Application of geocells in embankments

As a new type of synthetic material, geocells have been researched and developed in Europe and the United States in the late 1990s. Its on-site application has great effect in improving the dynamic load bearing capacity of backfill soil and roadbed protection. In the early 1990s, on the basis of absorbing advanced foreign experience, my country began to develop and research geocells, and made major breakthroughs in the treatment of road bed diseases and the application of fixed loose media. After 2000, geogrids also appeared in slope protection of water conservancy projects. 

The use of geocell vegetation slope protection is a composite ecological slope protection formed by combining geocells with plants. The honeycomb structure of geogrids can plant vegetation. The soil is fixed on the slope, providing necessary soil and nutrients for plant growth, forming green plant slope protection. The vegetation stems and leaves prevent rainfall from directly washing the slope surface, reducing the impact energy of raindrops. At the same time, the plant roots can solidify the soil and protect the slope.

In order to facilitate quality control during construction and clarify quality control standards, combined with the design purpose of this project and the actual construction site, we first clarify the technical indicators of the project and clarify the key points of quality management in the project. The first is that the material indicators of the geocell must meet the design requirements. It is easy to ignore indicators such as water permeability, welding strength and component connection aperture. In order to find a suitable manufacturer, the construction unit consults multiple manufacturers and tests the samples. Only then determine the purchasing unit. The second is to determine the important links in the construction. 

According to the characteristics of the geocell, the key content of the construction is the connection of the professional limiters of the geocell. The steel bars must be anchored into the embankment perpendicular to the embankment slope, and the anchorage of the steel bars must be increased. force to ensure that the geocell can be stable under flood impact, and at the same time ensure that there is at least one fixed anchoring steel bar per square meter. Refer to the design of the traction cables of the geotechnical gabion net, and use a plum blossom arrangement to distribute the anchoring force more evenly. The entire geocell of the department. Third, there is the problem of the connection between the cells and the gabion feet. The connection method between the geocell and the gabion feet was not specified in the design. 

Based on the construction site, the geocell can be directly connected to the gabion feet with iron wires to ensure that the geogrid The integrity of the geocell and the gabion foot protection increases the erosion resistance of the geocell. Fourth, formulate a geocell quality assessment form to clarify the quality control indicators during construction and provide a basis for construction and quality management. The slope ratio of this project is large and the slope is gentle. The geocells mainly play the role of solidifying the soil and resisting erosion. After the plants grow up, the plant slope protection root system and the geocell form an integral anti-scouring slope protection system. According to the design technical indicators and control indicators that affect the quality of geocells, and with reference to the quality assessment form of Geotextiles, a geocell quality assessment form is formulated.

The success of the geocell and plant slope protection system of this project can be summarized in three aspects: First, consult a large number of cases and specifications about geocell construction before construction. In the absence of specific construction specifications, refer to many similar cases. Based on the construction experience of the project, we will formulate a construction plan for this project and clarify the key links and technical indicators of the project construction; secondly, strictly control the management of incoming materials and the quality management of the construction process, and construct in strict accordance with technical standards; thirdly, Timely adjust construction methods, improve construction technology, and ensure construction quality if problems arise on site. However, some shortcomings were also found. For example, the erosion resistance of geocells is relatively poor. Geocells have been washed away in some dangerous river sections and the contact areas of barrages. In future construction, the erosion resistance of geocells should be strengthened. Protect serious areas or use other methods such as gabion masonry.