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Which of the following shear test is developed based on drainage conditions?
Quick test and Consolidated undrained test
Direct shear test
None of the mentioned
All of the mentioned
Quick test and Consolidated undrained test
Triaxial shear tests are classified based on drainage conditions during the consolidation and shearing phases. The 'Quick' (UU) test prevents drainage throughout, while the 'Consolidated Undrained' (CU) test allows drainage only during the consolidation phase, making them fundamentally defined by control of pore water drainage.
Triaxial shear tests are classified based on drainage conditions during the consolidation and shearing phases. The 'Quick' (UU) test prevents drainage throughout, while the 'Consolidated Undrained' (CU) test allows drainage only during the consolidation phase, making them fundamentally defined by control of pore water drainage.
╧ГтА▓=╧ГтИТu тАФ Effective stress principle where u is pore water pressure
╧ДfтАЛ=cтА▓+╧ГтА▓tan╧ХтА▓ тАФ Mohr-Coulomb failure criterion in terms of effective stresses
The principle relies on the control of drainage valves in a triaxial cell. In a quick test (UU), valves remain closed throughout the test to prevent volume change. In a CU test, drainage is permitted during the application of confining pressure (consolidation) but prohibited during the deviator stress application, allowing pore pressure measurement.
Unconsolidated-Undrained (UU): No drainage allowed at any stage.
Consolidated-Undrained (CU): Drainage allowed only during consolidation; closed during shearing.
Consolidated-Drained (CD): Drainage allowed throughout the entire test duration.
The choice of test depends on the field drainage conditions of the soil stratum being analyzed.
Allows simulation of specific field drainage conditions.
Provides information on pore water pressure generation (in CU tests).
CD tests are extremely time-consuming for low-permeability soils.
Complex setup required compared to direct shear tests.
Slope stability analysis.
Foundation settlement prediction.
Earth dam design.
| Feature | CU Test | CD Test |
|---|---|---|
Drainage Stage | Consolidation Phase | Shear Phase |
Option B (Direct shear test) is a specific apparatus, not a classification based on drainage stages.
UU tests are often used for saturated soils where rapid construction occurs.
A is correct тАФ Quick (UU) and Consolidated Undrained (CU) tests are specifically classified based on the drainage conditions permitted during the stages of testing.
Always remember that in saturated soils, the pore water pressure development is the primary factor limiting shear strength under undrained conditions.