Biaxial geogrid fabric is a product of plastic geogrid. Biaxial geogrid fabric is a square or rectangular polymer mesh formed by stretching. According to the different stretching directions during its manufacture, it can be uniaxial stretching and biaxial stretching. It punches holes on the extruded polymer sheet (mostly polypropylene or high-density polyethylene), and then performs directional stretching under heating conditions. The uniaxially stretched grid is made by stretching only along the length of the sheet, while the biaxially stretched grid is made by continuing to stretch the uniaxially stretched grid in the direction perpendicular to its length.
Since the polymer of the biaxial geogrid fabric will be rearranged and oriented during the heating and extension process during the manufacture of the plastic geogrid, the bonding force between the molecular chains is strengthened, and the purpose of improving its strength is achieved. Its elongation is only 10% to 15% of the original sheet. If anti-aging materials such as carbon black are added to the geogrid, it can make it have better durability such as acid resistance, alkali resistance, corrosion resistance and aging resistance.
Biaxial geogrid fabric is made of high molecular polymer through extrusion, plate forming, punching process, and then stretched longitudinally and transversely. The material has great tensile strength in both longitudinal and transverse directions. This structure can also provide a more effective force bearing and diffusion ideal interlocking system in the soil, which is suitable for permanent bearing in large areas.
Biaxial geogrid fabric is suitable for various dams and roadbed reinforcement, slope protection, cave wall reinforcement, and permanent bearing foundation reinforcement of large airports, parking lots, docks and freight yards.
CASE STUDY
- Location – Thailand
- Product(s) – Biaxial geogrid fabric
- Application – Road stabilization
Issue
The bearing capacity of the foundation is weak, the soil subsides and the road surface is full of large and small cracks. The bidder requires the construction time to be one and a half months. Our Thai client won the bid for the road construction project. Due to uneven roads and numerous cracks, the client planned to use HDPE geogrids for this project. According to the customer’s index, we offered the customer a 60kN-60kN plastic biaxial geogrid fabric, the quantity is 2*40HQ 58000 square meters. After a few days of communication, after confirming the details in terms of price, delivery time, and packaging, the customer started purchasing.
Why use HDPE geogrid for road stabilization?
HDPE Geogrid is a major geosynthetic material, which has unique properties and efficacy compared with other geosynthetics. Commonly used as reinforcement for reinforced soil structures or as reinforcement for composite materials. It has the following features.
The biaxial geogrid fabric has high strength and low creep, and it can adapt to various environmental soils, which can fully meet the use of tall retaining walls in high-grade highways. The geogrid fabric can effectively improve the interlocking and occlusal effect of the reinforced bearing surface, greatly enhance the bearing capacity of the foundation, effectively restrain the lateral displacement of the soil, and enhance the stability of the foundation.
Compared with the traditional grid, it has the characteristics of high strength, strong bearing capacity, corrosion resistance, anti-aging, large friction coefficient, uniform holes, convenient construction and long service life.
The biaxial geogrid fabric is more suitable for deep-sea operations and reinforcement of embankments, and fundamentally solves the technical problems of low strength, poor corrosion resistance and short service life caused by long-term erosion of seawater for gabions made of other materials. It can effectively avoid the construction damage caused by being crushed and damaged by the machine during the construction process.
Application Field of HDPE Geogrid Fabric
The geogrid fabric is suitable for roadbed reinforcement pavement reinforcement of various roads, railways and airports.
The HDPE geogrid fabric is suitable for foundation reinforcement of permanent load such as large parking lots and dock yards.
The HDPE geogrid fabric is suitable for slope protection of railways and highways.
The HDPE geogrid fabric is suitable for the secondary reinforcement of the soil slope reinforced by the one-way tensile geogrid to further strengthen the soil slope and prevent soil erosion.
Geogrid is suitable for various embankments and roadbed reinforcement, slope protection, and tunnel wall reinforcement. Large-scale airports, parking lots, dock freight yards and other permanent bearing foundation reinforcement.
Geogrid is used to increase the bearing capacity of the road (ground) foundation and prolong the service life of the road (ground) foundation.
Geogrid is used to prevent the road (ground) surface from collapsing or cracking, and keep the ground beautiful and tidy.
Geogrid is used for convenient construction, saving time and effort, shortening the construction period and reducing maintenance costs.
The successful application of geogrid is expected to reduce various embankment diseases common in high-intensity earthquake areas and improve the earthquake resistance and disaster reduction ability of roads. However, the current seismic design codes for highways and railways have not made corresponding provisions on the seismic performance of geogrid-reinforced embankments.
Construction site. It is required to be compacted flat, horizontal, and clear of spikes.
Grid laying. On a flat and compacted site, the main force direction (longitudinal) of the installed grid should be perpendicular to the axis direction of the embankment, and the laying should be smooth, without wrinkles, and as tight as possible. It should be fixed by inserting nails and earth-rock weight. The main stress direction of the grid should be full length without joints. The connection between the panels can be manually tied and overlapped, and the width of the overlap is not less than 10cm. If there are more than two layers of grilles, the layers should be staggered. After a large area is laid, the straightness should be adjusted as a whole. After filling a layer of soil, before rolling, the grille should be tightened manually or with equipment again, and the strength should be uniform, so that the grille is in a straight and stressed state in the soil.
Selection of fillers. Fillers should be selected according to design requirements. Practice has proved that except frozen soil, swamp soil, domestic garbage, chalk soil, diatomaceous earth can be used as filler. However, gravel soil and sand soil have stable mechanical properties and are less affected by water content, so they should be preferred. The particle size of the filler should not be greater than 15cm, and the gradation of the filler should be controlled to ensure the compaction weight.
Paving and compaction of filler. After the grid is laid and positioned, it should be filled with soil in time, and the exposure time should not exceed 48 hours. The flow operation method of backfilling while laying can also be adopted. First spread the filler on both ends, fix the grille, and then push it to the middle. The order of rolling is first on both sides and then in the middle. When rolling, the pressure roller cannot directly contact the reinforcement, and the uncompacted reinforced body generally does not allow vehicles to drive on it, so as to avoid the dislocation of the reinforcement. The layered compaction is 20-30cm. The degree of compaction must meet the design requirements, which is also the key to the success of reinforced soil engineering.
Waterproof and drainage measures: In reinforced soil engineering, drainage treatment must be done inside and outside the wall; foot protection should be done to prevent scouring; filtering and drainage measures should be set in the soil body. tube (or blind ditch). Drain the water by means of dredging, and can not be blocked, otherwise there will be hidden dangers.
Specification of Biaxial Geogrid Fabric for Road Stabilization Project in Thailand
- Total quantity – 5,8000 square meters
- Biaxial Geogrid Fabric Specification – 60kN-60kN
- Each roll size – 95m*50m
About BPM
BPM manufactures and supplies many types of effective and state of the art geogrid, geomembrane, geotextile, and geosynthetics to over 36 countries. Our main innovative, high quality geogrid products include plastic biaxial geogrid, fiberglass geogrid, plastic uniaxial geogrid, warp knitting polyester geogrid, and steel plastic georgic mesh, etc. BPM brand brand high quality geosynthetic products had been certificated by the ISO9001, ISO14001,OHSAS18001 Soncap, SASO and BV, SGS and Intertek, etc.
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