不同网孔形状格栅加筋土界面特性试验研究

发布时间：2018-06-13 07:54

本文选题：拉拔试验 + 网孔形状　；参考：《西南交通大学学报》2017年03期

【摘要】：为探讨土工格栅网孔形状对筋土界面特性的影响,选取网孔尺寸和力学特性相近的三角形网孔土工格栅和矩形网孔土工格栅进行了拉伸试验.基于拉拔阻力、筋土界面抗剪强度、界面表观摩擦系数及格栅肋条变形等参数的变化规律,对不同法向压力及拉拔方向工况下格栅网孔形状对筋土界面特性的影响进行对比分析,结果表明:三角形网孔土工格栅对砂土颗粒侧向位移的限制大于矩形网孔土工格栅;对于三角形网孔土工格栅,工况TX_0和工况TX_90的峰值摩擦角分别为48.2°和38.2°,矩形网孔土工格栅工况SS20的峰值摩擦角仅为35.9°;拉拔过程中,三角形网孔土工格栅的横向肋条和对角线肋条出现了不同程度的挠曲变形,矩形网孔土工格栅的肋条主要为纵肋拉伸变形.
[Abstract]:In order to investigate the influence of the shape of geogrid mesh on the interface characteristics of reinforced soil, the tensile tests were carried out with triangular and rectangular meshes with similar size and mechanical properties. Based on the parameters of drawing resistance, shear strength of reinforced soil interface, apparent friction coefficient of interface and deformation of grille rib, etc. The effects of the shape of grid holes on the interface characteristics of reinforced soil under different normal pressure and drawing direction are compared. The results show that the lateral displacement of sand particles is more limited by triangular mesh geogrid than that by rectangular mesh. For triangular mesh geogrid, the peak friction angles are 48.2 掳and 38.2 掳for working mode TXS0 and 38.2 掳for working mode TXS90, respectively, and only 35.9 掳for SS20 under rectangular grid, and 35.9 掳during drawing, respectively. The transverse ribs and diagonal ribs of triangular mesh geogrid show different degrees of flexural deformation, and the rib of rectangular mesh is mainly longitudinal rib tensile deformation.
【作者单位】：华中科技大学岩土与地下工程研究所;
【基金】：国家自然科学基金资助项目(51278216,51478201)
【分类号】：TU472

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