Soft soil foundation has the characteristics of high water content, low bearing capacity and easy deformation, which greatly affects the stability of the foundation. Three-dimensional composite drainage net is a commonly used drainage material in engineering. So can it be used in soft soil foundation?
1. Structural characteristics of three-dimensional composite drainage net
Three-dimensional composite drainage net is a new type of drainage geotechnical material made of high-density polyethylene (HDPE) as raw material and processed by special extrusion molding process. It has a three-layer special structure: the middle ribs are rigid and arranged longitudinally to form a drainage channel; the ribs arranged crosswise up and down form a support to effectively prevent the geotextile from being embedded in the drainage channel. This structure enables the three-dimensional composite drainage net to maintain high drainage performance even under high loads. In addition, the double-sided bonded permeable geotextile further enhances its comprehensive performance of anti-filtration, drainage, breathability and protection.
2. The mechanism of action of three-dimensional composite drainage net in soft soil foundation treatment
1. Drainage and consolidation effect: laying three-dimensional composite drainage net in soft soil foundation can form an effective drainage channel to quickly drain the accumulated water in the foundation. It can reduce the water content of the foundation, accelerate the consolidation process of the soil, and improve the bearing capacity and stability of the foundation.
2. Blocking the rise of capillary water: There is often a problem of capillary water rise in soft soil areas, which will cause the foundation humidity to increase and affect the strength and stability of the foundation. The three-dimensional composite drainage net can block the rise of capillary water, keep the foundation dry, and improve the bearing capacity of the foundation.
3. Enhance the stability of the foundation: The three-dimensional composite drainage net not only has a drainage function, but also can form a composite structure with the soil. Through the interaction between the soil and the grid, the shear strength and bearing capacity of the soil are increased. This consolidation enhancement effect can improve the overall stability and safety of the foundation.
III. Application of three-dimensional composite drainage nets in soft soil foundation treatment
Three-dimensional composite drainage nets can be used in road maintenance and drainage systems. When the road ages and cracks form, most of the rainwater will enter the section. At this time, laying the three-dimensional composite drainage net directly under the road surface can replace the drainable foundation, collect and drain water, and prevent water from entering the foundation/subbase. In the construction of transportation infrastructure such as railways and tunnels, three-dimensional composite drainage nets are also often used in roadbed treatment and tunnel inner wall drainage treatment, which can solve the problem of water accumulation in the foundation and improve the stability and bearing capacity of the structure.
As can be seen from the above, the three-dimensional composite drainage net can be used in soft soil foundation treatment. It can solve the drainage problem in soft soil foundations and improve the bearing capacity and stability of the foundation.
Post time: Jul-22-2025
