中文摘要：

为了研究土工格栅的筋土界面作用特性与受力变形特征,利用自行研发的土工合成材料拉拔试验装置,对土工格栅进行不同竖向荷载的室内拉拔试验,分析格栅不同嵌固长度处的位移及应变特性,以揭示筋土相互作用的受力机理。结果表明,随着拉拔力的增加,土中格栅受力沿着嵌固长度方向发展,格栅前部分的应变持续明显增大;拉拔力沿格栅嵌固长度对周围土体的影响减少减弱,格栅嵌固长度越大,其相对位移与格栅应变越小;随着竖向荷载的增加,土工格栅的应变总趋势是变小;在拉拔力相对较小时,25 kPa、50 kPa和75 kPa竖向荷载作用下格栅应变发展趋势相近,但随着拉拔力的变大,格栅受到土体摩擦力沿嵌固长度扩展,嵌固长度越大格栅后半段变形越少,末段格栅受力越小。

英文摘要：

In order to study the deformation of soil reinforcement geogrid and the interaction between soil and geogird,a self-developed geosynthetic pullout test device was used for the pull-out test under different indoor vertical loads to analyze the displacement and strain characteristics corresponding to different embedded lengths. The results show that with the increase of geogrid pullout force,the stress of geogrid along the direction of geogrid longitudinal depth develop,and the strain at the front part of geogrid continue to increase obviously. The pullout force in the surrounding soil is reduced and weakened along the direction of longitudinal depth of geogrid,and the relative displacement and strain of the geogrid is small. With the increase of vertical load,the general trend of geogrid strain is smaller. When the pullout force is relatively small,the development trend of geogrid strain under25 kPa,50 kPa and 75 kPa vertical loads is similar. But with the increase of pullout force,the friction between geogrid and soil along the longitudinal depth expands. The greater the longitudinaldepth is,the fewer the latter part of grid deformation and the smaller the stress of end of grid are.