土工格栅不同速率拉伸性能试验

Experimental on different rate of geogrid tensile properties

为研究土工格栅在不同拉伸速率条件下的力学特性及其作用机理,通过对2种土工格栅进行不同拉伸速率条件下的拉伸性能试验,分析土工格栅的拉伸速率与强度、伸长率、变异系数和拉伸模量的关系.试验结果表明:土工格栅随拉伸速率的增加其2%、5%伸长率下强度和峰值强度都趋向于幂函数曲线;伸长率受速率影响并不显著;土工格栅拉伸模量随着拉伸速率的增加逐渐增大,但是达到80mm/min以后出现下降趋势.

In order to research the geogrid mechanical characteristics and its mechanism under the condition of different tensile rates,through two kinds of geogrid on the tensile properties of different tensile rate test,this paper analyzed the relationship of geogrid tensile rate and strength, geogrid tensile rate and elongation, geogrid tensile rate and variation coefficient, geogrid tensile rate and tensile modulus. The experimental results show that geogrid along with the increase of stretching rate 2% and 5%, the elongation strength and peak strength tend to power function curve; Elongation rate influence is not obvious; Geogrid tensile modulus increas with the increasing of stretching rate gradually, but after 80 mm/min, the decline in the trend appears.