Adverse Subsurface Conditions - Fundation Performance.

If poor soil conditions are encountered,  procedures that may be used to ensure satisfactory foundation performance include the following:

a. Bypass the poor soil by means of deep foundations extending to or into a suitable bearing material.

b. Design the structure foundations to accommodate expected differential settlements.

Distinguish between settlements during construction that affect a structure and those that occur during construction before a structure is affected by differential settlements.

c. Remove the poor material,  and either treat and replace it or substitute good compacted fill material.

d. Treat the soil in place prior to construction to improve its properties.  This procedure generally requires considerable time.  The latter two procedures are carried out using various techniques of soil stabilization described later.

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