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one problem caused by soil in building relates to back filling around foundation walls and in service trenches. once soil has been removed from its original location, it tends to increase in bulk, because pressure is no longer keeping the particles closely packed. when soil is returned to the excavation site it is still bulked state, and unless some special measures are takes during back-filling time and weather eill bring about a return to the original volume, causing shrinkage in the hole, this can be overcome by compacting the soil while is being replaced. by Silvio Chirindja

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