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BARC 2020: Soil Mechanics Nuclear Quiz 1

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Question 1

A soil suspension was mode, (having volume 1 litre) with sample of dry soil (G = 2.7) weighing 200g. In pipette method of sedimentation analysis. 10 ml suspension was removed from a depth of 25 cm. after 3 min. from starting. The dry weight of the sample is 0.4 gm.
Find the value of % finer?

Question 2

The Atterberg limits of a soil are LL = 68% and PL = 34% and it contains 85% by weight of clay. The water content of a sample is 45%. Determine the predominant clay mineral.

Question 3

Find out the amount of soil required to be excavated from a borrow pit in cubic meter. If the voids ratio of the borrow pit is found to be 1.4. assume the volume of the fill is 150000 cum and the voids ratio of the fill is 0.8.

Question 4

The total compression of soil due to consolidation

Question 5

For the construction of tower on a site, it was decided to preload the site as it was expected that the settlement will be too large. What will be coefficient of consolidation (in cm²/sec) from the consolidation test was prepared on a normally consolidated clay sample of height 2.1 cm in double drained condition and the following data are given.
t50=7 minutes.
σ1=23.5 kN/m² →e1=0.6
σ2=48 kN/m² →e2=0.54

Question 6

For an actual soil, the interconnected void spaces assumed to be a number of tortuous channel and the theoretical relationship for coefficient of permeability derived by Kozeny- Carman is

Question 7

A gravity well has a diameter of 60 cm. The depth of water in the well is 40 m before pumping is started. When pumping is being done at the rate of 2000 litres per minute, the drawdown in a well 10 m away is 4 m and in another well 20 m away is 2 m. What will be the radius (in m) of zero drawdown?

Question 8

The depth of river is increased by 2m due to rainfall. What is the rise in vertical effective stress (KN/m² ) 3m below the ground level ?

Question 9

An undisturbed sample of soil has volume of 350 cc and weighs 490 g. After oven drying, its weight reduced to 450 g. Determine the water content (%) and & degree of saturation (s). Assume G = 2.7.

Question 10

An unconfined compression test was performed on a sample of moist sand which failed at an axial stress of 120 kPa. If the failure plane makes an angle 60

with the horizontal, the apparent cohesion of the soil is __ kPa.

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ESE & GATE CE Geotechnical Engineering

Sep 15ESE & GATE CE