Abstract:Tensile strength is an important indicator of the steel-plastic geogrid mechanical properties. Tensile strength directly affects the size of the steel geogrid security and stability in support of the project. Stretching through the indoor geogrid test for combinations of different sizes and different geogrid elongation rate, tensile strength of the geogrid were compared. The findings are as follows: (1)The size of the stretching rate has a significant effect on the tensile properties of steel-plastic geogrid. The strain is constant, the stretching rate, the lower the tensile strength of the geogrid; stretching rate is constant, the greater the strain Plastic geogrid, the greater the tensile strength;(2) Peak strain increases with extension rates decrease; higher tensile strength material to reduce the amplitude of the smaller; under the same conditions of stretch rate, the lower the tensile strength of the geogrid, the higher the peak strain;(3)Different effects under different specifications geogrid tensile rate, steel-plastic geogrid degree of influence by the stretching rate is less than the plastic geogrid.
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.
As a kind of supporting material applied to the supporting structure, steel-plastic geogrid mainly goes through
the tensile strength to bear the load from the rock mass. Tensile strength is an important indicator of the steel-plastic
geogrid mechanical properties. Tensile strength directly affects the security and stability of the steel geogrid in support of
the project. Through the test of indoor geogrid stretching which combines different sizes' geogrids with different
elongation rates, tensile strengths of these geogrids were compared. The findings are as follows: (1) The stretching rate
has a significant effect on the tensile property of steel-plastic geogrid. When the strain is constant, the higher the
stretching rate is, the lower the tensile strength of the geogrid will be. When the stretching rate is constant, the greater the
strain plastic geogrid is, the greater the tensile strength will be; (2) The peak degree always decreases with the extension
rates' increase; a higher tensile strength material means a smaller reducing amplitude; under the conditions of the same
stretch rate, the lower the tensile strength of the geogrid is, the higher the peak strain will be; (3)The influences on
different geogrids vary when the tensile rates are different. Steel-plastic geogrid get less influenced by the stretching
rate than the plastic geogrid.
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