Height Geocell – Benefits of Height Geocell in Earthquake-Resistant Retaining Walls

Height Geocell – Benefits of Height Geocell in Earthquake-Resistant Retaining Walls

Increasing the height of geocells increases its rigidity and reduces stress concentration in the soil. It also redistributes the loads and transmits them to the underlying soil evenly, thereby improving the overall bearing capacity of the system.

Moreover, the shear strength of soil-geocell interface increased by decreasing the pocket opening diameter (Fig. 10a). The shear resistance increment reached 31% when the failure plane passed through the middle of geocell height.

Convenient Installation

When installing Height Geocell, first prepare the site by removing all debris, vegetation and unacceptable soils from the slope area. Replace with acceptable materials and complete all earthwork per the job specifications. If Height Geocell separation between the foundation soil and infill material is required, install a geotextile fabric over the excavated trench and slope areas.

The direct shear test results indicate that the geometry of the geocell significantly increases soil shear strength, especially when the failure plane passes through the middle height of the geocell (Fig. 9a). This increase in shear strength is mainly due to the fact that the geocell increases the interface shear between the failed soil and its adjacent layer, which decreases the pull-out resistance of the failed soil.

Once the geocell is in place, fill each cell with aggregate to help secure it in place. Be sure to use compacting gravel to avoid the “quicksand effect” that can push the geocell out of place. Filling the cells to at least 2″ above the cell walls will help ensure proper compaction. If tendons are used, feed the tendons through the collapsed panels and tie them to a dead man anchor in the anchor trench. The Geocell is then ready to support the imposed load, reducing distortions and overall settlement while enhancing stability. The result is a stronger, more stable and durable base that will last longer.

Durability

As a new kind of reinforcement, geocells are widely used in flexible reinforced retaining wall projects. However, theoretical research on the deformation and failure mechanisms of geocells under earthquake needs to be further developed. In this paper, a shear box was built to conduct a series of direct shear tests on soils reinforced with different types of geocells. The results showed that the shear strength of the geocell-reinforced soil increases significantly with the pocket opening size.

In addition, the geocell-reinforced soil possesses considerable anisotropy in shear strength parameters. As shown in Fig. 9, the higher shear strength increment can be achieved when the middle height of geocell is closer to the failure plane. On the other hand, the shear strength increases less when the middle height of geocell is further away from the failure plane.

In addition to the shear test, plate loading tests were conducted on two layered road sections with geocell-reinforced soils, and their settlement potential was compared with that of a reference section without geocells. The results showed that geocells with 440 mm and 660 mm aperture sizes improved the settlement potential of the geocell-reinforced layer by 27% and 59%, respectively. In addition, the settlement potential decreased with the increase in the number of cells per unit area, which was confirmed by modeling results.

Convenience

Since the tensile stiffness of geocells depends geocell supplier on their height and aperture size, the DOE-RSM method is an effective tool for interpreting the variables’ interaction. This is because it can reduce the number of test specimens needed and provides an efficient interpretation of the resulting BCR. It can also reduce the time required for the testing of geocell-reinforced footings.

As the number of cells in a geocell increases, its flexural stiffness increases. This results in a reduction in the cumulative permanent deformations (CPD) of the footing. Moreover, the increased stiffness of the geocell allows it to restrain the heaving behavior of cohesive soils.

Studies have shown that the shear strength of soil can increase by up to 31% when the height of a geocell is reduced. However, it is important to note that shear strength increments are not effective when the failure plane passes through the edge of the geocell. This is due to local buckling and straining of the geocell walls, which immobilize the shear strength increments.

Another benefit of using a height geocell is that it can be used to distribute the load evenly in a footing. This is a critical factor in the design of long-term pavements. Studies have shown that the settlements of footings on a geocell mattress decrease as they move away from the center location, while heaving dominates at a distance of 45 cm. In contrast, the settlements of footings on hex-shaped geocells remain constant and significantly lower than those on rectangular, circular, and diamond-shaped geocells.

Adaptability

Changing the height of geocells increases their bending and shear rigidity, which redistributes the loads developed by the overlying soil to a wider area. It also prevents lateral displacements of the geocell-reinforced soil. However, when the flexural rigidity of geocells is too high, local buckling and straining may immobilize them, causing a deterioration in their performance.

As a result, a shear test was performed in a laboratory scale to study the influence of the aspect ratio (height-diameter ratio) of geocells on the interface shear strength between the soil and its edge. It was found that the shear strength increment was influenced by both pocket size and height, but that a lower aperture size increased the shear strength more significantly.

When the two layers of a geocell are placed tangent to each other, they increase the shear strength of the soil by up to 5%, but when they get farther apart during displacement, the shear strength between them decreases. It is important to keep the shear strength of the geocell-reinforced layer close to the shear strength of the soil, which is why a smaller aperture size should be used. Moreover, reducing the distance between the geocells during construction can also improve the shear resistance of the soil. Ultimately, this leads to a higher load-bearing capacity. In addition, it reduces the risk of soil bridging during earthquakes.

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