Answer / v.rajesh

p = (P/A +/- M/Z)
p= P1 for positive sign
p = P 2 for negative sign

With this induced stresses on soil ( which should be less
than the safe permissible bearing capacity of soil
available at site , Moment should be calculated and then
depth should be calculated.This is for the combination of
axial load and moment acting on the structure.

Answer / bipin padhy

The base pressure can be calculated and it must be less
than the bearing capacity of soil. Based on the bearing
capacity of soil, the depth of foundation is decided in
case of general structures except for river bridges. But
one has to be careful about the strata below the founding
level. For river bridges, the founding depth decision is
tricky and normally two metres below the calculated scour
depth provided the strata has the bearing capacity more
than the base pressure.Raft foundation or box cell is not
preferred where the velocity of flow is more than
1.5m/sec. In case of shallow foundation including raft, the
length of rigid apron and cut off wall requires to be
determined carefully.

Answer / azhar

Depth of foundation=

width of wall +30 c.m.

Answer / mks

thumb rule
depth of foundation = width of foundation

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