Retaining walls are structures used to resist the lateral pressure of soil, essential for stabilising slopes and creating levelled ground in construction areas. There are several types of retaining walls, each with particular characteristics that make them suitable for specific situations. Let’s review the most common ones and when it is most appropriate to use each.
Types of retaining walls and when to use them
What are gravity retaining walls?
These walls depend on their own weight to resist soil pressure. They are made of heavy materials such as concrete or stone. Thanks to their robustness, they are ideal for low to moderate heights and their construction is relatively straightforward, although they need more space, since their base must be wide to ensure stability. One advantage is that they adapt very well to uneven terrain.
When to use cantilever retaining walls?
These walls are quite common and are designed in an inverted “L” or “T” shape. They rest on a footing and are efficient for moderate to high heights. Their design distributes the weight of the soil towards the base, providing stability without needing a large volume of material. They are useful in both urban construction and roads where space is limited. An interesting note is how cantilever walls are designed according to Spanish concrete structure regulations, covered by the Technical Building Code (CTE).
How do anchored retaining walls work?
They are a solution for situations where other types of walls do not provide enough strength. Anchored walls include cables or bars that extend into the soil or rock behind the wall, anchoring the structure. They are perfect for supporting large loads and greater heights, and are frequently used in deep excavation projects.
Advantages of using precast retaining walls
Precast walls have gained popularity thanks to their quick and efficient installation. They are made of modules assembled on the project site. Although they may be more expensive initially, the reduction in installation time can make up for it on projects where this variable is critical. The adaptability of these walls to different designs and their aesthetic finish are other reasons to consider them.
Frequently asked questions (FAQ)
What are the key regulations in Spain for retaining walls?
The key regulation is the Technical Building Code (CTE), which covers aspects of structural safety and use of materials.
Which factors are crucial when deciding the type of retaining wall?
The wall height, the type of soil, the budget and the available space are essential for making the best decision.
Do retaining walls need maintenance?
Yes, especially wooden ones or those exposed to extreme weather. Regular maintenance will help identify problems such as cracks or inadequate drainage.
Did you know that retaining walls can also contribute to landscape design, turning sloping terrain into functional and visually attractive areas? So they are not only a structural matter but also an aesthetic one, combining engineering with a touch of design. A good example of how engineering can transform a space while respecting both the environment and safety.
