Biaxial Tensile Geogrid

Biaxial tensile geogrid is a material that can be used in various construction projects. It can help stabilize roadways, preventing them from collapsing and becoming rutted. It can also prevent soil movement and increase the core bearing ratio of a road.

This article will use Abaqus software to conduct simulations of the biaxial stretching process of industrial PP geogrids with different schemes of pre-punched holes, and then analyze its shape and mechanical properties.

Material

Biaxial tensile geogrid is produced from high molecular polymer through extrusion, forming a matrix of ribs and junction knobs. The ribs have apertures that allow introduced aggregates to interlock, strike through or slide through the gaps. This enables them to distribute stress and strain evenly across the surface of the grid. This helps to stabilize soil and prevent road sinking and surface flaking. It is often used to strengthen parking lots, haul roads and airport runways. It also improves the load-bearing capacity of landfills and railway tracks.

The performance of a biaxial geogrid can be greatly improved by changing the size of its apertures. The smaller the aperture, the more it can contribute to the tensile strength and nominal elongation Biaxial tensile geogrid of the geogrid. This is because the nodes on the grid deform to varying degrees during the stretching process.

The mechanical properties of a biaxial geogrid can also be adjusted by changing the longitudinal and transverse spacings of its ribs. This can be done by using a computer simulation software, such as Abaqus. The study conducted by this company examined the effect of different diamond-shaped hole sizes on the ribs’ mechanical properties. It was found that if the longitudinal spacing is 1% larger than the transverse spacing, the ribs’ mechanical properties can be regulated. This also saves production costs by avoiding the use of expensive punching dies.

Production process

Unlike other geosynthetic materials, biaxial tensile geogrids have strength in both directions. This enables them to distribute heavy loads evenly over the subgrade, rather than concentrating the load on a small area. This helps to prevent soil displacement and prolong the life of a construction project. This material is ideal for use in sloping ground to prevent soil displacement. It is used in many projects, including highways, airport runways, railroad tracks and parking lots. It also improves the performance of sloping sites and reduces construction costs.

The production process of biaxial tensile geogrids consists of a series of steps: extrusion, rolling, plate pre-punching, one or two stretching at high temperature, cooling and setting at room temperature. Uniaxial geogrids are stretched only once, while biaxial tensile geogrids must be stretched longitudinally and transversely to achieve their tensile ratio.

Different pre-punched hole sizes have varying mechanical properties, so the length of the diamond-shaped holes is very important for biaxial tensile geogrids. The stress and strain of the biaxial tensile geogrid are related to the length of the hole, and the shape and stress-strain law can be analyzed by using Abaqus software.

The GBX Series of biaxial tensile geogrids has been developed from decades of proven technology, with high flexural rigidity and tensile strengths along the ribs and at the junctions. These features are essential for interlocking and confinement in Soil Stabilization and Base Reinforcement applications.

Properties

Biaxial tensile geogrids have high strength in both longitudinal and transverse directions. This property helps to distribute load evenly across the subgrade. This reduces the stress on the soil and enhances its bearing capacity, reducing construction costs and saving time. This is the reason why it is used for road and foundation reinforcement.

A biaxial geogrid is a plastic polymeric tension-resistant component made of two orthogonal sets of cross-linked polymer components that piscina de geomembrana are generally referred to as ribs. The apertures between these ribs create junctions that allow the soil to penetrate and interlock with them. The physical properties of a biaxial geogrid are determined by how the ribs intersect with each other, as well as their shape and size. These properties include rib width, junction efficiency, minimum rib thickness, and ultimate tensile strength.

Junction efficiency is an important physical property because it indicates the ability of the ribs to transfer stress and strain to the surrounding soil. It also determines how much strain can be sustained by the ribs before the subgrade fails. Minimum rib thickness is a distinguishing index property that tests the thickness of each rib. It is logical to assume that a thicker rib can sustain more stress than a thinner rib.

The mechanical properties of a biaxial geogrid can be tested by using the Abaqus hyperelastic constitutive model. It is also possible to examine the influence of the diameter-to-distance ratio and percentage difference between longitudinal and transverse spacing on its mechanical properties.

Applications

Biaxial tensile geogrids can be used in a variety of applications. For instance, they can be placed under roadways to stabilize the soil and prevent rutting or other ground surface problems. They also can be placed under embankments to strengthen the soil and prevent lateral movement. They are a good choice for construction projects that require strong, durable reinforcement materials.

The defining properties of a geogrid are its aperture and junction efficiency. The aperture refers to the size of the openings in the geogrid’s net-like voids. It also determines how introduced aggregates will interlock or strike through the ribs. Junction efficiency demonstrates how strong the junction is at each node, and it is an important factor in determining the ultimate tensile strength of the geogrid.

In industrial production, the main raw material for biaxial tensile geogrid is polypropylene. It is extruded from a melt into sheets with a thickness of 4 mm and then punched through using a punching die. An appropriate amount of plasticizer and antioxidant are added to improve the plasticity and thermal aging resistance of the material. In addition, 2% carbon black is also added to inhibit photoaging.

During the production process, the grids are always stretched longitudinally before being transversely stretched. In this way, the longitudinal ribs are less likely to be destroyed during the transverse stretching process. In addition, the longitudinal ribs are not reheated after being stretched transversely, which helps to ensure that their mechanical properties are not affected.