Correct Answer - Option 4 : All the above
Explanation:
Degree of consolidation:
The degree of consolidation is defined as the ratio of settlement at a particular time to the ultimate settlement, expressed in percentage. Also, the degree of consolidation is the function of the time factor (Tv).
Tv = \(\frac{{{C_v}t}}{{{d^2}}}\)
where Cv = Coefficient of consolidation, t = time in sec, d = length /thickness of drainage path
So, the Degree of consolidation depends on the thickness of the drainage path and coefficient of consolidation.
Now,
Cv = \(\frac{k}{{{m_v} \times \;{γ _w}}}\)
where k = coefficient of permeability, mv = coefficient of volume change, γw = unit wt. of water.
Hence the degree of consolidation depends on the permeability of the layer also.
Coefficient of compressibility (av) = \(\frac{{{e_1} - {e_2}}}{{{σ _2} - {σ _1}}}\)
where e1 = void ratio at effective stress σ1, e2 = void ratio at effective stress σ2
Coefficient of compression or Compression Index (Cc) = \(\frac{{{e_1} - {e_2}}}{{\log \frac{{{σ _2}}}{{{σ _1}}}}}\)
where e1 = void ratio at effective stress σ1, e2 = void ratio at effective stress σ2