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%
The exit gradient can be expressed by which of the following expression?
ie = Δ h/i
ie = Δ h.i
ie = l/h
ie = h/i
Explanation:
ie =Δ h /l, represent gradient formula where Δ h=potential drop and l is the average of last field in the flow net at the exit end.
Question 3
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 4
Marks : +2 | -2
Pass Ratio : 100%
Discharge for a unconfined aquifer can be found from the expression developed by __________
Dupuit
Darcy
Chapman
Baron
Explanation:
In 1956, chapmen developed an expression for finding the discharge qP from a partially penetrating slot in an unconfined aquifer from his model studies.
Question 5
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 6
Marks : +2 | -2
Pass Ratio : 100%
What will be the hydrostatic pressure if, hW = 30 % and Z = 10 %?
30%
10%
40%
50%
Explanation:
Using the formula, hW = h -Z
Question 7
Marks : +2 | -2
Pass Ratio : 100%
In discharge equation given by chapmen qp=kba(H-ho)/L+EA, EA refers to __________
Coefficient of permeability
Electric gradient
Extra length factor
Efficiency of permeability of soil
Explanation:
EA= extra length factor, which is a function of the ratio of slot penetration p to the thickness of pervious stratum b.
Question 8
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 9
Marks : +2 | -2
Pass Ratio : 100%
For fine-grained soil what type of dewatering system can be used?
Electro-osmosis method
Shallow well system
Deep well system
Vacuum method
Explanation:
For fine-grained soils, the well point system can be extended by the vacuum method.
Question 10
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.