GATE, PSUs preparation- Soil Engineering ( notes)- Part 11

Hello there,
Welcome to the part 11 of the one liner notes useful for the preparation of GATE and other similar examinations.

1. For compaction of cohesion-less soils vibration techniques, flooding the soil and heavy weights dropping from a height are most suitable methods.
2. Standard split spoon sampler is most suitable soil sampler for saturated sands and other soft and wet soils.
3. Raft are used when structural load is uniform and soil is soft clay, made up of marshy land.
4. Piles are used when structural load is heavy and/or soil is having low bearing capacity for a considerable depth.
5. Footings are used when soil is having good bearing capacity at shallow depth and structural load is within permissible limit.
6. Well or pier is used when structural load of bridge is to be transferred through sandy soil to bed rock.
7. At critical void ratio, the void ratio does not vary with shear strain.
8. Vane shear test is performed on soft clay.
9. Standard penetration test is performed on sandy deposits.
10. Static cone penetration test is useful for end bearing and skin friction resistance determination.
11. Pressure meter test is useful for In-situ stress strain characteristics.
12. Differential settlement of foundation is hazardous because it leads to damage to superstructure.
13. Lowering of ground water table can cause settlement of foundation.
14. Consolidation and unconfined compression tests require undisturbed samples.
15. Clays which exhibit high activity contains montmorillonite and have a low plasticity index.
16. Size ranges of voids in soil also effect the permeability.
17. During seepage through an earth mass, the direction of seepage is perpendicular to the equipotential lines.
18. Limitation of direct shear test are plane of failure is predetermined, no control over drainage and there is non-uniform distribution of stresses.
19. Coulomb's theory assumes that failure occurs on a plane surface and failure wedge is a rigid body.

Thanks for visit.