GATE CE topic:soil-mechanics PYQs & Answers — Page 6

Questions 51–60 of 103. Imported answers require independent review unless marked reviewed.

In an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m² and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m², respectively are

Your answerChoose one option.

150 kN/m² and 0

100 kN/m² and 50 kN/m²

50 kN/m² and 100 kN/m²

0 and 150 kN/m²

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A partially-saturated soil sample has natural moisture content of 25% and bulk unit weight of 18.5 kN/m³. The specific gravity of soil solids is 2.65 and unit weight of water is 9.81 kN/m³. The unit weight of the soil sample on full saturation is

Your answerChoose one option.

21.12 kN/m³

19.03 kN/m³

20.12 kN/m³

18.50 kN/m³

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The most appropriate triaxial test to assess the long-term stability of an excavated clay slope is

Your answerChoose one option.

consolidated drained test

unconsolidated undrained test

consolidated undrained test

unconfined compression test

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As per the Unified Soil Classification System (USCS), the type of soil represented by ‘MH’ is

Your answerChoose one option.

Inorganic silts of high plasticity with liquid limit more than 50%

Inorganic silts of low plasticity with liquid limit less than 50%

Inorganic clays of high plasticity with liquid limit less than 50%

Inorganic clays of low plasticity with liquid limit more than 50%

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The cohesion (

), angle of internal friction (

) and unit weight (

) of a soil are 15 kPa, 20° and 17.5 kN/m³, respectively. The maximum depth of unsupported excavation in the soil (in m, round off to two decimal places) is ______.

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Two reservoirs are connected through a homogeneous and isotropic aquifer having hydraulic conductivity (

) of 25 m/day and effective porosity (

) of 0.3 as shown in the figure (not to scale). Ground water is flowing in the aquifer at the steady state.

Diagram for Civil Engineering question 24

If water in Reservoir 1 is contaminated then the time (in days, round off to one decimal place) taken by the contaminated water to reach to Reservoir 2 will be ______.

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A clay layer of thickness

has a preconsolidation pressure

and an initial void ratio

. The initial effective overburden stress at the mid-height of the layer is

. At the same location, the increment in effective stress due to applied external load is

. The compression and swell indices of the clay are

and

, respectively. If

, then the correct expression to estimate the consolidation settlement (

) of the clay layer is

Your answerChoose one option.

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Based on drained triaxial shear tests on sands and clays, the representative variations of volumetric strain (

) with the shear strain (

) is shown in the figure. Choose the CORRECT option regarding the representative behavior exhibited by Curve

and Curve

Diagram for Civil Engineering question 31

Your answerChoose one option.

Curve P presents dense sand and overconsolidated clay, while Curve Q represents loose sand and normally consolidated clay

Curve P presents dense sand and normally consolidated clay, while Curve Q represents loose sand and overconsolidated clay

Curve P presents loose sand and overconsolidated clay, while Curve Q represents dense sand and normally consolidated clay

Curve P presents loose sand and normally consolidated clay, while Curve Q represents dense sand and overconsolidated clay

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From laboratory investigations, the liquid limit, plastic limit, natural moisture content and flow index of a soil specimen are obtained as 60%, 27%, 32% and 27, respectively. The corresponding toughness index and liquidity index of the soil specimen, respectively, are

Your answerChoose one option.

0.15 and 1.22

0.19 and 6.60

1.22 and 0.15

6.60 and 0.19

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The soil profile at a construction site is shown in the figure (not to scale). Ground water table (GWT) is at 5 m below the ground level at present. An old well data shows that the ground water table was as low as 10 m below the ground level in the past. Take unit weight of water,

Diagram for Civil Engineering question 44

The overconsolidation ratio (OCR) (round off to two decimal places) at the mid-point of the clay layer is

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GATE CE topic:soil-mechanics PYQs

Question 7

Question 8

Question 10

Question 11

Question 23

Question 24

Question 30

Question 31

Question 35

Question 44