Soil Mechanics CE2251 Important Questions May June Anna Univ Exams 2013
Soil Mechanics 4th sem Civil Questions 2013
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Anna University May/June 2013 Examinations
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CE2251 - SOIL MECHANICS
1. The mass of wet soil when compacted in a mould was 19.55 kN. The water content of the soil was 16%. If the volume of the mould was 0.95 m3. Determine (i) dry unit weight, (ii) Void ratio, (iii) degree of saturation and (iv) percent air voids. Take G = 2.68
2.Sandy soil in a borrow pit has unit weight of solids as 25.8 kN/m3, water content equal to 11% and bulk unit weight equal to 16.4 kN/m3. How many cubic meter of compacted fill could be constructed of 3500 m3 of sand excavated from borrow pit, if required value of porosity in the compacted fill is 30%. Also calculate the change in degree of saturation.
3.A soil has a bulk unit weight of 20.11 KN/m3 and water content of 15 percent. Calculate the water content of the soil partially dries to a unit weight of 19.42 KN/m3 and the voids ratio remains unchanged
4.Explain Standard Proctor Compaction test with neat sketches.
5.Explain all the consistency limits and indices.
6.Explain in detail the procedure for determination of grain size distribution of soil by sieve analysis
7.The discharge of water collected from a constant head permeameter in a period of 15 minutes is 500 ml. the internal diameter of the permeameter is 5 cm and the measured difference in head between two gauging points 15 cm vertically apart is 40 cm. calculate the coefficient of permeability. If the dry weight of the 15 cm long sample is 486 gm and the specific gravity of the solids is 2.65, calculate the seepage velocity.
8. Explain in Detail About the methods of obtaining flow nets
9. Explain the falling head permeability test
10.Compute the total, effective and pore pressure at a depth of 20 m below the bottom of a lake 6m deep. The bottom of lake consists of soft clay with a thickness of more than 20 m. the average water content of the clay is 35% and specific gravity of the soil may be assumed to be 2.65
11.What are the applications of flow net and explain briefly
12.Explain with a neat sketch the Terzhaghi’s one dimensional consolidation theory
13.Explain the Newmark’s influence chart in detail.
14. What are the various components of a settlement? How are these estimated?
15. A stratum of clay with an average liquid limit of 45% is 6m thick. Its surface is located at a depth of 8m below the ground surface. The natural water content of the clay is 40% and the specific gravity is 2.7. Between ground surface and clay, the subsoil consists of fine sand. The water table is located at a depth of 4m below the ground surface. The average submerged unit weight of sand is 10.5 kN/m3 and unit weight of sand above the water table is 17 kN/m3. The weight of the building that will be constructed on the sand above clay increases the overburden pressure on the clay by 40 kN/m 2 . Estimate the settlements of the building.
16.Explain the assumptions made by Boussinesque in stress distribution on soils
17.Obtain the relationship between the principal stresses in triaxial compression test using Mohr-Coulomb failure theory
18.Explain with neat sketch Direct Shear method of finding Shear Strength
19.Explain the direct shear test to determine the shear strength of soil
20.Describe the triaxial shear test. What are the advantages of triaxial shear test over the direct shear test?
21.Explain with neat sketches the procedure of conducting direct shear test. Give its advantages over other methods of finding shear strength of soil
22.Explain the procedure to calculate the factor of safety of a finite slope possessing both cohesion and friction (c - Φ) by method of slices.
23.Explain with neat sketches the Bishop’s method of stability analysis
24.What are different types of slope failures? Discuss the various methods for improving the stability of slopes
25.Explain the Swedish slip circle method in detail.
26.Explain Taylor’s stability number and its applicability.
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