Download PTU B.Tech 2020 March Civil 5th Sem BTCE 502 Geotechnical Engineering Question Paper

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Roll No. [T T] [ ] Total No. of Pages : 02
Total No. of Questions : 09

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B.Tech.(CE) (2012 to 2017) (Sem.=5)
GEOTECHNICAL ENGINEERING
Subject Code : BTCE-502
M.Code : 70513
Time : 3 Hrs. Max. Marks : 60

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INSTRUCTION TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

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1) Answer briefly :

1. Explain the term principal stresses.
2. What do you understand by Index properties of soil?
3. What is the basic difference in compression behavior of granular and fine-grained soils?
4. Given : D10 = 0.1 mm, D30 = 0.41 mm, D60 = 0.62 mm. Write down soil classification as per 1498<1970.

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5. If w=40%, G=2.71, then calculate Ysat and Ydry in KN/m³.
6. Give complete name of soil groups: SM, GW-GM
7. Draw typical stress-strain curves for sandy soils
8. Define Skempton’s pore pressure parameter
9. Which type of roller is the most suitable for compacting subgrade with high plastic clays?

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10. Give any two assumptions of wedge theory.

SECTION-B

2) Give general engineering properties of different types of soils classified according to Indian standard classification system.

3) A ring footing of external diameter 8 m and internal diameter 4 m rests at a depth 2 m below the ground surface. It carries a load intensity 150 kN/m². Find the vertical stress at depths of 2, 4 and 8 m along the axis of the footing below the footing base. Neglect the effect of the excavation on the stress.

4) Explain concept of consolidation using Spring Analogy.

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5) A soil sample has a porosity of 30% the specific gravity of solids is 2.60. Calculate its

1. Void ratio,
2. Dry density
3. Unit weight if the soil is 50% saturated and
4. Unit weight if the soil is completely saturated

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6) Explain briefly about the effect of compaction on soil properties.

SECTION-C

7) The soil in a borrow pit has a void ratio of 0.90. A fill-in-place volume of 20,000 m³ is to be constructed with an in-place dry density 18.84 KN/m³. If the owner of borrow area is to be compensated at Rs. 1.50 per cubic metre of the excavation, determine the cost of compensation.

8) Explain and derive Terzaghi’s theory of one-dimensional consolidation. Also enlist its assumptions.

9) Write short notes on any two of the following :

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1. Sieve analysis
2. Triaxial shear test
3. Causes of over consolidation.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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