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This question might be more appropriate for the SE Engineering site. The thing about soils is that they vary from place to place. Some are sandy, some contain more clay than others and the thicknesses of layers is also variable. All this influences how different soils react to surface loading stresses, such as from building foundations/footings. ...


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Heavy buildings can sometimes be supported by piles going down to the bedrock beneath, but a popular and cheaper solution nowadays is the use of piled-raft foundations. This consists of a slab of reinforced concrete covering the entire footprint of the building, thus spreading the load, and this slab (or raft) is supported by numerous concrete piles below it ...


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