GCS® Wall Performance
Although MSE and GCS® systems share similar ingredients, they behave very differently under stress. In conventional MSE systems, reinforcement is typically spaced far apart and functions primarily as a tieback, carrying tensile forces with minimal composite contribution from the backfill.
GCS® Walls are engineered to confine the backfill. With closely spaced inclusions, typically 8 to 12 inches, the reinforcement is not intended to “carry” the wall, but to restrict granular particle dilation. When dilation is prevented, the backfill behaves as a confined composite mass, and the failure mechanism shifts toward shearing through the soil particles rather than reinforcement pullout. This confinement-driven behavior is what allows GCS® elements to reach extremely high compressive resistance, with failure loads reported near 22,000 lbs/sf in controlled conditions.
A common approach includes 8-inch reinforcement spacing using woven geosynthetics with wide-strip tensile capacities in the range of approximately 100 to 400 pounds per foot, selected based on site demands and design requirements. Proper compaction is essential; uncompacted backfill will not densify under loading and can compromise confinement performance and long-term stability.
