18 Questions
Granular soils, such as sand, typically exhibit which of the following properties?
Low cohesion and high internal friction
Which parameter describes the resistance of soil to shear deformation due to friction between soil particles?
Angle of internal friction
Which criterion is commonly used to describe the relationship between shear stress and normal stress on a plane within a soil mass?
Mohr-Coulomb failure criterion
Failure in soil occurs when the shear stress on a plane reaches a critical value determined by which of the following?
Cohesion and angle of internal friction
Which type of soil is primarily composed of organic matter and lacks significant cohesion?
Peat
What effect does an increase in moisture content typically have on the shear strength of cohesive soils?
It decreases the shear strength
What type of stresses does a triaxial shear test involve?
Combined normal and shear stresses
What is indicated by the Mohr-Coulomb failure envelope passing through the origin for a soil sample with no cohesion?
The soil's shear strength is dependent on the angle of internal friction only
What does the intersection point of the Mohr-Coulomb failure envelope with the shear stress axis represent?
The maximum possible shear stress the material can withstand
What are the primary shear strength parameters of soil?
Cohesion and angle of internal friction
What type of soils are often tested using the triaxial shear test?
Clayey soils
What is the main purpose of a consolidation test?
To determine the settlement of a soil
What is the effect of faster shearing rates on the measured shear strength of clayey soils?
Increased shear strength due to rapid pore pressure build-up
What is the primary reason for applying a confining pressure in a triaxial shear test on a sandy soil sample?
To simulate the in-situ lateral stress conditions the soil experiences
What is a limitation of the direct shear test in determining failure planes?
The failure plane is artificially created and may not represent the plane of weakness in situ
What is the effect of slower shearing rates on the shear strength of clayey soils?
Increased shear strength due to soil consolidation
Why is the triaxial shear test preferred over the direct shear test for some soil types?
The triaxial shear test can simulate in-situ lateral stress conditions
What is the effect of confining pressure on the shear strength of a sandy soil sample?
Increases the shear strength by simulating in-situ lateral stress conditions
This quiz explores the relationship between the rate of shearing in a direct shear test and the measured shear strength of clayey soils. Understand the effects of different shearing rates on soil strength.
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