Geosynthetically Confined Soil® (GCS®), also known as Geosynthetically Reinforced Soil (GRS), refer to engineered fill consisting of closely spaced alternating layers of geosynthetics and granular fill. The concept of reinforced soil has been around for millennia. In fact, sections of the Great Wall of China were constructed around 200 BC using alternating layers of grass and willow twigs and granular soils. The use of GCS® has been studied extensively by many DOT’s and organizations, including the National Cooperative Highway Research Program (NCHRP). This has led to wide-scale acceptance across the country of this approach. Typically, our GCS/GRS systems are used in conjunction with other technologies such as soil nail walls, micropiles, and retaining wall block facing.
Another well-known reinforced soil structure is a mechanically stabilized earth (MSE) wall. While the concept may appear similar to GCS®/GRS walls on the surface, there are some stark differences between MSE walls and GCS®/GRS walls. GCS walls are internally stable, utilize closely spaced geosynthetics, and develop a high factor of safety.
Our design-build experts can help assess the best approach for your next project.