The production process of three-way geogrid is an integral punching and stretching type grille. First, the polymer board is punched and then integrally stretched, and the molecular orientation of polymer material is directionally arranged. It has unique characteristics such as shape and size of the mesh, shape and thickness of the ribs,integral nodes, high modulus values under low strain, plane stiffness values, and approximate isotropic in the plane, etc., so the three-way geogrid is superior to other types of grilles in the engineering performance.
Ⅰ.The mechanism of action
The backfill pellets are effectively interlocked in the mesh of three-way grille and form a flexible cushion with a certain stiffness together with the three-way grille. Through the interlocking action of the three-way grille on the pellets, the lateral displacement and expansion of pellets are effectively restrained, and the pellets are isolated from the underlying soil to ensure the effective thickness of cushion layer, thereby improving the bearing capacity of foundation, controlling the differential settlement, and prompting the stability of pellet layer.
Ⅱ.Performance of the three-way geogrid
The three-way grille has a unique triangular mesh structure. The nodes are integrated with the mesh to make the grille plane rigid and isotropic jointly work with the soil. The ribs of three-way grille have the strong thickness and its rectangular shape of section greatly increases the constraint on the pellets and the ability to spread the load.
1. The shape and thickness of ribs
The shape and thickness of ribs can effectively ensure the effect of constraining the pellets. The larger the thickness, the better the restraining effect. The cross section of ribs is a concave long rectangle, which is the best for constraining the pellets.
2. The size and shape of mesh
The mesh shape of the three-way grille is an equilateral triangle. Compared with the traditional two-way grille with square and rectangular mesh, its structural stability is better, and the mesh itself is not easily deformed under the load, so that the effect of constraining pellets is even better.
3. Node validity and plane stiffness
For the mesh stability, the stability of the triangular mesh is better than that of rectangular mesh. And for the nodes of three-way grille, there are six ribs on each node, so its node validity and integrity are greatly better than the two-way grille. Besides, the three-way grille is an integral punching and stretching type grille, and its mesh, ribs and nodes have unique properties, so the plane stiffness is much larger than other types of two-way grille.
4. Approximate isotropy on the plane
Conventional two-way grilles have the same strength and stiffness values in the longitudinal and transverse directions. And if the tensile test is performed in the 45 degree direction, the modulus is much smaller. However, for the three-way grille, if the performance in the direction of -60°, -30°, 0°, 30°, 60°, 90°, etc. is tested, the results indicate that the three-way grille have the approximately same stiffness in the 360°direction. . The modulus at low strain is closely related to the driving performance. Through a large number of driving experiments, that is, the wheels travel on the reinforced layer along different directions, it is found that the performance of the two-way grille in the 45-degree direction is much worse while the three-way grille just makes up for this defect. Under the action of load, The soil particles are subjected to various forces and are deformed in all directions. The three-directional grille can work well with the soil to restrain the deformation of the soil particles and improve the bearing capacity of the reinforced layer.
Ⅲ.The application field
1. Transportation areas such as railways and highways: the three-way geogrid is laid under the roadbed, high-filled sections and pile-top platforms. It replaces the traditional two-way stretching grille. There are many merits such as improving the bearing capacity of the foundation, controlling differential settlement, and shortening the construction cycle while saving costs. Up to now, its application range has reached about 16 million square meters in many railways and highways such as Fuzhou-Xiamen Railway, Hohhot-Kalgan High-Speed Railway, Handan-Huanghuagang Railway, Beijing-Hong Kong-Macau Expressway and Beijing-Chengde Expressway, etc.
2. Filed which needs to deal with the foundation such as airports, ports, etc.: the filling area of roadbed and the old and new road-surface joints in the old road reconstruction, etc. The three-way geogrid mainly solve the problem of insufficient bearing capacity of the soft soil foundation and effectively improves the bearing capacity. Additionally, for the new and old road-surface joints, it mainly solves the problem of controlling differential settlement. Up to now, its application range has reached about 5 million square meters of electricity in projects such as Dalian Port, Tianjin Binhai New District, Qingdao-Jiaodong International Airport, Tianjin military airport and Chengdu Airport, etc.
3. Chemical industry: The three-way geogrid is applied in many respects, such as the foundation, roads, slopes, etc. for new energy power generation systems (such as Dongying Wind Power, Shaanxi Photovoltaic Power, Yunnan Chuxiong Substation, etc.), controlling differential settlement for the foundation treatment in chemical industry plants (such as Sinopec, PetroChina and other tank bases and light industrial enterprises' in-plant roads, Fujian Sinopec refinery base, PetroChina LNG project in Guangdong, etc.) and the logistics stowage application (such as Dalian Port, Huanghua Port Project), etc. And its application range has reached about 3.6 million square meters.
4. Irrigation works and water transport: The three-way geogrid is mainly used in the filed such as the slope treatment of hydropower station , river widening and regulation, slope protection of river (South-to-North Water Transfer, Yellow River Diversion Project in Shanxi Province and other projects). At present, it is widely used in Hubei, Henan, Shanxi and Hebei with more than 2 million square meters.
The production process of three-way geogrid is an integral punching and stretching type grille. First, the polymer board is punched and then integrally stretched, and the molecular orientation of polymer material is directionally arranged. It has unique characteristics such as shape and size of the mesh, shape and thickness of the ribs,integral nodes, high modulus values under low strain, plane stiffness values, and approximate isotropic in the plane, etc., so the three-way geogrid is superior to other types of grilles in the engineering performance.
Ⅰ.The mechanism of action
The backfill pellets are effectively interlocked in the mesh of three-way grille and form a flexible cushion with a certain stiffness together with the three-way grille. Through the interlocking action of the three-way grille on the pellets, the lateral displacement and expansion of pellets are effectively restrained, and the pellets are isolated from the underlying soil to ensure the effective thickness of cushion layer, thereby improving the bearing capacity of foundation, controlling the differential settlement, and prompting the stability of pellet layer.
Ⅱ.Performance of the three-way geogrid
The three-way grille has a unique triangular mesh structure. The nodes are integrated with the mesh to make the grille plane rigid and isotropic jointly work with the soil. The ribs of three-way grille have the strong thickness and its rectangular shape of section greatly increases the constraint on the pellets and the ability to spread the load.
1. The shape and thickness of ribs
The shape and thickness of ribs can effectively ensure the effect of constraining the pellets. The larger the thickness, the better the restraining effect. The cross section of ribs is a concave long rectangle, which is the best for constraining the pellets.
2. The size and shape of mesh
The mesh shape of the three-way grille is an equilateral triangle. Compared with the traditional two-way grille with square and rectangular mesh, its structural stability is better, and the mesh itself is not easily deformed under the load, so that the effect of constraining pellets is even better.
3. Node validity and plane stiffness
For the mesh stability, the stability of the triangular mesh is better than that of rectangular mesh. And for the nodes of three-way grille, there are six ribs on each node, so its node validity and integrity are greatly better than the two-way grille. Besides, the three-way grille is an integral punching and stretching type grille, and its mesh, ribs and nodes have unique properties, so the plane stiffness is much larger than other types of two-way grille.
4. Approximate isotropy on the plane
Conventional two-way grilles have the same strength and stiffness values in the longitudinal and transverse directions. And if the tensile test is performed in the 45 degree direction, the modulus is much smaller. However, for the three-way grille, if the performance in the direction of -60°, -30°, 0°, 30°, 60°, 90°, etc. is tested, the results indicate that the three-way grille have the approximately same stiffness in the 360°direction. . The modulus at low strain is closely related to the driving performance. Through a large number of driving experiments, that is, the wheels travel on the reinforced layer along different directions, it is found that the performance of the two-way grille in the 45-degree direction is much worse while the three-way grille just makes up for this defect. Under the action of load, The soil particles are subjected to various forces and are deformed in all directions. The three-directional grille can work well with the soil to restrain the deformation of the soil particles and improve the bearing capacity of the reinforced layer.
Ⅲ.The application field
1. Transportation areas such as railways and highways: the three-way geogrid is laid under the roadbed, high-filled sections and pile-top platforms. It replaces the traditional two-way stretching grille. There are many merits such as improving the bearing capacity of the foundation, controlling differential settlement, and shortening the construction cycle while saving costs. Up to now, its application range has reached about 16 million square meters in many railways and highways such as Fuzhou-Xiamen Railway, Hohhot-Kalgan High-Speed Railway, Handan-Huanghuagang Railway, Beijing-Hong Kong-Macau Expressway and Beijing-Chengde Expressway, etc.
2. Filed which needs to deal with the foundation such as airports, ports, etc.: the filling area of roadbed and the old and new road-surface joints in the old road reconstruction, etc. The three-way geogrid mainly solve the problem of insufficient bearing capacity of the soft soil foundation and effectively improves the bearing capacity. Additionally, for the new and old road-surface joints, it mainly solves the problem of controlling differential settlement. Up to now, its application range has reached about 5 million square meters of electricity in projects such as Dalian Port, Tianjin Binhai New District, Qingdao-Jiaodong International Airport, Tianjin military airport and Chengdu Airport, etc.
3. Chemical industry: The three-way geogrid is applied in many respects, such as the foundation, roads, slopes, etc. for new energy power generation systems (such as Dongying Wind Power, Shaanxi Photovoltaic Power, Yunnan Chuxiong Substation, etc.), controlling differential settlement for the foundation treatment in chemical industry plants (such as Sinopec, PetroChina and other tank bases and light industrial enterprises' in-plant roads, Fujian Sinopec refinery base, PetroChina LNG project in Guangdong, etc.) and the logistics stowage application (such as Dalian Port, Huanghua Port Project), etc. And its application range has reached about 3.6 million square meters.
4. Irrigation works and water transport: The three-way geogrid is mainly used in the filed such as the slope treatment of hydropower station , river widening and regulation, slope protection of river (South-to-North Water Transfer, Yellow River Diversion Project in Shanxi Province and other projects). At present, it is widely used in Hubei, Henan, Shanxi and Hebei with more than 2 million square meters.
