Geo Technical Engineering-I B.Tech Question Paper : vardhaman.org

College : Vardhaman College Of Engineering
Degree : B.Tech
Department : Civil Engineering
Semester : V
Subject :Geo Technical Engineering-I
Document type : Question Paper
Website : vardhaman.org

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Vardhaman Geo Technical Engineering-I Question Paper

Four Year B. Tech V Semester Supplementary Examinations June – 2014
(Regulations : VCE-R11)
(Civil Engineering)
Date : 12 June, 2014 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks

Related / Similar Question Paper :
Vardhaman College B.Tech Design of Reinforced Concrete Structure Question Paper

All parts of the question must be answered in one place only

Unit – I

1. a) With the aid of schematic diagram, explain the principal clay minerals kaolinite, montmorillonite and illite. 7M
b) A soil sample with a water content of 15% is coated with paraffin wax of specific gravity 0.9. it displaced 135cc of water and weighs 2N. After the wax is peeled off, the sample weighs 1.4N. If the specific gravity of soil solids is 2.7, determine void ratio, porosity and dry unit weight of soil. 8M

2. a) List and explain the different clay minerals with a neat sketch. 7M
b) Classify the given soil as per I.S. classification System % passing IS 4.75mm sieve=86 % passing IS 75µ sieve=10 Cu=6.2,CC=1.5 Liquid limit=45 %, Plastic limit=20% 8M

Unit – II

3. a) List and explain the various factors affecting coefficient of permeability. 7M
b) It is observed that in 12min 800ml of water passes through a soil sample of 10cm thick and 75cm2 of C/S area under a head of 60cm. Determine the discharge velocity and coefficient of permeability. On over drying the sample weights 0.00685KN. Compute the seepage velocity assuming specific gravity of soil solids as 2.7. 8M

4. a) Define total stress, neutral and effective stress when related to soil. 7M
b) A clay stratum 6m thick lying below a sand layer 5m thick. The water table is at a depth of 2m from the surface. The sand has a porosity of 40% and G=2.7. Sand above water table may be taken as dry. Water content of soil in clay layer is 60% and clay soil has G=2.65. Calculate total stress, pore water pressure and effective stress at the middle of the clay layer. 8M

Unit – III

5. a) A laboratory compaction test on a soil having G=2.67 gave a maximum dry density of 18 kN/m3 and the moisture content is 12%. Find the degree of saturation, air content and percentage of air voids at the maximum dry density. Also find the theoretical maximum dry density with respect to zero-air voids at O.M.C 8M
b) Differentiate between normally consolidated and over consolidated soils. 7M
6. a) Define compaction. How does compaction differ from consolidation? 7M
b) Discuss the effect of compaction on properties of soil 8M

Unit – IV

7. a) A concentrated load of 500KN is applied on a soil mass, determine the intensity of vertical stress induced at a depth of 4m below the loading, at a distance of 3m from axis of loading at the same depth. Use Bousinessq and Westergaards theory. 8M
b) State the assumptions made in the Boussinesq’s and westergaard’s theory 7M
8. a) Explain the concept of ‘pressure bulb”? 8M
b) Discuss the construction of Newmark’s influence chart for vertical stress distribution 7M

Unit – V

9. a) Explain Mohr-coulomb’s failure theory? 8M
b) What are the advantages and limitations of vane shear test? Explain the method of conducting the test in the field? 7M
10. a) Define shear strength of soil. How soils are classified based on drainage conditions? 7M
b) Two identical specimens were tested in a triaxial apparatus at a cell pressure of 10KN/m2 and 20KN/m2. The corresponding deviator stresses were found to be 15KN/m2 and 25KN/m2. Determine the shear strength parameters of soil. Check your answers analytically. 8M