Question

Identify the two TRUE statements from the following four statements.
I. Negative skin friction is higher on floating piles than on end bearing piles.
II. All other things being the same in footings on sand, the footing with smaller width will have lower settlement at the same net pressure.
Ill. The void ratio of soils is always less than 1.0.
IV. For determining the depth of embedment of anchored sheet piles, net moment at the anchor elevation is set to zero.

• A. I & IV
• B. I & III
• C. I & IV
• D. II & III

Answer 1

The correct option is C I & IV

Void ratio of soil can be greater than one
for footings on sand
$S_f={\left(\frac{B_f(B_p+30)}{B_p(B_f+30)}\right)}^2.S_p$
$\text{as}{B}_f\text{increase}\frac{B_f}{B_f+30}\text{will also increase}$
$\therefore$ footing with larger width undergo settlement and vice-versa.
The depth of embedment of anchored sheet pile is determined by equating net moment to zero at anchor point.
Hence option (c) is correct.