State the correct answer. Also, provide reasons to justify the statement in your

Question

State the correct answer. Also, provide reasons to justify the statement in your answer book along with the question number. Best five answers will be considered for this question. (i) Three clayey soils were classified as (a) CH (b) CL (c) CL-MH as per the Unified Soil Classification System. Which one of these soils would likely have the lowest saturated coefficient of permeability? (ii) Which one of the soils (a) SW (b) CL (c) CH classified as per the Unified Soil Classification System would be a suitable soil for use as pavement base material to withstand the frost action more favorably? (iii) The shear deformation-related positive pore-water pressures are typically higher in (a) Normally consolidated clays (b) Over-consolidated clays (c) Sandy soils (iv) The friction angle of a clayey soil was determined using three different triaxial tests (a) UU tests (b) CU tests and (c) CD tests using identical samples. Which one of these tests would provide the highest internal friction angle. (v) The saturated coefficient of permeability of a clayey soil compacted at three different water contents reflecting (a) Dry of optimum (b) Optimum (c) Wet of Optimum conditions, would be significantly different. Which water content (i.e, a, b or c) would you recommend to compact the soil to achieve the highest saturated coefficient of permeability. (vi) Which one of the soils (a) Sands (b) Normally Consolidated Clay (c) Over -Consolidated Clay will predominantly have elastic settlements? (vii)The pore-water pressures below the ground water table increases with depth for (a) Sands (b) Silts (c) Clays (d) All the soils (viii) The degree of saturation of a clayey soil will be equal to 100% when it is compacted at a water content equal to (a) Dry of optimum conditions (b) Optimum (c) Wet of optimum conditions (d) None of the above (ix) The shear strength equation proposed by Terzaghi extending the Mohr-Coulomb failure criterion, tau = c' + (sigma - u_w) tan phi' is valid for (a) Normally consolidated clays (b) Over consolidated clays (c) both Normally and over consolidated clays (d) none of the above (x) The Vane shear test is useful to determine the in situ shear strength of (a) stiff clay soils (b) sands and gravels (c) soft clayey and sensitive soils (d) none of the above

Explanation / Answer

1 option a, CH is correct.

Because soils with high compressibility will have low permeability.

2. Option a SW is correct.

For base material of pavement granular material is most desirable i.e. gravel and sand.

3. Option B is correct.

The shear deformations generally high in over consolidated soils.

4 option C is correct.

CD test will give high value of internal angle of friction

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