Structural Characteristics
Three-dimensional honeycomb structure: It is formed by ultrasonic welding or riveting of long strip plastic sheets and presents a honeycomb-like three-dimensional grid after being unfolded. This structure endows the geocell with strong lateral restraint force and large friction force, which can effectively restrain the filler and make it in a three-way stress state, thus improving the shear strength of the filler.
Good flexibility: It has good flexibility and can adapt to the undulations of different terrains, closely fit the ground and evenly transmit the load. It has obvious application advantages on uneven slopes or soft soil foundations. For example, in the treatment of high and steep slopes of mountainous highways, it can be laid along the shape of the slope to quickly stabilize the slope.
Good water permeability: The water permeability can avoid the problems of soil saturation and strength reduction caused by water accumulation, which is beneficial to maintaining the stability of the soil and reducing the erosion and damage of the slope caused by rainwater scouring and weathering.
Material Requirements
Tensile yield strength of sheet: Generally, it is required to be relatively high. For example, the tensile yield strength of the HDPE geocell for retaining wall reinforcement is ≥23mpa to ensure its tensile performance and enable it to withstand certain external forces.
Tensile strength at the welding joint: The tensile strength at the welding joint needs to meet certain standards, such as ≥100n/cm, to ensure that the joint is firm and reliable and prevent problems such as cracking at the welding joint during the use process.
Scope of Application
Highway slopes: It is suitable for the protection and support of slopes of highways at all levels, especially in the construction of mountainous roads. It can play an important role in the slope treatment at the semi-cut and semi-fill and the combination of filling and excavation, effectively prevent the sliding and collapse of the slope soil and ensure the safety of the road.
Railway engineering: It is also widely used in the protection of railway embankment and cutting slopes and the construction of retaining walls. It can adapt to the complex geological and topographical conditions along the railway and improve the stability of the railway slopes.
Water conservancy projects: It is used for the slope protection and retaining wall construction of water conservancy projects such as rivers, reservoirs and dams. It can enhance the anti-scouring ability of the slope, prevent soil erosion and protect the safe operation of water conservancy facilities.
Municipal engineering: In the slope support and landscape construction of municipal engineering such as urban roads, parks and squares, the geocell retaining wall can coordinate with the surrounding environment to achieve the effects of greening and beautification and at the same time play the role of stabilizing the soil.
Construction Key Points
Site preparation: Clean the construction site, remove debris, tree roots, etc., level and compact the foundation to ensure that the bearing capacity of the foundation meets the design requirements. If the foundation is weak, it needs to be reinforced.
Geocell laying: Unfold the geocell on the slope surface to make it closely fit the slope surface. The adjacent geocells need to be firmly connected, and connectors or welding and other methods can be used. During the laying process, pay attention to the direction and position of the cells to ensure that they meet the design requirements.
Filler selection and filling: Select appropriate fillers, such as sandy soil and gravelly soil. The filler should have good gradation and water permeability. Use the method of layered filling. The thickness and compactness of each layer of filler should meet the design requirements. During the compaction process, avoid damaging the geocell.
Wall protection: According to the needs of the project, a protective layer can be set on the wall surface of the geocell retaining wall, such as concrete panels and geogrids, to enhance the anti-scouring ability and durability of the wall surface.
Advantages
Good economy: Compared with the traditional rigid retaining wall, the geocell retaining wall can save engineering investment. Because it can be made high and steep, it can effectively save land and filler. At the same time, the construction is convenient and fast, which can shorten the construction period and reduce the construction cost.
Environmentally friendly: It has good ecological adaptability. After the construction is completed, the surface can be greened and integrated with the surrounding environment, playing the role of beautifying the environment and restoring the natural ecology, and having good social benefits.
Strong seismic performance: It is a flexible structure and can better adapt to deformation than the traditional rigid structure retaining wall. Under the action of external forces such as earthquakes, it can absorb energy through its own deformation, reduce the damage of the structure and improve the seismic capacity of the retaining wall.
