GATE CE topic:soil-mechanics PYQs & Answers — Page 10

Questions 91–100 of 103. Imported answers require independent review unless marked reviewed.

The compression curve (void ratio, e vs. effective stress, σ′v) for a certain clayey soil is a straight line in a semi-logarithmic plot and it passes through the points (e = 1.2; σ′v = 50 kPa) and (e = 0.6; σ′v = 800 kPa). The compression index (up to two decimal places) of the soil is ______

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At a construction site, a contractor plans to make an excavation as shown in the figure.

Diagram for Civil Engineering question 44

The water level in the adjacent river is at an elevation of +20.0 m. Unit weight of water is 10 kN/m³. The factor of safety (up to two decimal places) against sand boiling for the proposed excavation is _____

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The total horizontal and vertical stresses at a point X in a saturated sandy medium are 170 kPa and 300 kPa, respectively. The static pore-water pressure is 30 kPa. At failure, the excess pore-water pressure is measured to be 94.50 kPa, and the shear stresses on the vertical and horizontal planes passing through the point X are zero. Effective cohesion is 0 kPa and effective angle of internal friction is 36°. The shear strength (in kPa, up to two decimal places) at point X is ______

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A conventional drained triaxial compression test was conducted on a normally consolidated clay sample under an effective confining pressure of 200 kPa. The deviator stress at failure was found to be 400 kPa. An identical specimen of the same clay sample is isotropically consolidated to a confining pressure of 200 kPa and subjected to standard undrained triaxial compression test. If the deviator stress at failure is 150 kPa, the pore pressure developed (in kPa, up to one decimal place) is _____

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The void ratio of a soil is 0.55 at an effective normal stress of 140 kPa. The compression index of the soil is 0.25. In order to reduce the void ratio to 0.4, an increase in the magnitude of effective normal stress (in kPa, up to one decimal place) should be _____

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Let

be the specific gravity of soil solids,

the water content in the soil sample,

the unit weight of water, and

the dry unit weight of the soil. The equation for the zero air voids line in a compaction test plot is

Your answerChoose one option.

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Consider the following statements related to the pore pressure parameters,

and

: P.

always lies between 0 and 1.0 Q.

can be less than 0 or greater than 1.0 R.

always lies between 0 and 1.0 S.

can be less than 0 or greater than 1.0 For these statements, which one of the following options is correct?

Your answerChoose one option.

P and R

P and S

Q and R

Q and S

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A sheet pile has an embedment depth of 12 m in a homogeneous soil stratum. The coefficient of permeability of soil is

m/s. Difference in the water levels between the two sides of the sheet pile is 4 m. The flow net is constructed with five number of flow lines and eleven number of equipotential lines. The quantity of seepage (in cm

/s per m, up to one decimal place) under the sheet pile is ________.

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A 3 m thick clay layer is subjected to an initial uniform pore pressure of 145 kPa as shown in the figure.

Diagram for Civil Engineering question 22

For the given ground conditions, the time (in days, rounded to the nearest integer) required for 90% consolidation would be ____________

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Following are the statements related to the stress paths in a triaxial testing of soils: P. If σ₁ = σ₃, the stress point lies at the origin of the p-q plot. Q. If σ₁ = σ₃, the stress point lies on the p-axis of the p-q plot. R. If σ₁ > σ₃, both the stress points p and q are positive.

For the above statements, the correct combination is

Your answerChoose one option.

P – False; Q – True; R – True

P – True; Q – False; R – True

P – False; Q – True; R – False

P – True; Q – False; R – False

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GATE CE topic:soil-mechanics PYQs

Question 43

Question 44

Question 44

Question 45

Question 46

Question 4

Question 5

Question 21

Question 22

Question 35