不同网孔形状格栅加筋土界面特性试验研究  

Experimental Study of Interface Behavior of Geogrids with Different Aperture Shapes

作　　者：郑俊杰[1] 周燕君[1] 曹文昭[1] 赖汉江[1] 杨友彬 

机构地区：[1]华中科技大学岩土与地下工程研究所,湖北武汉430074

出　　处：《西南交通大学学报》2017年第3期482-488,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51278216;51478201)

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.In order to investigate the effect of aperture shape on the geogrid-soil interface behavior, tensile tests were conducted using two kinds of geogrids with triangular apertures and rectangular apertures, which are of similar aperture size and mechanical properties. The effect of aperture shape on the geogrid-soil interface behavior under different normal pressures and pullout test directions were analyzed in terms of the pullout resistance, shear strength of geogrid-soil interface, apparent friction coefficient and geogrid rib deformation. The results show that the geogrid with triangular apertures plays a better role than the geogrid with rectangular apertures in restraining the lateral displacement of soil. For the geogrid with triangular apertures, the peak values of friction angle in cases TX_0 and TX_90 were 48.20 and 38. 20, respectively, while the peak value of friction angle in case SS20 case was only 35. 9°. The flexural deformation of different degrees was observed in the horizontal and diagonal ribs of the geogrid with triangular apertures during the pullout test, while the ribs of the geogrid with rectangular apertures mainly presented a tensile deformation.

关 键 词：拉拔试验 网孔形状 筋土界面特性 土工格栅 

分 类 号：TU501[建筑科学—建筑技术科学]