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Honeycomb cell

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Honeycomb cell

更新时间:2019-05-20 点击数:77

Geocell

Geotechnical cell is a three-dimensional mesh cell structure formed by high strength welding of reinforced HDPE sheets. Usually by ultrasonic needle welding. Because of Engineering needs, some holes are drilled on the diaphragm.

Characteristic

1. It is flexible and can be transported and stacked. During construction, it can be stretched into a net and filled with loose materials such as soil, gravel, concrete, etc. to form a structure with strong lateral restriction and large stiffness.

2. Light material, wear resistance, stable chemical performance, light and oxygen aging resistance, acid and alkali resistance, suitable for different soil and desert and other soil conditions.

3. Higher lateral restraint and anti-skid, anti-deformation and effective enhancement of subgrade bearing capacity and decentralized load.

4. Geotechnical dimensions such as height of geocell and welding distance can meet different engineering needs.

5. Flexibility, small transport volume, convenient connection and fast construction speed.

Basic principles

Geotechnical compartments have attracted the attention of engineering circles because of their outstanding effects. It should also start with their basic principles. When describing its principle in foreign literature, it is called "a three-dimensional honeycomb restriction system, which can significantly improve the performance of ordinary filling materials in load-bearing and insect erosion control applications in a large range." Its key principle is three-dimensional restriction. As we all know, when a car is driving in the desert, it will press out two deep ruts, the pressed part will sink deeply, and the two sides of the rut will rise high. If the vehicle behind continues to move along the rut, the subsidence part will sink further and the uplift part will rise further until the uplift part rubs against the chassis, and the subsided rut buries most of the wheels, thus unable to move forward. The reason is that when the external load acts on the surface of the foundation, according to Planter's theory and Taylor's theory, the active zone 1 is subjected to compression and subsidence under concentrated load, and the force is decomposed to the two sides of the transition zone 2, and the transitional zone 2 to the passive zone 3. The passive zone will rise and deform unconstrainedly.

Product characteristics:

1. Flexibility, transport can be folded, construction can be stretched into a network, filled with soil, gravel, concrete and other loose materials, to form a strong lateral constraints and stiffness of the structure.

2. Light material, abrasion resistance, chemical stability, light and oxygen aging resistance, acid and alkali resistance, suitable for different soil and desert and other soil conditions.

3. Higher lateral restraint and anti-skid, anti-deformation and effective enhancement of subgrade bearing capacity and decentralized load.

4. Geotechnical dimensions such as height of geocell and welding distance can meet different engineering needs.

5. Flexibility, small transport volume, convenient connection and fast construction speed. That is to say, once the load acts on the roadbed, the active area will be formed beneath the load, and then it will be extruded through the transition area, so that the passive area will uplift. That is to say, the bearing capacity of the foundation is determined by the shear forces along the slip line and the forces in the active, transitional and passive regions. Not only can we clearly understand the true process of the above principle on the sand base, but we can also find this kind of model on the soft foundation highway, but the rate of its formation is slower than that on the sand. Even better subgrade materials can not avoid its lateral movement. Generally, the roadbed of expressway is several meters higher than the ground. It is not easy to pour water into the ground, but the long-term settlement still exists. Rainwater infiltration, material loss and base sinking are some of the reasons. Under the action of long-term rolling and vibration of wheel load, lateral displacement of material to both sides of subgrade section is undeniably another very important reason. Taking highways at all levels in our province as an example, we can clearly feel that the road has been pressed out of a "S" trench belt on the main lane of the road. Some expressways are no exception. The bump on the lane is obviously stronger than that on the overtaking belt, especially in the bridge-road connection section (commonly known as "bridge-head jump"). The settlement of ditch subgrade is a typical example of lateral slip of subgrade material.

There is no need to elaborate on the conventional methods of roadbed treatment in engineering. The purpose is to improve the shear and friction of foundation materials, reduce or delay the ability of foundation materials to move under the action of load or vibration. Therefore, there must be many stringent restrictions on the requirements of materials in engineering. If the required materials can not be obtained nearby, they need to be purchased and purchased. Costs and transportation costs account for a large part of the total cost of the project. Geotechnical cells can be used to obtain materials in situ or nearby, or even materials that cannot be used under normal conditions, thus greatly reducing the cost of material purchase and transportation. The load-bearing situation of geocell indicates that under concentrated load, the active zone 1 will still transfer the force to the transition zone 2, but the lateral resistance caused by the lateral restriction of the cell wall and the reaction force of adjacent cells, as well as the friction force between the filler and the cell wall, restrains the transverse movement tendency of the transition zone 2 and the passive zone 3, so as to make the roadbed move. The carrying capacity has been improved. The results show that the apparent cohesion of medium-density sand can be increased by more than 30 times under the confinement of cell. Obviously, if the shear resistance of subgrade material can be increased or the movement of three regions can be restrained, the effect of improving the bearing capacity of foundation can be achieved, which is the principle of geocell limitation. Geotechnical cell is a new type of synthetic material. In the late 1980s and early 1990s, a lot of research and development work began in Europe, America and other countries. It has been proved by test and field application that it has great effect in improving the dynamic load bearing capacity of general fill and roadbed protection. In the early 1990s, on the basis of absorbing the advanced experience of foreign countries, China began the research and development of geocell, and made great breakthroughs in the treatment of roadbed diseases and the application of fixed loose media. With the further understanding of the characteristics of geocell, it has been found that it has irreplaceable advantages of other geomaterials (geotextile, geomembrane, geogrid, geobag, geonet, etc.) and has unique application prospects in many fields.

engineering application

1. Treatment of semi-filled and semi-excavated roadbed

When building embankments on slopes with a natural gradient of 1:5 on the ground, the embankment foundation should dig steps. When the width of the steps is not less than 1M, the joint of the new and old embankment filling slopes should be excavated when the highway is widened by stages. The width of the high-grade highway steps is generally 2M. Geotechnical cells should be laid on the horizontal surface of each step, and the side limit of the geocell itself should be increased. The reinforcement effect can better solve the problem of uneven subsidence.

2. Roadbed in Sandstorm Area

The roadbed in windy sand area should be mainly low embankment, and the filling height is not less than 0.3M. Because of the special requirements of low roadbed and heavy load-bearing in windy sand area, the use of geocell can play a side-limiting role in loose filling, and ensure that the roadbed has high stiffness and strength in a limited height to withstand the load stress of large vehicles.

3. Reinforcement of abutment backfill

Geotechnical compartment can better achieve the purpose of reinforcing abutment back. It can produce enough friction between geocell and filler, effectively reduce the uneven settlement between subgrade and structure, and ultimately effectively alleviate the early impact damage of "abutment jumping" disease on bridge deck.

4. Roadbed in Permafrost Area

In permafrost regions, the filling roadbed should reach the minimum filling height to prevent frost boiling or lowering the upper limit of the frozen layer, resulting in excessive settlement of the embankment. The unique vertical reinforcement effect of geocell and the effective implementation of the overall lateral limit can ensure the minimum filling height in some special areas to the greatest extent, and make the filling have high quality strength and stiffness.

5. Treatment of collapsible loess roadbed

When Expressway and first-class highway pass collapsible loess and loess section with better compressibility, or when the allowable bearing capacity of high embankment is lower than the pressure of vehicle's cooperative load and embankment's dead weight, the subgrade should also be treated according to the bearing capacity requirement, then the advantages of geocell will undoubtedly be revealed.

6. Saline soil and expansive soil

Highway, first-class highway, shoulder and slope constructed with saline soil and expansive soil all adopt reinforcement measures. The reinforcement effect of the elevation of the cell is the best of all reinforcement materials, and it has excellent corrosion resistance and can fully meet the requirements of constructing highway in saline soil and expansive soil.

Component

Geotechnical cell is a network cell structure formed by high strength HDPE or PP copolymer broadband through strong welding or riveting. It is flexible, can be folded up when transported, opened and filled with earth, stone or concrete material when used, forming a structure with strong lateral restriction and large stiffness. It can be used as cushion to deal with soft foundation and increase the bearing capacity of foundation. It can also be laid on the slope surface to form a slope protection structure. It can also be used to build a retaining structure and so on.

Main uses

1. Used for stabilizing roadbed of highway and railway.

2. Embankment and shallow river regulation for bearing gravity.

3. Mixed retaining wall for preventing landslide and loading gravity.

4. When encountering soft foundation, the use of geocell can greatly reduce the construction labor intensity, reduce the thickness of subgrade construction speed, good performance, and greatly reduce the cost of construction.


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