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AE-JE Foundation CE: Soil Mechanics Quiz 4
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Question 1
Which of the following statements regarding ‘Quick sand’, are correct
1. This phenomenon takes place mainly in fine sands.
2. It takes place in case of upward seepage flow.
3. It takes place at a hydraulic gradient of about 1.
4. Human beings and animals are not sucked into a quicksand.
Question 2
A coarse-grained soil has a void ratio of 0.78 and specific gravity as 2.67. The critical gradient at which a quick sand condition occurs will be
Question 3
A 1.5 m layer of soil is subjected to an upward seepage head of 2.0 m. A layer of coarse sand is laid above the soil layer to attain a factor of safety of 2 against piping. Both the soil and coarse sand have the same value of G = 2.60 and
e = 0.65. There is a negligible head loss in the sand layer. The required depth (in m) of the coarse sand layer is
e = 0.65. There is a negligible head loss in the sand layer. The required depth (in m) of the coarse sand layer is
Question 4
Which one of the following represents the correct relationship between seepage pressure (ps), unit weight of water (γw) and hydraulic gradient (i) inside an earth dam?
Question 5
If the specific gravity and voids in soil sample are G and e respectively, the critical hydraulic gradient i, is ______.
Question 6
The flow lines and equipotential lines in a flow net are in the shape of
Question 7
The portion between two successive flow lines in a flow net is referred as
Question 8
A flownet of a cofferdam foundation has 6 flow channels and 18 equipotential drops. The head
loss during seepage is 6 m. If the coefficient of permeability of soil is 4 x 10-5 m/min, then the seepage loss (m3/day) is :
loss during seepage is 6 m. If the coefficient of permeability of soil is 4 x 10-5 m/min, then the seepage loss (m3/day) is :
Question 9
A flownet of a cofferdam foundation has 6 flow channels and 18 equipotential drops. The head loss during seepage is 6 m. If the coefficient of permeability of soil is 4 × 10−5 m/min, then the seepage loss (m3/day) is
Question 10
A flownet below a dam consists of 24 equipotential drops and 7 flow channels. The difference between the upstream and downstream water levels is 6 m. The length of the flow line adjacent to the toe of the dam at exit is 1 m. The specific gravity and void ratio of the soil below the dam are 2.70 and 0.70, respectively. The factor of safety against piping is
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