Building
structures fail because there is a failure already in the foundation. It is
always advisable to get it right at the first time than seeking for a remedy
when the unexpected happens.
Getting it
right the first time is by far cheaper and less stressful than seeking for a
remedy when the unexpected happens. Nothing can be used to compare a quality
foundation that can comfortably carry a superstructure despite the cost.
In some
instances, the cost of a foundation can triple that of the superstructure
itself especially in reclaimed lands, lands where mining has taken place,
clayey soils, lands previously used for refuse dump, etc.
Fig 1: A failed fence caused by soil
heaving.
Foundations
fail because of the differential settlement of the soil upon which it was
built. This in turn leads to the failure of the superstructure.
The following can lead to increase in
settlement
1.
Very
loose soils
2.
Highly
shrinkable soils
3.
Reclaimed
lands
4.
Areas
where mining is taking place
5.
Abandoned
mines.
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