A wall is a vertical dividing surface. It divides space in buildings into rooms or protects buildings. It is usually made of stone or brick. Walls have two main purposes: to support the top part of buildings, and to divide space, giving protection from invasion, escape, and weather.
Types of retaining wall are:
- Anchored wall
- Cantilever wall
- Gravity wall
- Piling wall
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- "What is a Retaining Wall". www.allanblock.com.