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中文摘要：
筋材与土体接触面的相互作用较为复杂,它是加筋土工程设计中的关键所在。为了研究筋土界面的作用机制,采用福建标准砂与玻璃纤维土工格栅进行了一系列室内大型直剪试验,较为系统地分析了格栅横肋与纵肋及格栅几何尺寸对于筋土界面强度特性的影响。试验结果表明,格栅的横肋与纵肋在界面强度中均发挥了较大的作用,两者表现为不同的作用机制,当剪切位移较小时格栅横肋的被动阻力和纵肋的摩阻力起到共同承担荷载的作用;随着剪切位移的增大,横肋的被动阻力进一步提升,纵肋发挥了较为显著的提高筋材刚度的框架作用。因此,格栅的纵横肋需要按合理比例搭配才能发挥出较大的筋土界面强度。
英文摘要：
The interaction mechanism of geosynthetics-soil interface is complicated and also important for designing the geosynthetics reinforced structure. A series of large scale direct shear tests, using Fujian standard sand and Fiberglass geogrid, are used to investigate the influence of longitudinal and transverse ribs and aperture pattern on the interface shear behavior of soil against geosynthetics. The test results show that both the longitudinal and transverse ribs play an important role in improving the interface strength through different courses of action. The shear force of interface will be shared by passive resistance of transverse ribs and friction resistance of longitudinal ribs when shear displacement is small; while the longitudinal ribs present the role of framework to improve the geogrid stiffness with the increasing of transverse resistance due to the shear displacement increasing. Therefore, coordinate work of longitudinal and transverse ribs will help to advance the interface shear strength.
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