foundation
below subject to
uniformly
distributed load