拉伸速率对经编土工格栅拉伸特性的影响研究

Effect of Tensile Rate on Tensile Properties of Warp-knitted Geogrids

文章通过对4种不同强度的经编聚酯土工格栅开展室内单轴拉伸试验,研究了拉伸速率对其拉伸性能的影响。试验结果表明:在单轴拉伸过程中,拉伸速率对不同标称抗拉强度土工格栅的影响不同,但4种土工格栅的拉伸曲线具有相似性,说明土工格栅经纬向纱线的拉伸失效机制具有相似性,破坏时应变均在10%以上。随着拉伸速率的增大,土工格栅的拉伸强度增加,峰值应变减小,割线拉伸模量增大。试验结果对加筋结构内部力学机制的分析具有重要的参考价值。

In this paper,the effects of four tensile rates on the tensile properties of warp-knitted polyester geogrids were studied by conducting uniaxial tensile tests.The results show that the influence of tensile rates on the nominal strength of geocell is different in the process of uniaxial tension.But the tensile curves of the four geogrids are similar,indicating that the failure mechanism of geogrid warp and weft yarns is similar,and the strain at the time of failure is all above 10%.As the tensile rate increases,the tensile strength of the geogrid grows;the peak strain decreases;the secant tensile modulus increases.The test results provide an important reference for the analysis of the internal mechanical mechanism of the reinforced structure.