For Midterm Flashcards
Stress due to soil and water only
Geostatic Stress
Stress due to construction of fills and foundations
Induced Stress
Stress perpendicular to the plane
Normal Stress
Stress parallel to the plane
Shear Stress
Plane without shear stress
Principal Plane
If the planes are parallel, stress are _____
equal
Condition where Effective stress is zero
Boiling or Quick Condition
If OCR=1
Normally Consolidated
If OCR >1
Overconsolidated
If OCR<1
Under consolidated
The internal resistance per unit area that the soil mass can offer to resist failure
Shear Strength
A material fails not because due to maximum Normal stress and Shearing Stress
Mohr
The relationship between Normal and Shear Stress is linear
Coulomb
Other term for the angle of internal friction
Angle of shearing resistance
Other term for minimum principal stress
- Confining pressure
- Lateral Pressure
- Radial Stress
- Cell Pressure
- Chamber Pressure
Other for the additional pressure
- Deviator Stress
- Plunger Stress
Other term for maximum principal stress
Axial Stress
2 components of shear strength
Cohesive and Frictional
Angle of Internal Friction is 0
Cohesion is also 0
Granular Soils
Angle of Internal Friction is -
Cohesion is greater than 0
Saturated
Example: Plastic Clay
Angle of Internal Friction is greater than 0
Cohesion is also greater than 0
General Case
In Direct Shear Test (DST), constant rate of shear displacement is applied.
Strain controlled test
In Direct Shear Test (DST), shear force is applied in equal increments
Stress Controlled Test
Dead weight is applied, compressive axial stresses at a constant rate and hydraulic pressure in all directions.
Triaxial Shear Test
Shear test where soil is always saturated
Triaxial Shear Test
Saturated specimen is subjected to an all-around confining pressure. Pore water pressure increases, drainage is then opened, excess water is dissipated and consolidation will occur.
Consolidated Drained Test (CD Test)
Soil drainage remains closed.
Consolidated Undrained Test (CU Test)
Pressures (exerted) and forces extended by the earth to retaining structures
Lateral Earth Pressure
