If the corrected blow counts between base of footing and depth equal to 2 times width of footing are 13, 17, 20, 25 and 45, then the individual corrected blow count that should be neglected for estimation of bearing capacity of shallow foundation as per IS 6403 is
- A13
- B25
- C45Correct
- DNone of these
Solution
Concept
Rejecting outlier SPT values
Step-by-step solution
1. Values: 13, 17, 20, 25, 45; mean ≈ 24; 45 is well above and is neglected as an outlier.
Explanation
IS 6403 suggests ignoring abnormal values.
Why the other options are wrong
13 and 25 are close to the mean.
Shortcut
Outlier = 45.
Correct answer: C) 45