There was a question in the Ballast materials suggesting to pick a foundation type most appropriate. The soil type condition is sandy clay with bentonite present.
In my mind, I always associated poor soils with either mat foundation or piles.
The options provided were:
a) spread footings
b) mat foundation
c) belled piers
d) grade beam on piers
The answer provided was D. Could someone explain why "grade beam on piers" would be a better solution than "mat foundation"? I always thought grade beams on piers is a good solution for underpinning foundations.
Thank you kindly,
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