Question

Consider the following statements:

1. Knowledge about moisture content is necessary to determine permeability.

2. Some typical marine clay may have moisture content as high as 400%.

3. Sand bath method of moisture content determination is not suitable for soils containing organic matter.

Which of the above statements an correct?
1. 1, 2 and 3
2. 1 and 2 only
3. 2 and 3 only
4. 1 and 3 only

Answer 1

Correct Answer - Option 1 : 1, 2 and 3

Statement I – True

As per Kozney Karman Equation, Permeability can be given as:

\(K = C\frac{{{\gamma _w}}}{\mu }\frac{{{e^3}}}{{1 + e\;}}{d^2}\)

Where,

C is constant and d is particle size.

Further, void ratio and water content (w) have following relation:

S × e = w × G_s

From above, it can be concluded that knowledge about moisture content is necessary to determine permeability.

Statement II – True

The following are some properties of Marine Clay:

1. They are very soft and may contain Organic matter.

2. They posses very low shear strength and high compressibility.

3. Water content may range to any value or may reach to 400 %.

Statement III – True

Sand bath Method is quick filed method. In this method, container with moist soil is placed on sand bath and heated over kerosene stove. As there is no control over temperature, it is generally not suitable for organic soils and soils containing high gypsum content.

Results obtained from this method are inaccurate as it may also include structural water.