Question Paper: Geotechnics & Applied Geology : Question Paper Dec 2014 - Civil Engineering (Semester 3) | Gujarat Technological University (GTU)
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## 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)