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Answer Posted / 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.
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