Geotechnical Engineering

Seepage Analysis

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Who was the first to give a graphical method of flow net construction?
Casagrande
Darcy
Forchheimer
Kozney
Explanation:
The graphical method of flow net construction first given by Forchheimer in 1930, based on trial sketching.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
When dewatering system consist of number of well-points ___________ can be considered for a simplified solution.
Linear drainage limit
Seepage analysis
Flow of water
All of the mentioned
Explanation:
Where the dewatering system consists of a number of closely spaced well points or wells a simplified solution can be obtained by considering the lines of wells equivalent to a linear drainage slot.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
The drawdown curve in fully penetrated slot is based on the assumptions of _____________
Dupuit and Forchheimer
Darcy
None of the mentioned
All of the mentioned
Explanation:
Based on Dupuit-Forchheimer assumptions, the slope of the drawdown curve was assumed to be equal to hydraulic agent.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The application of electro-osmosis on dewatering of soil was developed by ___________
L. casagrande
Darcy
Chapmen
Dupuit
Explanation:
The application of electro-osmosis to dewatering of soil was largely developed by L. Casagrande.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The flow lines and equipotential lines are ____________
Parallel
Perpendicular
Elliptical
All of the mentioned
Explanation:
The flow lines and equipotential lines always meet at right angles to one another.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
A flow net can be used for which of the following purpose?
Determination of seepage
Determination of seepage pressure
Determination of hydrostatic pressure
All of the mentioned
Explanation:
A flow net can be utilized for determination of seepage, seepage pressure, hydrostatic pressure, and exit gradient.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
For unconfined flow, which of the following discharge slot is used?
Partially penetrating slot
Fully penetrating slot
None of the mentioned
All of the mentioned
Explanation:
Fully penetrating slot is used for both confined and unconfined case of flow.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The seepage medium can be replaced by ____________electric model having the same geometric shape.
Potential divider
Insulator
Electric conductor
Potentiometer
Explanation:
The seepage medium is replaced by an electric conductor consisting of water with some salt or dilutes hydrochloric acid.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
The hydrostatic pressure in terms of piezometric head can be calculated from which of the following equation?
hW = h – Z
hW = h + Z
hW = u/γW
hW = h/z
Explanation:
The equation hW=h – Z, can be used to plot pressure net representing lines of equal water pressure without the saturated soil mass since all the three quantities in the equation can be expressed a the percentage of total hydraulic head H.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Fine grained cohesive soil can be drained or stabilized by __________
Vacuum method
Electro-osmosis method
Shallow well system
Well point system
Explanation:
Dewatering of fine grained cohesive soil can be done only electro-osmosis method.