With respect to shear strength of soils, refer to the following Assertion and Reason and select the correct statement from the options given. Assertion (A): For cohesionless soils, the failure does not occur on the plane of maximum shear stress. Reason (R): Failure in soil takes place due to shear failure when compressive load is applied.
Both A and R are true and R is not the correct explanation of A.
To address the assertion and reason provided with respect to the shear strength of soils, let's analyze each statement individually before deciding on the correct option.
Assertion (A): "For cohesionless soils, the failure does not occur on the plane of maximum shear stress."
Explanation: In cohesionless soils, such as dry sand, shear strength is primarily due to the friction between particles. Failure in such soils typically occurs along a plane where the shear stress is critical, which is not necessarily the plane of maximum shear stress. Instead, it commonly occurs at an angle to the major principal stress direction where the shear stress mobilizes the soil's frictional resistance effectively.
Reason (R): "Failure in soil takes place due to shear failure when compressive load is applied."
Explanation: This statement is generally true. In soils, when a compressive load is applied, the soil experiences stress changes, and shear failure is a common mode of failure, especially when the applied load induces sufficient shear stress to exceed the soil strength.
Analysis: Both the assertion and the reason are individually true. However, the reason given is a general statement about shear failure in soils and does not specifically explain why the failure does not occur on the plane of maximum shear stress for cohesionless soils.
Conclusion: The most appropriate option, considering the nature of the assertion and the reason provided, is: "Both A and R are true and R is not the correct explanation of A."
Similar Questions
Which of the following is a limitation of the Direct Shear Test?
Important Questions from Shear Strength
In a direct shear test, the soil load is subjected to more stress at the _______.
A soil sample is subjected to a hydrostatic pressure σ. The Mohr circle for any point in the soil sample would be
The expansion of soil due to shear at a constant value of pressure is called
In the triaxial compression test, the application of additional axial stress on the soil specimen produces shear stress on:
The angle of the failure plane with the major principal plane is given by
