Why Retaining Walls Collapse

Summary by Krater

This video explains the mechanics of retaining walls used in civil engineering, detailing how different types of walls like gravity, cantilever, soil nailed, anchored, and pile walls resist lateral earth pressure and prevent slope failures.

From the video

Answers: How do retaining walls work and what are the different types?

• Retaining wall engineering
• Lateral earth pressure
• Gravity walls
• Cantilever walls
• Mechanically stabilized earth
• Soil nailing
• Anchored walls
• Pile and secant pile walls

What it concludes

• For long-term stability, engineers rarely trust slopes steeper than 25 degrees.
• Retaining walls are essentially dams that hold back earth instead of water.
• Extending the footing inward into the retained soil is more beneficial than extending it outward.
• Gravity walls rely on their own weight and the weight of the soil above them for stability.
• Soil nails and anchors use unbonded lengths to act like rubber bands to store tension force.
• Most walls taller than 4 feet or 1.5 meters require design by a professional engineer.