Question

Which factor does not contribute to the instability of slopes?

• A. Saturation of soil
• B. Presence of vegetation
• C. Rock type
• D. Consistency of soil

Hint:

Vegetation helps stabilize slopes by anchoring soil with roots and reducing erosion. It enhances stability rather than causing it.

Answer 1

The Correct Option is B

Step 1: Understand the factors affecting slope stability.
Slope instability occurs due to a reduction in shear strength or an increase in driving forces. Common contributing factors include:
Saturation of soil: Water reduces effective stress and weakens soil.
Rock type: Weak or fractured rocks reduce slope strength.
Consistency of soil: Soils with low cohesion are more prone to failure.
Step 2: Evaluate each option.
Saturation of soil: Contributes to instability by reducing shear strength.
Presence of vegetation: Helps stabilize slopes through root reinforcement.
Rock type: Affects stability depending on its strength and structure.
Consistency of soil: Influences how easily the soil fails under load.
Step 3: Select the correct option.
The factor that does not contribute to slope instability is: $$ \boxed{\text{Presence of vegetation}} $$