Geotechnical Engineering

Seepage Analysis

Question 1
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.
Question 2
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 3
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 4
Marks : +2 | -2
Pass Ratio : 100%
In homogeneous soil, every transition in the shape of curves drawn in flow net must be ____________
Smooth
Sharp
Rough
All of the mentioned
Explanation:
According to practical suggestion given by A.Casagrande, every transition in the shape of curve is smooth, being either elliptical or parabolic in shape.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
A complete design of dewatering system consist of ___________
Spacing of wells
Penetration of wells
Pumping capacities
All of the mentioned
Explanation:
Complete design of dewatering system consists of the diameter and spacing of well points or wells, penetration of wells and the pumping capacities.
Question 6
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 7
Marks : +2 | -2
Pass Ratio : 100%
The seepage analysis is done on the assumption of ____________
Flow is laminar and Darcy’s law is valid
Seepage of water
None of the mentioned
All of the mentioned
Explanation:
The seepage analysis is done on the assumptions that the flow is laminar and Darcy’s law is valid and further assumed that the soil to be dewatered is homogeneous and isotropic.
Question 8
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 9
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 10
Marks : +2 | -2
Pass Ratio : 100%
The Darcy’s law governing the flow of water through is related to which of the following law?
Ohm’s law
Stokes law
Faraday’s law
None of the mentioned
Explanation:
The electric models suggested by ohm, have the same geometric shape as the soil through which the water flows. And both Darcy and ohm’s law have corresponding analogous quantities.