Abstract
Steel-plastic geogrid greatly improves the stability of surrounding rock in the supporting project due to the qualities, such as high strength, high toughness and less creep deformation. Through the geogrid mechanical properties analysis, tensile strength, deformation and creep test and field experiment and so on, we researched and analyzed steel-plastic geogrids’ characteristics and supporting effect, and concluded the influencing factors of steel-plastic geogrids’ characteristics, load-time curve and the steel-plastic geogrids’ variation under different temperature. We explained steel-plastic geogrids’ supporting effect through specific examples of projects. The results of the studies are listed as follows: (1) Steel-plastic geogrid has good resistance to deformation and node failure of roadway surrounding rock deformation, which has good tensile property, creep property and deflection performance; (2) It is feasible to support the surrounding rock by forming a whole combined joint support with steel- plastic geogrid and high-strength prestressed anchor rod.
Highlights
With the advantages of high strength, good durability, convenient construction, geogrid has been widely used in highway, railway, mine and other fields
Almost no one is involved in the application of the steel plastic geogrid as anchor net support
Steel-plastic geogrid was applied successfully in roadway, and it was verified that the steel-plastic geogrids could replace metal mesh to support in roadway
Summary
With the advantages of high strength, good durability, convenient construction, geogrid has been widely used in highway, railway, mine and other fields When it is applied as supporting structure, geogrid mainly through its tensile strength to bear the load from the soil plays a role of the project. The construction method of flexible support and active support method, the soft rock roadway has a certain guiding significance, has been widely used in the design and construction of underground engineering Based on the classical elastic-plastic theory of surrounding rock, many scholars have carried out a lot of research and improvement in the domestic and international [2, 3]. We know that there are almost no researches of the steel-plastic geogrids as the anchor of the supporting mechanism and method. Steel-plastic geogrid was applied successfully in roadway, and it was verified that the steel-plastic geogrids could replace metal mesh to support in roadway
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