Retaining Wall Design Principles: Geogrid & Surcharge

What happens here

Discuss the principles of retaining wall design, specifically when geogrid is necessary and how to determine its length. The rule of thumb for geogrid length is to match the height of the wall (e.g., a 6-foot tall wall needs 6 feet of geogrid). Geogrid layers are typically installed every 2 feet of wall height. The video also introduces the concept of 'surcharge,' which refers to any additional load placed on the soil behind the wall, such as a slope or a structure. Surcharge significantly increases the pressure on the wall, necessitating the use of geogrid even on walls under 4 feet tall.

Goal: Learn how to determine geogrid requirements and understand the impact of surcharge.