Geocell for subgrade
Wide Range of Applications
· Railway Subgrade: Prevents ballast settlement and enhances overall stability; has been successfully applied on heavy-haul railway lines such as the Lalin and Jingshen Railways.
· Soft Soil Treatment: Replaces traditional soil replacement methods, avoiding large-scale excavation and earthwork transportation; suitable for weak subgrades such as wetlands, saline soils, and expansive soils.
· Permafrost and Desert Regions: In permafrost areas like the Qinghai-Tibet Plateau, a double-layer structure effectively resists deformation caused by freeze-thaw cycles; in desert environments, it stabilizes sand and ensures subgrade stability.
A geocell for subgrade applications is a three-dimensional honeycomb-like grid structure formed by ultrasonic welding of high-strength HDPE (high-density polyethylene) sheets. It is widely used in road, railway, and embankment engineering projects to enhance subgrade bearing capacity, control settlement, and prevent lateral displacement. Its primary function is to provide lateral confinement to infill materials (such as gravel and sand) through the three-dimensional cellular structure, thereby improving overall stiffness and stability. It is particularly suitable for complex geological conditions such as soft soil foundations, steep slopes, and permafrost regions.
Main Functions and Advantages:
1. Enhanced Load-Bearing Capacity
Geocells disperse concentrated loads over a wider area through their three-dimensional grid structure, significantly improving the subgrade's compressive and shear strength. Experimental data show that the use of geocells can reduce lateral deformation of subgrade by 50–70%, while increasing load-bearing capacity by more than 40%.
2. Control of Differential Settlement
In sections involving the connection of new and existing subgrades or cut-and-fill transition zones, installing two layers of geocells can reduce differential settlement by 7.8% compared to unreinforced conditions, delivering twice the effectiveness of geogrids. This is particularly important in highway expansion and reconstruction projects.
3. Convenient Construction and Low Cost
The material can be folded for transport and then unfolded on site, where it is filled with locally available gravel or soil. This approach reduces fill material usage by over 60%, decreases the frequency of mechanical compaction, and accelerates construction progress.
4. Wide Range of Applications
· Railway Subgrade: Prevents ballast settlement and enhances overall stability; has been successfully applied on heavy-haul railway lines such as the Lalin and Jingshen Railways.
· Soft Soil Treatment: Replaces traditional soil replacement methods, avoiding large-scale excavation and earthwork transportation; suitable for weak subgrades such as wetlands, saline soils, and expansive soils.
· Permafrost and Desert Regions: In permafrost areas like the Qinghai-Tibet Plateau, a double-layer structure effectively resists deformation caused by freeze-thaw cycles; in desert environments, it stabilizes sand and ensures subgrade stability.
