CE6502 Foundation Engineering – Question Bank QUESTION BANK DEPARTMENT: CIVIL SEMESTER: V SUBJECT CODE: CE6502 SUBJECT NAME: FOUNDATION ENGINEERING UNIT 1- SITE INVESTIGATION AND SELECTION OF FOUNDATION PART – A (2 Marks) 1. List the various methods of soil exploration techniques. BT-1 2. Discuss the correction applied in SPT test. BT-2 3. Define depth of exploration. BT-1 4. Formulate the merits and demerits of wash boring. BT-6 5. Compare the various methods of site exploration BT-6 6. Summarize Augur boring. BT-2 7. Explain standard penetration number BT-6 8. Classify the corrections to be carried out in SPT test. BT-2 9. State the uses of soil exploration BT-1 10. What do you infer from soil exploration? BT-1 11. Write the different types of samplers. BT-3 12. Illustrate the various parameters affecting the sampling disturbance. BT-3 13. Summarize the advantages of SCPT over SPT. BT-2 14. Examine a report on spacing of bore holes. BT-1 15. Identify the difference between disturbed & un-disturbed samples. BT-1 16. Tabulate a note on representative and non-representative samples BT-1 17. Define liquefaction of sand BT-1 18. Formulate the importance of area ratio. BT-6 19. State the uses of Bore log report. BT-1 Prepared by Mr.MOGANRAJ/A.P Mr.KARTHICK S/A.P Mr.ARIVOLI/A.P CE6502 Foundation Engineering – Question Bank 20. The internal diameter of a sampler is 40 mm and the external diameter is 42 mm. Will BT-2 you consider the sample obtained from the sampler as disturbed or undisturbed? PART – B (16 Marks) 1. Enumerate the scope and objectives of methods of soil exploration. BT-6 2. Enlist the following samplers with neat sketches BT-2 (i) Split spoon sampler.(8) (ii) Thin walled sampler.(8) 3. With a neat sketch, explain the types of boring BT-2 (i) Auger boring(8) (ii) Wash boring(8) 4. Summarize a detailed report on various types of samplers BT-5 5. Discuss the factors incorporated in SPT test and tell about correction applied on same BT-2 6. Explain the various parameters which affect the sampling in detail BT-5 7. Illustrate the following types of Geophysical methods BT-3 (i) Electrical resistivity methods(8) (ii) Seismic refraction method(8) 8. Evaluate the selection of foundation location based on soil condition. BT-5 9. Explain dynamic cone penetration test. BT-1 10 Describe the salient features of a good sub-soil investigation report. BT-2 11 Prepare a report on the following BT-3 (i) Significant depth of exploration(6) (ii) Spacing of Bore holes(6) (iii) Site investigation report(4) 12 Mention the advantage and disadvantages of SPT test over SCPT test BT-1 13 Describe about following BT-4 (i) Soil Exploration Methods(12) (ii) Importance of area ratio(4) Prepared by Mr.MOGANRAJ/A.P Mr.KARTHICK S/A.P Mr.ARIVOLI/A.P CE6502 Foundation Engineering – Question Bank 14 Demonstrate the following methods BT-3 (i) Seismo electrical method(8) (ii) Well logging(8) UNIT 2- SHALLOW FOUNDATION PART – A (2 Marks) 1. Compare shallow foundation with deep foundation. BT-4 2. Discuss the factors to be considered while designing the foundation BT-2 3. Write the difference between bearing capacity and ultimate bearing capacity BT-6 4. Summarize Safe bearing capacity and Allowable bearing pressure BT-2 5. Explain ultimate bearing capacity with the help of load settlement curve. BT-5 6. Illustrate the different modes of shear failure BT-3 7. Relate local shear failure and General shear failure. BT-3 8. Write the procedure to find effective dimension eccentrically loaded footing. BT-3 9. Select the Assumptions & Limitations made in Terzaghi’s Analysis? BT-5 . 10. Estimate the factors affecting Bearing capacity. BT-2 11. Define Settlement. BT-4 12. Classify the components of settlement BT-2 13. Compare Co-efficient of volume change and volume change. BT-1 14. Distinguish between Immediate Settlement and consolidation settlement. BT-4 15. State primary consolidation and secondary consolidation. BT-1 16. What do you understand from Secondary compression settlement? BT-3 17. Tabulate the corrections to be made for the Settlement due to Consolidation. BT-1 18. Show the corrections made for the observed SPT values. BT-3 19. Criticize the factors affecting Bearing capacity. BT-4 Prepared by Mr.MOGANRAJ/A.P Mr.KARTHICK S/A.P Mr.ARIVOLI/A.P CE6502 Foundation Engineering – Question Bank 20. Examine the factors consider in seismic design of shallow foundation. BT-4 PART – B (16 Marks) 1. Explain the IS code recommendations for the location and depth of foundation. BT-3 2. Illustrate the different modes of failure of foundation soil. BT-3 3. Evaluate the following BT-5 (i)SPT(6) (ii) SCPT and Plate load test(10) 4. Calculate the Safe bearing capacity per unit area of BT-3 1. a strip footing 1 m wide(4) 2. a square footing 3m x 3m(4) 3. a circular footing of 3m diameter.(4) 4. a rectangular footing of 1.3x2.2m(4) 2 o Unit weight of the soil 1.8 t/m3, cohesion = 2t/m And Ф = 20 ,Nc = 17.5, Nq = 7.5 and N γ = 5. Depth of footing is 1.6m below ground surface. 5. An R.C. Column footing 2.26 m in square shape is to rest 1.5 m below level ground BT-3 3 level is on cohesive soil. The unit weight is 17.6kN/m . What is the safe load if 3 cohesion is 30kN/m factor of safety 2.4. Angle of internal friction 33° by IS code. 6. Design a strip footing to carry a load of 750kN/m at a depth of 1.6m in a cohesive soil BT-3 3 2 having unit weight of 18kN/ m & c=20kN/ m and angle of internal friction is 25 degree. Determinethe width of footing, using F.O.S as 3. Use terzhagi’s equations. Nc = 25.1, Nq = 12.7 and N γ = 9.7 7. In a plate bearing test on pure clayey soil failure occurred at a load of 12.2 tones. The BT-5 size of the plate was 45 cm x 45 cm and the test was one at a depth of 1.0 m below ground level. Find out the ultimate bearing capacity for a 1.5 m wide continuous wall footing with its base at a depth of 2m below ground level. The unit wt. of clay may be taken as 1.9 gm/ c.c. and Nc = 5.7, Nq = 1 and Nγ = 0. 8. A square footing located at a depth of 1.5 m below the ground surface in cohesionless BT-5 soil carries a column load of 1280 kN. The soil is submerged having an effective o unit weight of 11.5 kN/m3 and an angle of shearing resistane of 30 . Find the size of the following for Fs = 3 by Terzaghi’s theory of general shear failure. 9. A footing foundation of 3m X 3m is to be constructed at a site at a depth of 1.5 m below BT-5 ground level. The water table is at the base level of foundation. The average static cone Prepared by Mr.MOGANRAJ/A.P Mr.KARTHICK S/A.P Mr.ARIVOLI/A.P CE6502 Foundation Engineering – Question Bank 2 penetration resistance obtained at the site is 20 Kg/m .the soil is cohesive determine the safe bearing capacity for a settlement of 40mm. 10. Two plate load test s were conducted at the level of a prototype foundation in cohesion BT-5 less soil close to each other. The following data are given. Size of plate Load Settlement 0.3x0.3m 30 KN 25mm 0.6x0.6m 90 KN 25mm Find the size of the square footing to carry a load of 800 KN at the same specifying of settlement of 25mm 11. (i)An RCC foundation of size 18m x 36m have a uniform pressure of 180KN/m2 on a BT-5 soil mass with modulus of elasticity 45KN/m2.Determine the immediate settlement Assume poisons ratio as 0.5(10) (ii)Draw the pressure distribution of rigid footing in cohesive soil(4) 12. Summarize the following BT-5 (i) General Shear failure(6) (ii) Local shear failure(5) (iii) Punching shear failure(5) 13. (i) A footing 2m x 2m is at a depth of 1.5 m in a sand deposit for which the N BT-3 value is 27,Water table is at 2m from the Ground level. Determine the safe bearing capacity if the permissible settlement is 40 mm.(10) (ii) Write about influence of water table in determination of bearing capacity(6) 14. Write about the following methods of bearing capacity determination BT-3 (i) Terzhagi method(4) (ii) Meyerhoff method(4) (iii) IS Code Method(4) (iv) Skempton method(4) Prepared by Mr.MOGANRAJ/A.P Mr.KARTHICK S/A.P Mr.ARIVOLI/A.P CE6502 Foundation Engineering – Question Bank UNIT 3- FOOTINGS AND RAFTS PART – A (2 Marks) 1. Select the types of shallow foundations BT-2 2. Define spread or Isolated footing BT-1 3. Examine the behavior of Cantilever footing BT-4 4. Write about Raft or mat foundation BT-6 5. Evaluate the concept of eccentric loading BT-1 . 6. What are the circumstances necessitating combined footing? BT-1 7. Under what circumstances a rectangular and trapezoidal combined footings are adopted BT-1 8. Estimate the circumstances of strap footing adoption.