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sampler.
Explain the principle of the direct shear test. What are the advantages of this test? What are its limitations?
Use Boussinesq’s theory and compute vertical stress values on a vertical plane located at radial distance of 1m away from a 200 kN point load acting at ground level. Compute the vertical stress values at 2 m, 3 m & 4 m depth.
A long natural slope in a C-φ soil is inclined at 12° to the horizontal. The water table is at the surface and the seepage is parallel to the slope. If a plane slip has developed at a depth of 4 m, determine the factor of safety. Take C = 8 kN/m², ϕ = 22° and γsat =19 kN/m³.
Determine the area ratio for the following soil samples and comment on the nature of samples obtained in each of the samples.
| Soil sampler | Outer diameter (mm) | Inner diameter (mm) |
|---|---|---|
| (a) Core cutter | 165 | 150 |
| (b) Split barrel | 51 | 35 |
| (c) Seamless tube | 51 | 48 |
What are the assumptions made in Terzaghi’s analysis of bearing capacity of a strip footing?
A clay specimen has unconfined strength of 100 kPa & is subjected to UU Triaxial test under a cell pressure of 100 kPa. Find its axial stress at failure.
Explain the basic difference in the bearing capacity computation of shallow and deep foundations.
Describe with a neat sketch how will you carry out the wash boring method of soil exploration.
In an unconfined compression test, a cylindrical sample of clay 8 cm long and 4 cm in dia., fails under a load of 80 N. Evaluate shearing resistance if failure occurs at 10% strain.
Determine the safe bearing capacity of a strip footing 1.5 m wide & 1.5 m depth, resting on a deep sand bed, consider γ = 18 kN/m³, and bearing capacity factors, NC = 35.5, Nq = 23.2, Nγ = 22 corresponding to ϕ=38° and factor of safety = 3. Use Terzaghi’s equation.
Compute the safe bearing capacity of a square footing 2.0 m × 2.0 m, located at a depth of 1.5 m below the ground level in a soil of unit weight 19 kN/m³,φ = 20˚, Nc = 17.7, Nq =7.4, Nγ = 5.0. Take factor of safety = 3. The water table is very deep. If the water table touches the base of the footing, find the reduction in safe bearing capacity. Use Terzaghi’s equation.
Discuss the various factors that affect the bearing capacity of a shallow footing.
A 60 cm diameter pile is driven into a homogeneous clay having, C = 50 kPa, α = 0.7. If the embedded length is 10 m, estimate the safe load. Take FOS = 2, and NC = 9.
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Official Gujarat Technological University (GTU) examination paper for Soil Mechanics (Winter 2024, B.E. · Civil Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.
3150615 Soil Mechanics
Official GTU PDF · Winter 2024
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