SOIL MECHANICS AND FOUNDATION ENGINEERING-I (CE-210) BOOKS 1.SOIL MECHANICS by T WILLIAM LAMBE & ROBERT V. WHITMAN, Wiley ASTERN 2.FOUNDATION ANALYSIS & DESIGN by JOSEPH E. BOWLES, Mc Graw Hills 3.GEOTECHNICAL ENGINEERING by SHASHI K GULHATI & MANOJ DATTA, TATA Mc Graw Hill 4.SOIL MECHANICS AND FOUNDATION ENGINEERING by B C PUNMIA, A K JAIN & A K JAIN, Laxmi Publications Pvt. Ltd.

THREE PHASE SYSTEM

PRELIMINARY RELATIONSHIPS

UNIT WEIGHTS RELATIONSHIPS

INTER-RELATIONSHIPS

PROBLEMS 1.A soil sample has a diameter of 38mm and a height of 76mm. Its wet weight is 1.15N. Upon drying its weight reduced to 0.5N. G is 2.7. In the wet state what was the Degree of Saturation and the water content of the soil sample. Also determine the void ratio, the porosity, total unit weight and the dry unit weight. 2.A soil deposit has a void ratio of 10.0 and the specific gravity of soil solids is 2.0. I.If S=100% determine its  ’ II.If S=90% determine its  ’ 3.If the soil has void ratio of 0.43 and a G of 2.7. Determine total unit weights of the soil when S=100%, 90%, 75% and 50%. 4.A soil sample has a porosity of 40%. The specific gravity of solids is Calculate void ratio, dry and total unit weight if the soil is 50% saturated and unit weight if the soil is completely saturated. 5.The unit weight of a soil equals 16.4 kN/m 3. The specific gravity of solids is Determine the void ratio under the assumption that the soil is perfectly dry. What would be the void ratio, if the sample has water content as 8%.

PROBLEMS 6.A natural soil deposit has a bulk unit weight of kN/m 3 and water content of 5%. Calculate the amount of water required to be added to 1 m 3 of soil to raise the water content to 15%. Assume the void ratio remains constant. What will then be the degree of saturation? Assume G= Calculate the unit weights and specific gravities of solids of (a) a soil composed of quartz and (b) a soil composed of 60% quartz, 25% mica and 15% iron oxide. Assume that both soils are saturated and have void ratio of Take G for quartz = 2.66 for mica = 3.0 and for iron oxide = A soil has a bulk unit weight of kN/m 3 and water content of 15%. Calculate the water content if the soil partially dries to a unit weight of kN/m 3 and the void ratio remains unchanged.

SOLUTION OF PROBLEM 1

SOLUTION CONTD.

HINTS TO PROBLEMS 2, 3 & 5

SOLUTION OF PROBLEM 4

SOLUTION OF PROBLEM 6

SOLUTION OF PROBLEM 7

SOLUTION OF PROBLEM 8