MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Hydrology & Irrigation

Basic Concepts of Bligh’s Theory

At a certain ...

Question

At a certain point in the floor of the weir, the uplift pressure head due to seepage is 4.8 m. If the relative density of concrete is 3.4, then the minimum thickness of floor required at this point to counteract the uplift pressure is ____ m.
2

Open in App

Solution

The correct option is A 2
Thickness of floor,

$t = \frac{h}{G - 1} = \frac{4.8}{3.4 - 1} = 2 m$

Suggest Corrections

thumbs-up

1

Similar questions

Q. Uplift pressures at points A and B shown in figure are 1.575 and 2.420 m respectively. If the sheet pile is at the downstream end of the floor, the uplift pressure at C is ________ m.

Q. Uplift pressures at points E and D (Fig. A) of a straight horizontal floor of negligible thickness with a sheet pile at the downstream end are 28% and 20% respectively. If the sheet pile is at the upstream end of the floor (Fig B), the uplift pressures at points

D_{1} a n d C_{1}

Q. Consider the following hydraulic structure being constructed on sand:

The uplift pressure at point A is __________ kN/m

^{2}

.
[Use Bligh's creep theory and take

γ_{w} = 10 k N / m^{3}

]

Q. The absolute pressure at a point 2.5 m below the clear water surface is measured as 125.703 kN/

m^{2}

. If the atmospheric pressure is taken as 101.325 kN/

m^{2}

, the gauge pressure in kN/

m^{2}

at this point would be

Q. The following parameters relate to the design of weirs on permeable foundations :

1. Scour depth 2. Exit gradient
3. Uplift pressure 4. Unbalanced head

Design of the downstream end pile of the weir depends upon

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Basic Concepts of Bligh’s Theory

HYDROLOGY & IRRIGATION

Watch in App

explore_more_icon

Explore more

Basic Concepts of Bligh’s Theory

Other Hydrology & Irrigation

Join BYJU'S Learning Program

CrossIcon