Introduce

Geocell is a three-dimensional mesh cell structure formed by high-strength welding of reinforced HDPE sheet material. Generally, it is welded by ultrasonic needle. Due to engineering needs, some holes are punched on the diaphragm.

Standards:ASTM-D-1238,ASTM-D-256,ASTM-D-790,ASTM-D-1525,ASTM-D-792

characteristic:

1. It can be stretched freely, can be retracted for transportation, and can be stretched into a mesh during construction, filled with loose materials such as soil, gravel, concrete, etc., to form a structure with strong lateral restraint and high rigidity.
2. The material is light, wear-resistant, chemically stable, resistant to light and oxygen aging, acid and alkali, and is suitable for soil conditions such as different soils and deserts.
3. High lateral limit and anti-slip, anti-deformation, effectively enhance the bearing capacity of the roadbed and disperse the load.
4. Changing the geocell height, welding distance and other geometric dimensions can meet different engineering needs.
5. Flexible expansion and contraction, small transportation volume; convenient connection and fast construction speed.

Fundamental：

The reason why the geocell has excellent efficacy and has attracted the attention of the engineering community should also start from its basic principle. When describing its principle in foreign literature, it is called “a honeycomb three-dimensional confinement system, which can significantly improve the performance of ordinary filling materials in load-bearing and insect erosion control applications in a wide range.” Its key principle is three-dimensional confinement. . We all know that when a car drives in the desert, two deep ruts will be pressed, the pressed part will sag deeply, and both sides of the rut will be raised high. If the vehicle behind continues to move along the rut, the subsidence part will sink further, and the bulge part will further bulge, until the bulge part rubs against the chassis of the car, and the sinking rut bury most of the wheels, and then cannot move forward. The reason for this is because when the external load acts on the surface of the foundation, according to the Prandtl’s theory and Taylor’s theory, it can be known that under the action of the concentrated load, the active zone 1 is compressed and sunk, and the force is decomposed to both sides and transmitted to the ground. The transition zone 2, the transition zone 2 is passed to the passive zone 3, and the passive zone will deform and bulge without restriction.
Features:
1. It can expand and contract freely, and can be retracted for transportation. It can be stretched into a mesh during construction and filled with loose materials such as soil, gravel, and concrete to form a structure with strong lateral restraint and high rigidity.
2. The material is light, wear-resistant, chemically stable, resistant to light and oxygen aging, acid and alkali, and is suitable for soil conditions such as different soils and deserts.
3. High lateral limit and anti-slip, anti-deformation, effectively enhance the bearing capacity of the roadbed and disperse the load.
4. Changing the geocell height, welding distance and other geometric dimensions can meet different engineering needs.
5. Flexible expansion and contraction, small transportation volume, convenient connection and fast construction speed. That is to say, once the load acts on the subgrade, a wedge-shaped active area will be formed under the load, and it will be squeezed through the transition area, so that the passive area will bulge. That is to say, the bearing capacity of the foundation is determined by the shear force along the slip line and the forces that move the active, transitional, and passive regions. The true process of the above principles can be clearly experienced not only on sand bases, but also on soft base roads, but the rate of formation is slower than that on sand. Even better subgrade materials cannot avoid lateral movement. The general highway subgrade is several meters higher than the ground, and it is not easy to absorb water and make slurry, but long-term settlement still exists. Investigating the reasons, rainwater infiltration, material loss, and subsidence of the base are some of the reasons. Under the action of long-term rolling of the roadbed and the vibration force, the lateral displacement of the material to both sides of the subgrade section is undeniably another important reason. . Taking the highways at all levels in our province as an example, it can be clearly felt that an “S”-shaped groove has been pressed out of the road surface on the main lane of the road. Some expressways are no exception. The bumps of the car driving on the roadway are obviously stronger than the feeling of driving on the overtaking zone, especially in the connecting section of the road and bridge (commonly known as “bridge jumping”). This trench-like subgrade settlement is a typical example of lateral slippage of subgrade materials.
There is no need to describe the conventional method of subgrade treatment in the project. The purpose is to improve the shear resistance and friction force of the foundation material, and reduce or delay the ability of the foundation material to move under the pressure or vibration of the load. Therefore, the requirements for materials in the project are inevitable. There are many strict restrictions. If the required materials cannot be obtained nearby, these materials need to be purchased. The cost of purchasing materials and transportation costs account for a large part of the entire project cost. With geocells, materials can be obtained locally or nearby, and even materials that cannot be used under normal circumstances can be used, thereby greatly reducing material purchase costs and transportation costs. Why is this so? The bearing situation of geocell The reaction force of the chamber and the lateral resistance formed by the friction between the filler and the cell wall inhibit the lateral movement tendency of the transition zone 2 and the passive zone 3, thereby improving the bearing capacity of the roadbed. After experiments, the apparent cohesion of medium-density sand can be increased by more than 30 times under the restriction of the cell. Obviously, if the shear resistance of the subgrade material can be increased or the movement of the three areas can be inhibited, the effect of improving the bearing capacity of the foundation can be achieved, which is the limitation principle of the geocell. As a new type of synthetic material, geocells have started a lot of research and development work in Europe and the United States in the late 1980s and early 1990s. Tests and field applications have proved that geocells can improve the dynamic load resistance of general fills and the protection of roadbeds. It has great effect in all aspects. In the early 1990s, on the basis of absorbing foreign advanced experience, China began the development and research of geocells, and made major breakthroughs in the treatment of road bed diseases and the application of fixed loose media. With the further understanding of the characteristics of geocells, it has been found that they have irreplaceable advantages of other geotextiles (geotextiles, geomembranes, geogrids, geomold bags, geonets, etc.), making them unique in many fields. application prospects。

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