Rotational and Translational Slope Failures

The video discusses two main types of slope failures: translational and rotational. Translational failure occurs when soil mass slides over a slope, typically in infinite slopes, and is stable as long as shear strength exceeds shear stress. Rotational failure involves soil mass rotating around a point, common in finite slopes, and is stable when resisting moment exceeds driving moment. Rotational failures are further classified into toe, face, and base failures based on the depth factor.

What are the two main types of slope failures discussed in the video?

• Static and Dynamic

• Translational and Rotational

• Vertical and Horizontal

• Linear and Circular

In which type of slope is translational failure most commonly observed?

• Finite slopes

• Infinite slopes

• Steep slopes

• Gentle slopes

What condition must be met for a slope to be considered stable in terms of shear stress and shear strength?

• Shear stress equals shear strength

• Shear stress is less than zero

• Shear stress is greater than shear strength

• Shear strength is greater than shear stress

What is the factor of safety in the context of slope stability?

• Difference between shear stress and shear strength

• Ratio of shear stress to shear strength

• Ratio of shear strength to shear stress

• Sum of shear stress and shear strength

What is the main characteristic of rotational failure?

• Soil mass expands

• Soil mass rotates around a point

• Soil mass slides over the slope

• Soil mass remains static

What is the driving moment in rotational failure?

• Moment that stabilizes the slope

• Moment caused by external forces

• Moment caused by internal soil forces

• Moment that resists soil movement

Which type of rotational failure occurs when the failure mass passes through the toe of the slope?

• Toe failure

• Crest failure

• Face failure

• Base failure

What does a depth factor greater than 1 indicate in rotational failures?

• No failure

• Base failure

• Face failure

• Toe failure

If the depth factor is equal to 1, which type of failure is likely to occur?

• Base failure

• Toe failure

• Face failure

• No failure

What type of failure is indicated by a depth factor less than 1?

• Toe failure

• Base failure

• Face failure

• Crest failure