中文摘要：

筋土之间的相互作用机制复杂,是土工合成材料加筋加固应用中的核心问题。通过室内拉拔试验,研究了土工格栅与砂土相互作用机制和格栅几何特征对拉拔阻力的影响。初步揭示了格栅横肋和纵肋在拉拔模式下的作用机制和格栅网格刚度对拉拔阻力的影响。结果表明,在拉拔位移较小时,纵肋摩阻力和横肋被动阻力几乎同步增长;在拉拔位移较大时,纵肋摩阻力逐步达到峰值,拉拔力的增量大部分来源于被动阻力的进一步增长。土工格栅拉伸模量和网格刚度是影响筋土界面力学特性的重要因素。

英文摘要：

The complicated mechanism of interaction between soils and reinforcement is the key problem in the application of geosynthetic reinforced soil engineering.Through laboratory pull-out tests,the mechanism of interaction between sand and geogrid and the factors of grid metric features influencing the pull-out resistance have been explored.This research work tentatively reveals the action mechanism of transverse ribs and longitude ribs and the influence of grid rigidity on the pull-out resistance.The results indicate that the interface friction of longitude ribs and the passive resistance of transverse ribs develop basically simultaneously when the pull-out displacement is small;while the displacement becomes larger,the longitude ribs＇ fricton reaches gradually the peak value,the increaseing of pull-out resistance is mostly attributed to the development of transverse ribs＇ resistance.The tensile modulus and the structure stiffness of geogrids are the important factors affecting the mechanical charateristics of interface between soils and reinforcement.