Geotechnics & Applied Geology - Dec 2014
Civil Engineering (Semester 3)
TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1 (a) What is the scope of geotechnical engineering in the field of civil engineering?(7 marks) 1 (b) What is weathering? Enumerate the type of weathering. Distinguish between physical and chemical weathering.(7 marks) 2 (a) A soil sample has a porosity of 40 percent. The specific gravity of solids is 2.70. Calculate (a) void ratio, (b) dry density, (c) unit weight if the soil is 50% saturated and (d) unit weight if the soil is completely saturated.(7 marks)
Answer any one question from Q2 (b) & Q2 (c)
2 (b) What is an earthquake? What are the causes of earthquakes? Describe in brief the types of earthquake waves.(7 marks) 2 (c) How is geology related to civil engineering? Discuss the scope of application of geological knowledge in the planning and execution of engineering works.(7 marks)
Answer any two question from Q3 (a), (b) & Q3 (c), (d)
3 (a) Define the following terms: (i) water content (ii) void ratio (iii) porosity (iv) Unit weight of solids (v) Air content (vi) Bulk Unit weight (vii)Specific gravity(7 marks) 3 (b) Discus in brief the importance of study of geology for a civil engineer.(7 marks) 3 (c) A soil sample has a liquid limit of 30%, plastic limit 17% and flow index of 13%.Natural water content of soil is 19%. Determine: (i) plasticity index (ii) liquidity index (iii) consistency index (iv) Toughness index(7 marks) 3 (d) Define laws of stratigraphy.(7 marks)
Answer any two question from Q4 (a), (b) & Q4 (c), (b)
4 (a) Enlist the various methods of water content determine and explain oven drying method.(7 marks) 4 (b) Define the terms: (i) permeability (ii) seepage (iii) coefficient of Permeability (iv) Darcy's law (v) flow net (vi) Discharge velocity (vii) Hydraulic gradient (i)(7 marks) 4 (c) Define a mineral describe in brief the various physical properties of minerals which help in their identification.(7 marks) 4 (d) Explain grain size distribution by sieve analysis.(7 marks) 5 (a) What are faults? How they are classified? Illustrate with neat and suitable diagram.(7 marks)
Answer any two question from Q5(a), (b) & Q5 (c), (d)
5 (b) What is texture of the soil?(7 marks) 5 (c) What are the purposes of the soil classification?(7 marks) 5 (d) Write short notes on the following: (i) water table and perched water table (ii) confined aquifer and unconfined aquifer(7 marks)