土工格栅在砂土中的界面摩擦特性

Characteristics of Interfacial Friction of Geogrids in Sand

以河北省邢汾高速公路加筋高填方路堤工程为背景,通过室内拉拔试验,研究不同类型的土工格栅在砂土中的界面摩擦特性作用。试验结果表明:随着上覆荷载的增加,土工格栅与砂土的摩擦特性加强,其中横肋的被动阻力在界面摩擦特性中起到主要作用。由于双向土工格栅的横肋比较多,网格与砂土的空间连锁作用较强,双向土工格栅的加筋效果要优于单向土工格栅的加筋效果。该试验结果为土工格栅加筋砂土路基稳定性研究提供参考,并为土工合成材料在类似工程中的应用提供参考。

Based on the geogrid reinforced high-embankment for Xingfen Highway of Hebei Province, characteristics of inter- facial friction of different geogrids in sand are researched through indoor pull out tests. The results show that, with the in- crease of cover load, sand-grogrid interracial friction increases with the passive resistance of transverse ribs playing a major role. Due to the multiple transverse ribs in biaxial geogrids, the geogrids produce strong interlocking with sand and biaxial geogrids produce better result than uniaxial geogrids. The test results provide a reference for the study of the stability of geogrid-reinforced sand embankment and the application of geosynthetics in similar projects.