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Geocell Basic Principles
Oct 27, 2017

Geocell has the effect of excellence and attention by the engineering community, but also from its basic principles. In the foreign literature, when it describes its principle, it is called "a honeycomb-like three-dimensional limiting system that can significantly improve the performance of ordinary fillers in load and worm control applications." The key principle is that the three- The We all know that when the car driving in the desert, it will press out two deep rut, the pressure part of the deep subsidence, rut on both sides will be high uplift. The rear of the vehicle will continue to sink along the rut, and the subsidence will sink further, and the uplift will be further raised until the uplift is rubbed into the car chassis, and the trailing rut buried more than half of the wheels and can not move forward. The reason why this is so, because when the external load on the surface of the foundation, according to Prandelli theory and Taylor theory we can see: under the action of concentrated load, the active area 1 pressure subsidence, and the force to the two sides of the decomposition to Transition zone 2, over-zone 2 and pass to the passive zone 3, the passive area will be unrestricted deformation and uplift.


Features:


1, stretching freely, transport can be folded, the construction can be pulled into a mesh, fill the soil, gravel, concrete and other loose materials, constitute a strong lateral and large stiffness of the structure.


2, light material, wear resistance, chemical stability, light aging resistance, acid and alkali, suitable for different soil and desert and other soil conditions. 3, the higher lateral restrictions and anti-skid, anti-deformation, and effectively enhance the carrying capacity of subgrade and distributed load. 4, to change the geocell height, welding distance and other geometric dimensions to meet the needs of different projects. 5, stretching freely, transport small size, easy connection, construction speed. In other words, once the load acts on the roadbed, under the load will form a sign of the active area, it is through the transition area to squeeze, so that the passive area of the uplift. That is, the load carrying capacity of the foundation is determined by the force of the three regions of the transition, the passive, the transition and the passive three regions. Not only in the sand base can be very obvious to understand the above principles of the real process, in the soft ground road will find this kind of model, but its formation rate than the change in the sand slower. Even if the better roadbed materials still can not avoid its lateral movement. The general highway subgrade is several meters above the ground, water is not easy to fouling, but long-term settlement still exists. The reason why the rainwater infiltration, material loss, base sinking is part of the reason, the roadbed in the wheel load under the long-term rolling, vibration force, the material to the road section on both sides of the horizontal displacement is undeniable is another very important reason The To all levels of roads around the province, for example, have the main lane in the road can be clearly felt the road has been pressed out of a "S" type groove belt. Part of the highway is no exception, the car driving in the traffic lane on the bumpy strong driving in the trolley on the feeling, especially in the bridge connecting section (commonly known as "bridge jumping"). This kind of gully-type roadbed settlement is typical of subgrade material lateral slip.


The purpose of routine treatment of subgrade in engineering is not to be described. The purpose is to improve the shear and friction of the foundation material, reduce or delay the ability of the foundation material to move under the pressure or vibration of the load. Therefore, the requirements of the material in the project must be There are many harsh restrictions, if you can not get the necessary materials, you need to outsource these materials, the cost of purchasing materials and transportation costs accounted for a large part of the entire project cost. And the use of geocells can be local or near the material, and even can be used in the conventional case can not use the material, thereby significantly reducing the cost of materials purchase and transportation costs. Why is it so? Geocell carrying conditions indicate that under active load, the active zone 1 will still transmit the force to the transition zone 2, but due to the lateral confinement of the cell walls and the adjacent lattice The lateral reaction force of the transition zone 2 and the passive zone 3 is suppressed, and the load carrying capacity of the subgrade is improved. After the test, under the constraints of the cell, the apparent cohesion of the sand can be increased by thirty times. Obviously, if you can increase the resistance of the roadbed material or inhibit the three regional movement can be achieved to improve the bearing capacity of the foundation effect, which is geocell limits. Geocell chamber as a new type of synthetic materials, in the late eighties and early nineties, Europe and the United States and other countries began a lot of research and development work, and by the trial and field applications to prove that in general to enhance the load to withstand dynamic load and roadbed protection Aspects are very effective. China in the early nineties in the absorption of foreign advanced experience on the basis of the beginning of the geocell room development research work, and in the roadbed bed disease remediation, fixed loose media application has made a major breakthrough. With the further understanding of the geocell characteristics, it has been found that it has other geotechnical materials (geotextile, geomembrane, geogrid, geogrid, geotextile, etc.) irreplaceable advantages, so that in many areas have a unique Application prospects.