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QUESTION: 1

Determination of coefficient of permeability by means of afield pumping test can be done for

Solution:

QUESTION: 2

In a soil deposit of three layers of equal thickness, the permeabilities of first, second and third layers are in the ratio of 1 : 2 : 3. The ratio of average permeability in horizontal direction (k_{h}) to that in the vertical direction (k_{v}) will be

Solution:

Thickness of each layer is same i.e.

QUESTION: 3

Rise of water table above the ground surface causes:

Solution:

Water table above the ground surface acts as surcharge hence total stress also increases.

Also, and as u increases σ increases

QUESTION: 4

The water level in a lake is 5 m above the bed. The saturated unit weight of the lake bed soil is 20 kN/m^{3}. The unit weight of water is 10 kN/m^{3}. The effective vertical stress at 5 m depth below . the lake bed is

Solution:

QUESTION: 5

Due to rise in temperature, the viscosity and the unit weight of the percolating fluid are reduced to 60% and 90% respectively. If other things remain constant, the coefficient of permeability

Solution:

QUESTION: 6

Consider the following statements:

Capillary water in soils

1. Causes negative pore water pressure.

2. Reduces effective pressure

3. Increases bearing capacity

4. Reduces bearing capacity

Which of these statements are correct?

Solution:

Capillary water causes negative pore pressure, increases effective pressure and bearing capacity.

QUESTION: 7

Effective stress on soil:

Solution:

QUESTION: 8

In a falling-head permeability test, the time taken for the head to fall from 27 cm to 3 cm is 10 minutes, if the test is repeated with the same initial head, i.e., 27 cm, what time would it take for the head to fall to 9 cm?

Solution:

QUESTION: 9

The ratio of Darcy’s coefficient of permeability to porosity is known as:

Solution:

K_{p} = K/n

K_{p }= Coefficient of percolation

QUESTION: 10

The soils most susceptible to liquefaction are

Solution:

In loose saturated sands on disturbance soil molecules came closer and volume decreases and hence positive pore pressure is set up, as a result effective stress reduces and sudden loss in shear strength is observed which results into failure. Such phenomenon is called liquefaction of sands.

### Lecture 4 - EFFECTIVE STRESS

Doc | 5 Pages

### Importance of Effective Stress

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### Effective Stress in Soil

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