Based on the fundamental conception soil mechanics

by experimental research

the relation of the coefficient of permeability K to the void ratio e and that of the coefficient of compression aγ to the effective consolidation pressureσ’ are first expressed for normally consolidation clays. Hences the expression of relation of the consolidation coefficient cν to the void ratio e or the effective consolidation pressures is given. There are three typical cases of variation of the consolidation coefficient for different soils types

i.e. the value Cν decreases with the void ratio’s decrease; the value Cν increases with the void ratio’s decrease and the value Cν is essentially independent of the void ratio. Specific variation of the value Cν for specifically soil type is pointed out. The physical foundation for the variation of consolidation index m is explained. The relationships between the value m

the effective consolidation pressure σ’ and the soil layer thickness H are discussed. Finally

correlation between the value Cν and m’s variation as well as the noteworthy problems in practice are represented.