Soil Mechanics and Foundation Sheet 31

Given that Plasticity Inder (PI) of local soil = 15 and PI of sand = zero, for a desired PI of 6, the percentage of sand in the mix should be

To make certain that the backfill material is more previous than the soil to be drained, the relationship used is

In standard penetration test, the splitspoon sampler is penetrated into the soil stratum by giving blows from a drop weight whose weight (in kg) and free fall (in cm) are, respectively, 30 and 60 

Under load, the void ratio of a submerged saturated clay decreases from 1.00 to 0.92. What will be the ultimate settlement of the 2 m thick clay due to consolidation?

In the soil sample of a consolidometer test, pore water pressure is

A cormally consolidated clay layer settles 1 cm when the pressure increases frm $1 kg/c{m}^2 to 2 kg/c{m}^2$. Additional settlement for the same soil for further increase of pressure from $2 kg/c{m}^2 to 4 kg/c{m}^2$ will be

The appropriate triaxial test to assess the long-term stability of an unloading problem, such as excavation of a clay slope, would be the 

Consider the following statements

1.   Hydraulic gradient required to initiate "quick" condition is independent of the ratio of volume of voids to volume of

      solids in a soil mass.

2.   Initiation of piping under hydraulic structures can be prevented by increasing the length of low path of water.

3.   Seepage pressure is independent of the coefficient of permeability.

Of these statements

An initial cross-sectional area of a clay sample was 15 sq.cm. The failure strain was 25% in an unconfined compression test. The corrected area of the sample at failure would be

A clear dry sand sample is tested in a direct shear test. The normal stress and the shear stress at failure are both equal to 120 kN/m2.The angle of shearing resistance of the sand will be