GATE CE topic:foundation-engineering PYQs & Answers — Page 8

Questions 71–78 of 78. Imported answers require independent review unless marked reviewed.

A rigid smooth retaining wall of height 7 m with vertical backface retains saturated clay as backfill. The saturated unit weight and undrained cohesion of the backfill are 17.2 kN/m³ and 20 kPa, respectively. The difference in the active lateral forces on the wall (in kN per meter length of wall, up to two decimal places), before and after the occurrence of tension cracks is _____

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Consider a rigid retaining wall with partially submerged cohesionless backfill with a surcharge. Which one of the following diagrams closely represents the Rankine’s active earth pressure distribution against this wall?

Your answerChoose one option.

Diagram for Civil Engineering question 6

Diagram for Civil Engineering question 6 (figure 2)

Diagram for Civil Engineering question 6 (figure 3)

Diagram for Civil Engineering question 6 (figure 4)

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A uniformly distributed line load of 500 kN/m is acting on the ground surface. Based on Boussinesq’s theory, the ratio of vertical stress at a depth 2 m to that at 4 m, right below the line of loading, is

Your answerChoose one option.

0.25

0.5

2.0

4.0

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The plate load test was conducted on a clayey stratum by using a plate of 0.3 m × 0.3 m dimensions, and the ultimate load per unit area for the plate was found to be 180 kPa. The ultimate bearing capacity (in kPa) of a 2 m wide square footing would be

Your answerChoose one option.

180

120

200

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Two identical concrete piles having the plan dimensions 50 cm × 50 cm are driven into a homogeneous sand layer as shown in the figures. Consider the bearing capacity factor N_q for φ = 30° as 24.

Diagram for Civil Engineering question 34

If Q_p1 and Q_p2 represent the ultimate point bearing resistances of the piles under dry and submerged conditions, respectively, which one of the following statements is correct?

Your answerChoose one option.

Q_p1 > Q_p2 by about 100%

Q_p1 < Q_p2 by about 100%

Q_p1 > Q_p2 by about 5%

Q_p1 < Q_p2 by about 5%

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Consider a square-shaped area ABCD on the ground with its centre at M as shown in the figure. Four concentrated vertical loads of

kN are applied on this area, one at each corner.

Diagram for Civil Engineering question 44

The vertical stress increment (in kPa, up to one decimal place) due to these loads according to the Boussinesq’s equation, at a point 5 m right below M, is

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It is proposed to drive H-piles up to a depth of 7 m at a construction site. The average surface area of the H-pile is 3 m

per meter length. The soil at the site is homogeneous sand, having an effective friction angle of 32°. The ground water table (GWT) is at a depth of 2 m below the ground surface. The unit weights of the soil above and below the GWT are 16 kN/m

and 19 kN/m

, respectively. Assume the earth pressure coefficient,

, and the angle of wall friction,

. The total axial frictional resistance (in kN, up to one decimal place) mobilized on the pile against the driving is

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The infinite sand slope shown in the figure is on the verge of sliding failure. The ground water table coincides with the ground surface. Unit weight of water

kN/m

Diagram for Civil Engineering question 47

The value of the effective angle of internal friction (in degrees, up to one decimal place) of the sand is

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GATE CE topic:foundation-engineering PYQs

Question 47

Question 6

Question 11

Question 17

Question 34

Question 44

Question 46

Question 47