Experimental Study of Tensile Properties of the Steel-plastic Geogrids

ABSTRACT

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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