The coefficient of consolidation can be graphically determined using
- ACasagrande’s logarithmic of time-fitting method
- BTaylor’s square root of the time fitting method
- CBoth (A) and (B)Correct
- DNone of these
Solution
Concept
Graphical methods for cv
Formula
cv = Tv d² / t
Step-by-step solution
1. Casagrande's logarithm of time fitting method uses a settlement vs log t curve (t50). 2. Taylor's square root of time method uses settlement vs √t (t90). 3. Both are used to find cv.
Explanation
Both the logarithm-of-time method (Casagrande) and the square-root-of-time method (Taylor) are used to get t50 or t90 from the laboratory consolidation test, and hence the coefficient of consolidation.
Shortcut
Casagrande: log t, t50. Taylor: √t, t90.
Common mistake
Choosing one method only.
Correct answer: C) Both (A) and (B)