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Geocells Is Applied To The Basic Principle Of Highway Construction



Geocells is applied to the basic principle of highway construction

Geocells' remarkable efficacy has attracted the attention of the engineering community, and it should start with its basic principles. In the foreign literature in describing the principle that it is "a kind of honeycomb three dimensional limitation system, can significantly higher in a wide range of common filler material in the bearing and control performance of the application of insect damage." Its key principle is the three-dimensional limit. As you know, when the car is running on the desert, it will press out two deep grooves, Geocells the pressure part will sink deeply, the ruts will be raised on both sides. At the back of the vehicle if continues to move along the furrow, subsidence sections will further subsidence and uplift will further uplift, until the bulge part onto car chassis, subsidence of rutting is neglected the better part of a wheel, thus unable to move forward. So, it is because when external load ACTS on the foundation surface, according to the prandtl's theory and Taylor theory shows: under the action of concentrated load, active zone 1 compression subsidence, and pass force decomposition to each side to transition zone 2, excessive area passive zone 2 and 3, passive area will be deformation and uplift without any restrictions. In other words, once the load has acted on the roadbed, it will form an active area under the load, and it will be squeezed through the transition zone, which will cause the passive region to rise. In other words, the bearing capacity of the foundation is determined by the force of the shear force along the slip line and the force of the moving, transition and passive regions. Not only on the sand base can obviously feel the real process of the above principle, Geocells the highway in the soft foundation can also find this model, its formation rate than only on the sand subgrade material changes slowly it even better and still can't avoid its lateral movement. The general highway subgrade is several meters above the ground, it is not easy to absorb water, but the long-term settlement still exists. Investigate its reason, the rain through, material loss, base sinking is part of the reason, roadbed in long-term rolling wheel load, under the action of vibration, material to the subgrade section on both sides of the horizontal displacement of the undeniable is another important reason.

The method of routine treatment of roadbed in engineering is not to be discussed. The aim is to improve the shear force and friction of foundation materials. To reduce or delay the pressure of foundation material in loading or vibration under the action of the ability to move, so there must be many demanding projects on the material limit, if can't obtain the required materials, nearby requires purchased these materials, the cost of purchased materials and transport costs take up a large part of the whole project cost. The use of Geocells can be used locally or nearby, and can even be used in materials that cannot be used under normal conditions, thereby significantly reducing the purchase and transportation costs of materials. Why is that? Geocells carrying case indicated: under the action of concentrated load, the stress of active zone 1 will still take the force transmission to the transition zone of 2, but as a result of lattice room wall lateral limit and the reaction of adjacent lattice room, and packing and lattice room wall formed by the friction of the lateral resistance, inhibiting the transition zone 2 and zone 3 passive lateral movement tendency, thus to improve the bearing capacity of the subgrade. After the experiment, under the restriction of the lattice, the apparent cohesion of mesodense sands can be increased by thirty times. Obviously, if you can increase the shear force of the subgrade material or inhibit the movement of the three regions, it can improve the bearing capacity of the foundation, which is the principle of the restriction of Geocells.

In most cases, such as indoor filling sand or gravel non-cohesive materials, therefore, Geocells reinforcing layer and a horizontal drainage channel, to speed up the gap in the process of water saturated soil consolidation pressure dissipation rate, so as to accelerate the consolidation of soil. In conclusion, Geocells have the comprehensive effect of bedding, reinforcement, drainage, adjusting stress and deformation, and improving the anti-seepage ability of soil.

Weak to effectively reinforce the railway bed, ensure the safety of train operation, using the Marc software to Geocells reinforcement engineering properties of foundation bed, the finite element analysis, and respectively selected 34 cm x 40 cm by 10 cm, to 10 cm, 34 cm x 40 cm x 15 cm and 1, 5 cm (welding distance x height) four specifications of Geocells, application of Geocells reinforcement plate load test methods for the bearing capacity of soft bed, full scale model test using Geocells reinforcement method at the same time, the YangAn railway K241 + 450 ~ 550 period of weak bed treatment. The results show that Geocells can effectively restrain weak bed lateral displacement and the stress diffusion, maximum lateral displacement can be reduced by 17%, the maximum vertical stress reduced by 9.3%, and the stress distribution more uniform; The base bed bearing capacity of the reinforcement is 180 kPa, and the reinforcement cost is reduced by 6% ~ 12%. The maximum settlement of 6 a in the reinforced lot is 28 mm and the minimum settlement is 13 mm, which is the purpose of reinforcing the weak bed of railway.

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