Question

b)	A sample of moist soil has a mass of 18.18kg and occupies a total volume of 0.009 m3. When dried in an oven, the dry mass is 16.13kg. The specific gravity of the soil solids is 2.70. (Acceleration of gravity, g = 9.81 m/sec2.) Determine:
	Wet density
	Dry unit weight
	Void ratio
	Water content
	Degree of saturation
c)	A 4.5 m deep deposit of silty sand lies above a 6 m deep deposit of gravel. The gravel is underlain by a deep layer of rock. The ground water table is found 2.3m below the ground surface. The soil properties are: ρbulk sand above GWT = 1750 kgm3 ρsat sand below GWT = 2010 kgm3 ρsat gravel = 2160 kgm3 Calculate vertical total stress, pore water pressure and vertical effective stress at the depths of 0, 2.3, 4.5 and 10.5 m.

Answer 1

The first part of question involves basics of soil mechanics formula and their relationship such as void ratio, dry density, bulk density, water content, and degree of saturation. The second part of question involves basics of stress relations such as total vertical stress, pore pressure and effective vertical stresses,