“Types of Retaining Walls”, illustrating four commonly used retaining wall systems in civil engineering and construction.. At the top, the bold stone-style heading emphasizes the structural theme. Below it, the poster visually explains four main types: 1. Gravity Wall This wall relies on its own weight and mass to resist soil pressure. It is typically made of concrete, stone, or masonry and is suitable for lower heights. 2. Cantilever Wall A reinforced concrete structure that uses a base slab an