SSC JE Civil Engineering 25-Sep-2019 Shift 1 Solved Paper

Question : 193 of 200

Marks: +1, -0

A company has proposed to design a weir across a river in alluvial soil. The piezometric head at the bottom of the floor is computed as 10 m. The datum is 3 m below the floor bottom. The assured standing water depth above the floor is 2 m. The specific gravity of floor material is 2.5. The required minimum thickness of the floor is:

4.2 m
2 m
3.3 m
1.5 m

Validate

Solution:

(a) Surface of floor shall be enough to resist water pressures from floor bottom.
So, weight of floor per sq m = (Total water pressure)

2.5 (ρg) t = ρg(10) + ρg(3) – ρg(2)

2.5t = 11

t-11/2.5= 4.4m≈ 4.2m

Hence option (a) is correct.

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