In soil mechanics, quick conditions are prevented by placing a graded inverted filter on the downstream side, which must satisfy:
AFilter permeability higher than subgrade soil while preventing soil particle migration
BFilter permeability lower than subgrade soil to block water flow
CEqual void ratio for filter and subgrade
DZero fine particle content
Explanation
Terzaghi’s filter criteria specify that an inverted filter must be sufficiently permeable to allow free seepage drainage while fine enough to prevent erosion of soil particles.
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