Question5 (a) Particle size analysis is typically used to describe a soil. What

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Question5 (a) Particle size analysis is typically used to describe a soil. What other information should be considered when evaluating the long-term stability of a soil for geotechnical purposes? (3 mark) (b) Name and briefly describe two properties of clay dominant soils that can create problems when using these soils for geotechnical purposes. (4 mark) (c) In the context of soil mechanics, soil water can be described as "free" water and "adsorbed" water. Explain briefly the difference between the two types of water that appear in soil. (3 mark)

Explanation / Answer

stability analysis: Slope stability is the resistance of inclined soil to failure by sliding or collapsing. It is carried out with the help of computers .Limit equilibrium methods investigate the equilibrium of a soil mass tending to slide down under the influence of gravity. Transitional or rotational movement is considered on an assumed or known potential slip surface below the soil or rock mass

2.Cracked foundations, floors, and basement walls are typical types of damage done by swelling soils. Damage to the upper floors of the building can occur when motion in the structure is significant.

Expansive soils will also shrink when they dry out. This shrinkage can remove support from buildings or other structures and result in damaging subsidence. Fissures in the soil can also develop. These fissures can facilitate the deep penetration of water when moist conditions or runoff occurs.

3. Free water is the kind of water, which are available without much of external force. They can be either run off or water at water table. Majority of the cases free water will be available after soil saturation. Absorbed water is the type, which are bound to the soil grains by certain forces acting between grain and water molecules. Like clays. This kind of water is hard to separate from soil and external pressure is necessary

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