Soil Mechanics ...

The natural void ratio of a saturated soil sample is 0.6 and its density index is 60 %. If void ratio in loosest state is 0.9, (Assume G = 2.7) then

Which of the following statements are correct?

1. Stress Isobar can be prepared using Boussinesq’s stress distribution theory.

2. Equivalent point load method yields accurate results.

3. Newmark’s method relates the vertical stress with the help of influence chart.

4. Westergaard’s method helps in determination of stress distribution for layered soils.

Consider the following statements regarding permeability of soils:

1. Permeability of coarse grained soil is inversely proportional to the specific surface at a given porosity.

2. Direct measurement of permeability of a soil specimen at any stage of loading in odometer test can be made only in fixed-ring type odometer.

3. The permeability of an aquifer increases with decrease in temperature of water moving through it.

A soil mass contains 40% gravel, 50% sand and 10% silt. This soil can be classified as

Inorganic soil with low compressibility are represented by

Sieve analysis on a dry soil sample of mass 1000g showed that 980g and 270g of soil pass through 4.75 mm and 0.075 mm sieve respectively. The liquid limit and plastic limit of the soil fraction passing through 425 μ sieves are 40% and 18%, respectively. The soil may be classified as

A soil mass contains 40 % gravel, 50 % sand, and 10 %  silt. The soil can be classified as-

A cohesive soil yields a maximum dry density of 1.8 g/cc at an OMC of 16% during standard proctor test. The maximum dry density (in g/cc) to which the soil can be compacted further is ______. (Take specific gravity of soil solid (G) = 2.7)

In an undrained triaxial test on a saturated clay, the Poisson’s ratio is

Using Engineering News formula, the allowable load (Q_a) of a wooden pile hammered with a drop hammer (W = 30 kN), having free fall (H) 1.5 m, penetration in last blow (S) 5 mm, using empirical constant (C) as 2.5 and factor of safety as 6, will be

A sand sample has a bulk density of 20kN/m³ and a degree of saturation of 70%. If the specific gravity of soil grains is 2.65, the value of critical hydraulic gradient for the soil will be ( Assume γ_w = 10 kN/m³)

A retaining wall of height 10 m retains dry sand. In initial state, the soil is loose and has a void ratio of 0.5, γ_d = 18 kN/m² and ϕ = 30°. Subsequently, the backfill is compacted to void ratio 0.3, γ_d = 20 kN/m³ and ϕ = 35°. The ratio of initial passive thrust to final passive thrust (upto 2 decimal places) is __________.

The coefficients of permeability of a soil in horizontal and vertical directions are 3.48 and 1.5 m/day respectively. The base length of a concrete dam resting in this soil is 100 m. When the flow net is developed for this soil with 1:25 scale factor in the vertical direction, the reduced base length of the dam will be ………………. m

In a particular soil sample, laboratory analysis has yielded the following result:

1. Sand - 20%

2. Silt - 30%

3. Clay - 50%

Without using the textural chart, the correct textural classification of the soil would be

Sieve analysis on a dry soil sample of mass 1000 g showed that 980 g and 270 g of soil pass through 4.75 mm and 0.075 mm sieve, respectively. The liquid limit and plastic limits of the soil fraction passing through 425 m sieves are 40% and 18%, respectively. The soil may be classified as

For a sandy soil with soil grains spherical in shape and uniform in size, what is the theoretical void ratio?

A vane shear test was performed on saturated clay layer at the site and it is noted that a torque of 45 N-m was required to shear the soil. In order to remould the soil, the vane was rotated rapidly under the certain value of torque say “x”. If the sensitivity of the clay is 8, then calculate the value of “x” in N-m.

A clay sample has a void ratio 0.54 in dry state. The specific gravity of soil solids is 2.7, What is the shrinkage limit of the soil?

Consistency as applied to cohesive soils is an indicator of its

Water is flowing at a steady rate through a homogeneous and saturated horizontal soil strip of 10 m length. The strip is being subjected to a constant water head (H) of 5 m at the beginning and 1 m at the end. If the governing equation of flow in the soil strip is \(\frac{{{{\rm{d}}^2}{\rm{H}}}}{{{\rm{d}}{{\rm{X}}^2}}} = 0{\rm{\;}}\)(Where x is the distance along the soil strip), the value of H (in m) at the middle of the strip is ___________

The plasticity index and the percentage of grain size finer than 2 microns of a clay sample are 25 and 15, respectively. Its activity ratio is

The natural void ratio of a sand sample is 0.6 and its density index is 0.6. If its void ratio in the loosest state is 0.9, then the void ratio in the densest state will be

Which one of the following correctly represents the dry unit weight of a soil sample which has a bulk unit weight of γt at a moisture content of W%?

A soil has a liquid limit of 40% and plasticity index of 20%. The plastic limit of the soil will be

A soil has bulk density of 22 kN/m³ and water content 10%. The dry density is